LCOV - code coverage report
Current view: top level - src/bin/pg_dump - parallel.c (source / functions) Hit Total Coverage
Test: PostgreSQL 15devel Lines: 267 325 82.2 %
Date: 2021-12-09 03:08:47 Functions: 29 32 90.6 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * parallel.c
       4             :  *
       5             :  *  Parallel support for pg_dump and pg_restore
       6             :  *
       7             :  * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
       8             :  * Portions Copyright (c) 1994, Regents of the University of California
       9             :  *
      10             :  * IDENTIFICATION
      11             :  *      src/bin/pg_dump/parallel.c
      12             :  *
      13             :  *-------------------------------------------------------------------------
      14             :  */
      15             : 
      16             : /*
      17             :  * Parallel operation works like this:
      18             :  *
      19             :  * The original, leader process calls ParallelBackupStart(), which forks off
      20             :  * the desired number of worker processes, which each enter WaitForCommands().
      21             :  *
      22             :  * The leader process dispatches an individual work item to one of the worker
      23             :  * processes in DispatchJobForTocEntry().  We send a command string such as
      24             :  * "DUMP 1234" or "RESTORE 1234", where 1234 is the TocEntry ID.
      25             :  * The worker process receives and decodes the command and passes it to the
      26             :  * routine pointed to by AH->WorkerJobDumpPtr or AH->WorkerJobRestorePtr,
      27             :  * which are routines of the current archive format.  That routine performs
      28             :  * the required action (dump or restore) and returns an integer status code.
      29             :  * This is passed back to the leader where we pass it to the
      30             :  * ParallelCompletionPtr callback function that was passed to
      31             :  * DispatchJobForTocEntry().  The callback function does state updating
      32             :  * for the leader control logic in pg_backup_archiver.c.
      33             :  *
      34             :  * In principle additional archive-format-specific information might be needed
      35             :  * in commands or worker status responses, but so far that hasn't proved
      36             :  * necessary, since workers have full copies of the ArchiveHandle/TocEntry
      37             :  * data structures.  Remember that we have forked off the workers only after
      38             :  * we have read in the catalog.  That's why our worker processes can also
      39             :  * access the catalog information.  (In the Windows case, the workers are
      40             :  * threads in the same process.  To avoid problems, they work with cloned
      41             :  * copies of the Archive data structure; see RunWorker().)
      42             :  *
      43             :  * In the leader process, the workerStatus field for each worker has one of
      44             :  * the following values:
      45             :  *      WRKR_NOT_STARTED: we've not yet forked this worker
      46             :  *      WRKR_IDLE: it's waiting for a command
      47             :  *      WRKR_WORKING: it's working on a command
      48             :  *      WRKR_TERMINATED: process ended
      49             :  * The pstate->te[] entry for each worker is valid when it's in WRKR_WORKING
      50             :  * state, and must be NULL in other states.
      51             :  */
      52             : 
      53             : #include "postgres_fe.h"
      54             : 
      55             : #ifndef WIN32
      56             : #include <sys/wait.h>
      57             : #include <signal.h>
      58             : #include <unistd.h>
      59             : #include <fcntl.h>
      60             : #endif
      61             : #ifdef HAVE_SYS_SELECT_H
      62             : #include <sys/select.h>
      63             : #endif
      64             : 
      65             : #include "fe_utils/string_utils.h"
      66             : #include "parallel.h"
      67             : #include "pg_backup_utils.h"
      68             : #include "port/pg_bswap.h"
      69             : 
      70             : /* Mnemonic macros for indexing the fd array returned by pipe(2) */
      71             : #define PIPE_READ                           0
      72             : #define PIPE_WRITE                          1
      73             : 
      74             : #define NO_SLOT (-1)            /* Failure result for GetIdleWorker() */
      75             : 
      76             : /* Worker process statuses */
      77             : typedef enum
      78             : {
      79             :     WRKR_NOT_STARTED = 0,
      80             :     WRKR_IDLE,
      81             :     WRKR_WORKING,
      82             :     WRKR_TERMINATED
      83             : } T_WorkerStatus;
      84             : 
      85             : #define WORKER_IS_RUNNING(workerStatus) \
      86             :     ((workerStatus) == WRKR_IDLE || (workerStatus) == WRKR_WORKING)
      87             : 
      88             : /*
      89             :  * Private per-parallel-worker state (typedef for this is in parallel.h).
      90             :  *
      91             :  * Much of this is valid only in the leader process (or, on Windows, should
      92             :  * be touched only by the leader thread).  But the AH field should be touched
      93             :  * only by workers.  The pipe descriptors are valid everywhere.
      94             :  */
      95             : struct ParallelSlot
      96             : {
      97             :     T_WorkerStatus workerStatus;    /* see enum above */
      98             : 
      99             :     /* These fields are valid if workerStatus == WRKR_WORKING: */
     100             :     ParallelCompletionPtr callback; /* function to call on completion */
     101             :     void       *callback_data;  /* passthrough data for it */
     102             : 
     103             :     ArchiveHandle *AH;          /* Archive data worker is using */
     104             : 
     105             :     int         pipeRead;       /* leader's end of the pipes */
     106             :     int         pipeWrite;
     107             :     int         pipeRevRead;    /* child's end of the pipes */
     108             :     int         pipeRevWrite;
     109             : 
     110             :     /* Child process/thread identity info: */
     111             : #ifdef WIN32
     112             :     uintptr_t   hThread;
     113             :     unsigned int threadId;
     114             : #else
     115             :     pid_t       pid;
     116             : #endif
     117             : };
     118             : 
     119             : #ifdef WIN32
     120             : 
     121             : /*
     122             :  * Structure to hold info passed by _beginthreadex() to the function it calls
     123             :  * via its single allowed argument.
     124             :  */
     125             : typedef struct
     126             : {
     127             :     ArchiveHandle *AH;          /* leader database connection */
     128             :     ParallelSlot *slot;         /* this worker's parallel slot */
     129             : } WorkerInfo;
     130             : 
     131             : /* Windows implementation of pipe access */
     132             : static int  pgpipe(int handles[2]);
     133             : #define piperead(a,b,c)     recv(a,b,c,0)
     134             : #define pipewrite(a,b,c)    send(a,b,c,0)
     135             : 
     136             : #else                           /* !WIN32 */
     137             : 
     138             : /* Non-Windows implementation of pipe access */
     139             : #define pgpipe(a)           pipe(a)
     140             : #define piperead(a,b,c)     read(a,b,c)
     141             : #define pipewrite(a,b,c)    write(a,b,c)
     142             : 
     143             : #endif                          /* WIN32 */
     144             : 
     145             : /*
     146             :  * State info for archive_close_connection() shutdown callback.
     147             :  */
     148             : typedef struct ShutdownInformation
     149             : {
     150             :     ParallelState *pstate;
     151             :     Archive    *AHX;
     152             : } ShutdownInformation;
     153             : 
     154             : static ShutdownInformation shutdown_info;
     155             : 
     156             : /*
     157             :  * State info for signal handling.
     158             :  * We assume signal_info initializes to zeroes.
     159             :  *
     160             :  * On Unix, myAH is the leader DB connection in the leader process, and the
     161             :  * worker's own connection in worker processes.  On Windows, we have only one
     162             :  * instance of signal_info, so myAH is the leader connection and the worker
     163             :  * connections must be dug out of pstate->parallelSlot[].
     164             :  */
     165             : typedef struct DumpSignalInformation
     166             : {
     167             :     ArchiveHandle *myAH;        /* database connection to issue cancel for */
     168             :     ParallelState *pstate;      /* parallel state, if any */
     169             :     bool        handler_set;    /* signal handler set up in this process? */
     170             : #ifndef WIN32
     171             :     bool        am_worker;      /* am I a worker process? */
     172             : #endif
     173             : } DumpSignalInformation;
     174             : 
     175             : static volatile DumpSignalInformation signal_info;
     176             : 
     177             : #ifdef WIN32
     178             : static CRITICAL_SECTION signal_info_lock;
     179             : #endif
     180             : 
     181             : /*
     182             :  * Write a simple string to stderr --- must be safe in a signal handler.
     183             :  * We ignore the write() result since there's not much we could do about it.
     184             :  * Certain compilers make that harder than it ought to be.
     185             :  */
     186             : #define write_stderr(str) \
     187             :     do { \
     188             :         const char *str_ = (str); \
     189             :         int     rc_; \
     190             :         rc_ = write(fileno(stderr), str_, strlen(str_)); \
     191             :         (void) rc_; \
     192             :     } while (0)
     193             : 
     194             : 
     195             : #ifdef WIN32
     196             : /* file-scope variables */
     197             : static DWORD tls_index;
     198             : 
     199             : /* globally visible variables (needed by exit_nicely) */
     200             : bool        parallel_init_done = false;
     201             : DWORD       mainThreadId;
     202             : #endif                          /* WIN32 */
     203             : 
     204             : /* Local function prototypes */
     205             : static ParallelSlot *GetMyPSlot(ParallelState *pstate);
     206             : static void archive_close_connection(int code, void *arg);
     207             : static void ShutdownWorkersHard(ParallelState *pstate);
     208             : static void WaitForTerminatingWorkers(ParallelState *pstate);
     209             : static void setup_cancel_handler(void);
     210             : static void set_cancel_pstate(ParallelState *pstate);
     211             : static void set_cancel_slot_archive(ParallelSlot *slot, ArchiveHandle *AH);
     212             : static void RunWorker(ArchiveHandle *AH, ParallelSlot *slot);
     213             : static int  GetIdleWorker(ParallelState *pstate);
     214             : static bool HasEveryWorkerTerminated(ParallelState *pstate);
     215             : static void lockTableForWorker(ArchiveHandle *AH, TocEntry *te);
     216             : static void WaitForCommands(ArchiveHandle *AH, int pipefd[2]);
     217             : static bool ListenToWorkers(ArchiveHandle *AH, ParallelState *pstate,
     218             :                             bool do_wait);
     219             : static char *getMessageFromLeader(int pipefd[2]);
     220             : static void sendMessageToLeader(int pipefd[2], const char *str);
     221             : static int  select_loop(int maxFd, fd_set *workerset);
     222             : static char *getMessageFromWorker(ParallelState *pstate,
     223             :                                   bool do_wait, int *worker);
     224             : static void sendMessageToWorker(ParallelState *pstate,
     225             :                                 int worker, const char *str);
     226             : static char *readMessageFromPipe(int fd);
     227             : 
     228             : #define messageStartsWith(msg, prefix) \
     229             :     (strncmp(msg, prefix, strlen(prefix)) == 0)
     230             : 
     231             : 
     232             : /*
     233             :  * Initialize parallel dump support --- should be called early in process
     234             :  * startup.  (Currently, this is called whether or not we intend parallel
     235             :  * activity.)
     236             :  */
     237             : void
     238         336 : init_parallel_dump_utils(void)
     239             : {
     240             : #ifdef WIN32
     241             :     if (!parallel_init_done)
     242             :     {
     243             :         WSADATA     wsaData;
     244             :         int         err;
     245             : 
     246             :         /* Prepare for threaded operation */
     247             :         tls_index = TlsAlloc();
     248             :         mainThreadId = GetCurrentThreadId();
     249             : 
     250             :         /* Initialize socket access */
     251             :         err = WSAStartup(MAKEWORD(2, 2), &wsaData);
     252             :         if (err != 0)
     253             :         {
     254             :             pg_log_error("%s() failed: error code %d", "WSAStartup", err);
     255             :             exit_nicely(1);
     256             :         }
     257             : 
     258             :         parallel_init_done = true;
     259             :     }
     260             : #endif
     261         336 : }
     262             : 
     263             : /*
     264             :  * Find the ParallelSlot for the current worker process or thread.
     265             :  *
     266             :  * Returns NULL if no matching slot is found (this implies we're the leader).
     267             :  */
     268             : static ParallelSlot *
     269           0 : GetMyPSlot(ParallelState *pstate)
     270             : {
     271             :     int         i;
     272             : 
     273           0 :     for (i = 0; i < pstate->numWorkers; i++)
     274             :     {
     275             : #ifdef WIN32
     276             :         if (pstate->parallelSlot[i].threadId == GetCurrentThreadId())
     277             : #else
     278           0 :         if (pstate->parallelSlot[i].pid == getpid())
     279             : #endif
     280           0 :             return &(pstate->parallelSlot[i]);
     281             :     }
     282             : 
     283           0 :     return NULL;
     284             : }
     285             : 
     286             : /*
     287             :  * A thread-local version of getLocalPQExpBuffer().
     288             :  *
     289             :  * Non-reentrant but reduces memory leakage: we'll consume one buffer per
     290             :  * thread, which is much better than one per fmtId/fmtQualifiedId call.
     291             :  */
     292             : #ifdef WIN32
     293             : static PQExpBuffer
     294             : getThreadLocalPQExpBuffer(void)
     295             : {
     296             :     /*
     297             :      * The Tls code goes awry if we use a static var, so we provide for both
     298             :      * static and auto, and omit any use of the static var when using Tls. We
     299             :      * rely on TlsGetValue() to return 0 if the value is not yet set.
     300             :      */
     301             :     static PQExpBuffer s_id_return = NULL;
     302             :     PQExpBuffer id_return;
     303             : 
     304             :     if (parallel_init_done)
     305             :         id_return = (PQExpBuffer) TlsGetValue(tls_index);
     306             :     else
     307             :         id_return = s_id_return;
     308             : 
     309             :     if (id_return)              /* first time through? */
     310             :     {
     311             :         /* same buffer, just wipe contents */
     312             :         resetPQExpBuffer(id_return);
     313             :     }
     314             :     else
     315             :     {
     316             :         /* new buffer */
     317             :         id_return = createPQExpBuffer();
     318             :         if (parallel_init_done)
     319             :             TlsSetValue(tls_index, id_return);
     320             :         else
     321             :             s_id_return = id_return;
     322             :     }
     323             : 
     324             :     return id_return;
     325             : }
     326             : #endif                          /* WIN32 */
     327             : 
     328             : /*
     329             :  * pg_dump and pg_restore call this to register the cleanup handler
     330             :  * as soon as they've created the ArchiveHandle.
     331             :  */
     332             : void
     333         230 : on_exit_close_archive(Archive *AHX)
     334             : {
     335         230 :     shutdown_info.AHX = AHX;
     336         230 :     on_exit_nicely(archive_close_connection, &shutdown_info);
     337         230 : }
     338             : 
     339             : /*
     340             :  * on_exit_nicely handler for shutting down database connections and
     341             :  * worker processes cleanly.
     342             :  */
     343             : static void
     344         194 : archive_close_connection(int code, void *arg)
     345             : {
     346         194 :     ShutdownInformation *si = (ShutdownInformation *) arg;
     347             : 
     348         194 :     if (si->pstate)
     349             :     {
     350             :         /* In parallel mode, must figure out who we are */
     351           0 :         ParallelSlot *slot = GetMyPSlot(si->pstate);
     352             : 
     353           0 :         if (!slot)
     354             :         {
     355             :             /*
     356             :              * We're the leader.  Forcibly shut down workers, then close our
     357             :              * own database connection, if any.
     358             :              */
     359           0 :             ShutdownWorkersHard(si->pstate);
     360             : 
     361           0 :             if (si->AHX)
     362           0 :                 DisconnectDatabase(si->AHX);
     363             :         }
     364             :         else
     365             :         {
     366             :             /*
     367             :              * We're a worker.  Shut down our own DB connection if any.  On
     368             :              * Windows, we also have to close our communication sockets, to
     369             :              * emulate what will happen on Unix when the worker process exits.
     370             :              * (Without this, if this is a premature exit, the leader would
     371             :              * fail to detect it because there would be no EOF condition on
     372             :              * the other end of the pipe.)
     373             :              */
     374           0 :             if (slot->AH)
     375           0 :                 DisconnectDatabase(&(slot->AH->public));
     376             : 
     377             : #ifdef WIN32
     378             :             closesocket(slot->pipeRevRead);
     379             :             closesocket(slot->pipeRevWrite);
     380             : #endif
     381             :         }
     382             :     }
     383             :     else
     384             :     {
     385             :         /* Non-parallel operation: just kill the leader DB connection */
     386         194 :         if (si->AHX)
     387         194 :             DisconnectDatabase(si->AHX);
     388             :     }
     389         194 : }
     390             : 
     391             : /*
     392             :  * Forcibly shut down any remaining workers, waiting for them to finish.
     393             :  *
     394             :  * Note that we don't expect to come here during normal exit (the workers
     395             :  * should be long gone, and the ParallelState too).  We're only here in a
     396             :  * fatal() situation, so intervening to cancel active commands is
     397             :  * appropriate.
     398             :  */
     399             : static void
     400           0 : ShutdownWorkersHard(ParallelState *pstate)
     401             : {
     402             :     int         i;
     403             : 
     404             :     /*
     405             :      * Close our write end of the sockets so that any workers waiting for
     406             :      * commands know they can exit.  (Note: some of the pipeWrite fields might
     407             :      * still be zero, if we failed to initialize all the workers.  Hence, just
     408             :      * ignore errors here.)
     409             :      */
     410           0 :     for (i = 0; i < pstate->numWorkers; i++)
     411           0 :         closesocket(pstate->parallelSlot[i].pipeWrite);
     412             : 
     413             :     /*
     414             :      * Force early termination of any commands currently in progress.
     415             :      */
     416             : #ifndef WIN32
     417             :     /* On non-Windows, send SIGTERM to each worker process. */
     418           0 :     for (i = 0; i < pstate->numWorkers; i++)
     419             :     {
     420           0 :         pid_t       pid = pstate->parallelSlot[i].pid;
     421             : 
     422           0 :         if (pid != 0)
     423           0 :             kill(pid, SIGTERM);
     424             :     }
     425             : #else
     426             : 
     427             :     /*
     428             :      * On Windows, send query cancels directly to the workers' backends.  Use
     429             :      * a critical section to ensure worker threads don't change state.
     430             :      */
     431             :     EnterCriticalSection(&signal_info_lock);
     432             :     for (i = 0; i < pstate->numWorkers; i++)
     433             :     {
     434             :         ArchiveHandle *AH = pstate->parallelSlot[i].AH;
     435             :         char        errbuf[1];
     436             : 
     437             :         if (AH != NULL && AH->connCancel != NULL)
     438             :             (void) PQcancel(AH->connCancel, errbuf, sizeof(errbuf));
     439             :     }
     440             :     LeaveCriticalSection(&signal_info_lock);
     441             : #endif
     442             : 
     443             :     /* Now wait for them to terminate. */
     444           0 :     WaitForTerminatingWorkers(pstate);
     445           0 : }
     446             : 
     447             : /*
     448             :  * Wait for all workers to terminate.
     449             :  */
     450             : static void
     451          12 : WaitForTerminatingWorkers(ParallelState *pstate)
     452             : {
     453          36 :     while (!HasEveryWorkerTerminated(pstate))
     454             :     {
     455          24 :         ParallelSlot *slot = NULL;
     456             :         int         j;
     457             : 
     458             : #ifndef WIN32
     459             :         /* On non-Windows, use wait() to wait for next worker to end */
     460             :         int         status;
     461          24 :         pid_t       pid = wait(&status);
     462             : 
     463             :         /* Find dead worker's slot, and clear the PID field */
     464          36 :         for (j = 0; j < pstate->numWorkers; j++)
     465             :         {
     466          36 :             slot = &(pstate->parallelSlot[j]);
     467          36 :             if (slot->pid == pid)
     468             :             {
     469          24 :                 slot->pid = 0;
     470          24 :                 break;
     471             :             }
     472             :         }
     473             : #else                           /* WIN32 */
     474             :         /* On Windows, we must use WaitForMultipleObjects() */
     475             :         HANDLE     *lpHandles = pg_malloc(sizeof(HANDLE) * pstate->numWorkers);
     476             :         int         nrun = 0;
     477             :         DWORD       ret;
     478             :         uintptr_t   hThread;
     479             : 
     480             :         for (j = 0; j < pstate->numWorkers; j++)
     481             :         {
     482             :             if (WORKER_IS_RUNNING(pstate->parallelSlot[j].workerStatus))
     483             :             {
     484             :                 lpHandles[nrun] = (HANDLE) pstate->parallelSlot[j].hThread;
     485             :                 nrun++;
     486             :             }
     487             :         }
     488             :         ret = WaitForMultipleObjects(nrun, lpHandles, false, INFINITE);
     489             :         Assert(ret != WAIT_FAILED);
     490             :         hThread = (uintptr_t) lpHandles[ret - WAIT_OBJECT_0];
     491             :         free(lpHandles);
     492             : 
     493             :         /* Find dead worker's slot, and clear the hThread field */
     494             :         for (j = 0; j < pstate->numWorkers; j++)
     495             :         {
     496             :             slot = &(pstate->parallelSlot[j]);
     497             :             if (slot->hThread == hThread)
     498             :             {
     499             :                 /* For cleanliness, close handles for dead threads */
     500             :                 CloseHandle((HANDLE) slot->hThread);
     501             :                 slot->hThread = (uintptr_t) INVALID_HANDLE_VALUE;
     502             :                 break;
     503             :             }
     504             :         }
     505             : #endif                          /* WIN32 */
     506             : 
     507             :         /* On all platforms, update workerStatus and te[] as well */
     508             :         Assert(j < pstate->numWorkers);
     509          24 :         slot->workerStatus = WRKR_TERMINATED;
     510          24 :         pstate->te[j] = NULL;
     511             :     }
     512          12 : }
     513             : 
     514             : 
     515             : /*
     516             :  * Code for responding to cancel interrupts (SIGINT, control-C, etc)
     517             :  *
     518             :  * This doesn't quite belong in this module, but it needs access to the
     519             :  * ParallelState data, so there's not really a better place either.
     520             :  *
     521             :  * When we get a cancel interrupt, we could just die, but in pg_restore that
     522             :  * could leave a SQL command (e.g., CREATE INDEX on a large table) running
     523             :  * for a long time.  Instead, we try to send a cancel request and then die.
     524             :  * pg_dump probably doesn't really need this, but we might as well use it
     525             :  * there too.  Note that sending the cancel directly from the signal handler
     526             :  * is safe because PQcancel() is written to make it so.
     527             :  *
     528             :  * In parallel operation on Unix, each process is responsible for canceling
     529             :  * its own connection (this must be so because nobody else has access to it).
     530             :  * Furthermore, the leader process should attempt to forward its signal to
     531             :  * each child.  In simple manual use of pg_dump/pg_restore, forwarding isn't
     532             :  * needed because typing control-C at the console would deliver SIGINT to
     533             :  * every member of the terminal process group --- but in other scenarios it
     534             :  * might be that only the leader gets signaled.
     535             :  *
     536             :  * On Windows, the cancel handler runs in a separate thread, because that's
     537             :  * how SetConsoleCtrlHandler works.  We make it stop worker threads, send
     538             :  * cancels on all active connections, and then return FALSE, which will allow
     539             :  * the process to die.  For safety's sake, we use a critical section to
     540             :  * protect the PGcancel structures against being changed while the signal
     541             :  * thread runs.
     542             :  */
     543             : 
     544             : #ifndef WIN32
     545             : 
     546             : /*
     547             :  * Signal handler (Unix only)
     548             :  */
     549             : static void
     550           0 : sigTermHandler(SIGNAL_ARGS)
     551             : {
     552             :     int         i;
     553             :     char        errbuf[1];
     554             : 
     555             :     /*
     556             :      * Some platforms allow delivery of new signals to interrupt an active
     557             :      * signal handler.  That could muck up our attempt to send PQcancel, so
     558             :      * disable the signals that setup_cancel_handler enabled.
     559             :      */
     560           0 :     pqsignal(SIGINT, SIG_IGN);
     561           0 :     pqsignal(SIGTERM, SIG_IGN);
     562           0 :     pqsignal(SIGQUIT, SIG_IGN);
     563             : 
     564             :     /*
     565             :      * If we're in the leader, forward signal to all workers.  (It seems best
     566             :      * to do this before PQcancel; killing the leader transaction will result
     567             :      * in invalid-snapshot errors from active workers, which maybe we can
     568             :      * quiet by killing workers first.)  Ignore any errors.
     569             :      */
     570           0 :     if (signal_info.pstate != NULL)
     571             :     {
     572           0 :         for (i = 0; i < signal_info.pstate->numWorkers; i++)
     573             :         {
     574           0 :             pid_t       pid = signal_info.pstate->parallelSlot[i].pid;
     575             : 
     576           0 :             if (pid != 0)
     577           0 :                 kill(pid, SIGTERM);
     578             :         }
     579             :     }
     580             : 
     581             :     /*
     582             :      * Send QueryCancel if we have a connection to send to.  Ignore errors,
     583             :      * there's not much we can do about them anyway.
     584             :      */
     585           0 :     if (signal_info.myAH != NULL && signal_info.myAH->connCancel != NULL)
     586           0 :         (void) PQcancel(signal_info.myAH->connCancel, errbuf, sizeof(errbuf));
     587             : 
     588             :     /*
     589             :      * Report we're quitting, using nothing more complicated than write(2).
     590             :      * When in parallel operation, only the leader process should do this.
     591             :      */
     592           0 :     if (!signal_info.am_worker)
     593             :     {
     594           0 :         if (progname)
     595             :         {
     596           0 :             write_stderr(progname);
     597           0 :             write_stderr(": ");
     598             :         }
     599           0 :         write_stderr("terminated by user\n");
     600             :     }
     601             : 
     602             :     /*
     603             :      * And die, using _exit() not exit() because the latter will invoke atexit
     604             :      * handlers that can fail if we interrupted related code.
     605             :      */
     606           0 :     _exit(1);
     607             : }
     608             : 
     609             : /*
     610             :  * Enable cancel interrupt handler, if not already done.
     611             :  */
     612             : static void
     613         522 : setup_cancel_handler(void)
     614             : {
     615             :     /*
     616             :      * When forking, signal_info.handler_set will propagate into the new
     617             :      * process, but that's fine because the signal handler state does too.
     618             :      */
     619         522 :     if (!signal_info.handler_set)
     620             :     {
     621         208 :         signal_info.handler_set = true;
     622             : 
     623         208 :         pqsignal(SIGINT, sigTermHandler);
     624         208 :         pqsignal(SIGTERM, sigTermHandler);
     625         208 :         pqsignal(SIGQUIT, sigTermHandler);
     626             :     }
     627         522 : }
     628             : 
     629             : #else                           /* WIN32 */
     630             : 
     631             : /*
     632             :  * Console interrupt handler --- runs in a newly-started thread.
     633             :  *
     634             :  * After stopping other threads and sending cancel requests on all open
     635             :  * connections, we return FALSE which will allow the default ExitProcess()
     636             :  * action to be taken.
     637             :  */
     638             : static BOOL WINAPI
     639             : consoleHandler(DWORD dwCtrlType)
     640             : {
     641             :     int         i;
     642             :     char        errbuf[1];
     643             : 
     644             :     if (dwCtrlType == CTRL_C_EVENT ||
     645             :         dwCtrlType == CTRL_BREAK_EVENT)
     646             :     {
     647             :         /* Critical section prevents changing data we look at here */
     648             :         EnterCriticalSection(&signal_info_lock);
     649             : 
     650             :         /*
     651             :          * If in parallel mode, stop worker threads and send QueryCancel to
     652             :          * their connected backends.  The main point of stopping the worker
     653             :          * threads is to keep them from reporting the query cancels as errors,
     654             :          * which would clutter the user's screen.  We needn't stop the leader
     655             :          * thread since it won't be doing much anyway.  Do this before
     656             :          * canceling the main transaction, else we might get invalid-snapshot
     657             :          * errors reported before we can stop the workers.  Ignore errors,
     658             :          * there's not much we can do about them anyway.
     659             :          */
     660             :         if (signal_info.pstate != NULL)
     661             :         {
     662             :             for (i = 0; i < signal_info.pstate->numWorkers; i++)
     663             :             {
     664             :                 ParallelSlot *slot = &(signal_info.pstate->parallelSlot[i]);
     665             :                 ArchiveHandle *AH = slot->AH;
     666             :                 HANDLE      hThread = (HANDLE) slot->hThread;
     667             : 
     668             :                 /*
     669             :                  * Using TerminateThread here may leave some resources leaked,
     670             :                  * but it doesn't matter since we're about to end the whole
     671             :                  * process.
     672             :                  */
     673             :                 if (hThread != INVALID_HANDLE_VALUE)
     674             :                     TerminateThread(hThread, 0);
     675             : 
     676             :                 if (AH != NULL && AH->connCancel != NULL)
     677             :                     (void) PQcancel(AH->connCancel, errbuf, sizeof(errbuf));
     678             :             }
     679             :         }
     680             : 
     681             :         /*
     682             :          * Send QueryCancel to leader connection, if enabled.  Ignore errors,
     683             :          * there's not much we can do about them anyway.
     684             :          */
     685             :         if (signal_info.myAH != NULL && signal_info.myAH->connCancel != NULL)
     686             :             (void) PQcancel(signal_info.myAH->connCancel,
     687             :                             errbuf, sizeof(errbuf));
     688             : 
     689             :         LeaveCriticalSection(&signal_info_lock);
     690             : 
     691             :         /*
     692             :          * Report we're quitting, using nothing more complicated than
     693             :          * write(2).  (We might be able to get away with using pg_log_*()
     694             :          * here, but since we terminated other threads uncleanly above, it
     695             :          * seems better to assume as little as possible.)
     696             :          */
     697             :         if (progname)
     698             :         {
     699             :             write_stderr(progname);
     700             :             write_stderr(": ");
     701             :         }
     702             :         write_stderr("terminated by user\n");
     703             :     }
     704             : 
     705             :     /* Always return FALSE to allow signal handling to continue */
     706             :     return FALSE;
     707             : }
     708             : 
     709             : /*
     710             :  * Enable cancel interrupt handler, if not already done.
     711             :  */
     712             : static void
     713             : setup_cancel_handler(void)
     714             : {
     715             :     if (!signal_info.handler_set)
     716             :     {
     717             :         signal_info.handler_set = true;
     718             : 
     719             :         InitializeCriticalSection(&signal_info_lock);
     720             : 
     721             :         SetConsoleCtrlHandler(consoleHandler, TRUE);
     722             :     }
     723             : }
     724             : 
     725             : #endif                          /* WIN32 */
     726             : 
     727             : 
     728             : /*
     729             :  * set_archive_cancel_info
     730             :  *
     731             :  * Fill AH->connCancel with cancellation info for the specified database
     732             :  * connection; or clear it if conn is NULL.
     733             :  */
     734             : void
     735         522 : set_archive_cancel_info(ArchiveHandle *AH, PGconn *conn)
     736             : {
     737             :     PGcancel   *oldConnCancel;
     738             : 
     739             :     /*
     740             :      * Activate the interrupt handler if we didn't yet in this process.  On
     741             :      * Windows, this also initializes signal_info_lock; therefore it's
     742             :      * important that this happen at least once before we fork off any
     743             :      * threads.
     744             :      */
     745         522 :     setup_cancel_handler();
     746             : 
     747             :     /*
     748             :      * On Unix, we assume that storing a pointer value is atomic with respect
     749             :      * to any possible signal interrupt.  On Windows, use a critical section.
     750             :      */
     751             : 
     752             : #ifdef WIN32
     753             :     EnterCriticalSection(&signal_info_lock);
     754             : #endif
     755             : 
     756             :     /* Free the old one if we have one */
     757         522 :     oldConnCancel = AH->connCancel;
     758             :     /* be sure interrupt handler doesn't use pointer while freeing */
     759         522 :     AH->connCancel = NULL;
     760             : 
     761         522 :     if (oldConnCancel != NULL)
     762         270 :         PQfreeCancel(oldConnCancel);
     763             : 
     764             :     /* Set the new one if specified */
     765         522 :     if (conn)
     766         270 :         AH->connCancel = PQgetCancel(conn);
     767             : 
     768             :     /*
     769             :      * On Unix, there's only ever one active ArchiveHandle per process, so we
     770             :      * can just set signal_info.myAH unconditionally.  On Windows, do that
     771             :      * only in the main thread; worker threads have to make sure their
     772             :      * ArchiveHandle appears in the pstate data, which is dealt with in
     773             :      * RunWorker().
     774             :      */
     775             : #ifndef WIN32
     776         522 :     signal_info.myAH = AH;
     777             : #else
     778             :     if (mainThreadId == GetCurrentThreadId())
     779             :         signal_info.myAH = AH;
     780             : #endif
     781             : 
     782             : #ifdef WIN32
     783             :     LeaveCriticalSection(&signal_info_lock);
     784             : #endif
     785         522 : }
     786             : 
     787             : /*
     788             :  * set_cancel_pstate
     789             :  *
     790             :  * Set signal_info.pstate to point to the specified ParallelState, if any.
     791             :  * We need this mainly to have an interlock against Windows signal thread.
     792             :  */
     793             : static void
     794          24 : set_cancel_pstate(ParallelState *pstate)
     795             : {
     796             : #ifdef WIN32
     797             :     EnterCriticalSection(&signal_info_lock);
     798             : #endif
     799             : 
     800          24 :     signal_info.pstate = pstate;
     801             : 
     802             : #ifdef WIN32
     803             :     LeaveCriticalSection(&signal_info_lock);
     804             : #endif
     805          24 : }
     806             : 
     807             : /*
     808             :  * set_cancel_slot_archive
     809             :  *
     810             :  * Set ParallelSlot's AH field to point to the specified archive, if any.
     811             :  * We need this mainly to have an interlock against Windows signal thread.
     812             :  */
     813             : static void
     814          48 : set_cancel_slot_archive(ParallelSlot *slot, ArchiveHandle *AH)
     815             : {
     816             : #ifdef WIN32
     817             :     EnterCriticalSection(&signal_info_lock);
     818             : #endif
     819             : 
     820          48 :     slot->AH = AH;
     821             : 
     822             : #ifdef WIN32
     823             :     LeaveCriticalSection(&signal_info_lock);
     824             : #endif
     825          48 : }
     826             : 
     827             : 
     828             : /*
     829             :  * This function is called by both Unix and Windows variants to set up
     830             :  * and run a worker process.  Caller should exit the process (or thread)
     831             :  * upon return.
     832             :  */
     833             : static void
     834          24 : RunWorker(ArchiveHandle *AH, ParallelSlot *slot)
     835             : {
     836             :     int         pipefd[2];
     837             : 
     838             :     /* fetch child ends of pipes */
     839          24 :     pipefd[PIPE_READ] = slot->pipeRevRead;
     840          24 :     pipefd[PIPE_WRITE] = slot->pipeRevWrite;
     841             : 
     842             :     /*
     843             :      * Clone the archive so that we have our own state to work with, and in
     844             :      * particular our own database connection.
     845             :      *
     846             :      * We clone on Unix as well as Windows, even though technically we don't
     847             :      * need to because fork() gives us a copy in our own address space
     848             :      * already.  But CloneArchive resets the state information and also clones
     849             :      * the database connection which both seem kinda helpful.
     850             :      */
     851          24 :     AH = CloneArchive(AH);
     852             : 
     853             :     /* Remember cloned archive where signal handler can find it */
     854          24 :     set_cancel_slot_archive(slot, AH);
     855             : 
     856             :     /*
     857             :      * Call the setup worker function that's defined in the ArchiveHandle.
     858             :      */
     859          24 :     (AH->SetupWorkerPtr) ((Archive *) AH);
     860             : 
     861             :     /*
     862             :      * Execute commands until done.
     863             :      */
     864          24 :     WaitForCommands(AH, pipefd);
     865             : 
     866             :     /*
     867             :      * Disconnect from database and clean up.
     868             :      */
     869          24 :     set_cancel_slot_archive(slot, NULL);
     870          24 :     DisconnectDatabase(&(AH->public));
     871          24 :     DeCloneArchive(AH);
     872          24 : }
     873             : 
     874             : /*
     875             :  * Thread base function for Windows
     876             :  */
     877             : #ifdef WIN32
     878             : static unsigned __stdcall
     879             : init_spawned_worker_win32(WorkerInfo *wi)
     880             : {
     881             :     ArchiveHandle *AH = wi->AH;
     882             :     ParallelSlot *slot = wi->slot;
     883             : 
     884             :     /* Don't need WorkerInfo anymore */
     885             :     free(wi);
     886             : 
     887             :     /* Run the worker ... */
     888             :     RunWorker(AH, slot);
     889             : 
     890             :     /* Exit the thread */
     891             :     _endthreadex(0);
     892             :     return 0;
     893             : }
     894             : #endif                          /* WIN32 */
     895             : 
     896             : /*
     897             :  * This function starts a parallel dump or restore by spawning off the worker
     898             :  * processes.  For Windows, it creates a number of threads; on Unix the
     899             :  * workers are created with fork().
     900             :  */
     901             : ParallelState *
     902          16 : ParallelBackupStart(ArchiveHandle *AH)
     903             : {
     904             :     ParallelState *pstate;
     905             :     int         i;
     906             : 
     907             :     Assert(AH->public.numWorkers > 0);
     908             : 
     909          16 :     pstate = (ParallelState *) pg_malloc(sizeof(ParallelState));
     910             : 
     911          16 :     pstate->numWorkers = AH->public.numWorkers;
     912          16 :     pstate->te = NULL;
     913          16 :     pstate->parallelSlot = NULL;
     914             : 
     915          16 :     if (AH->public.numWorkers == 1)
     916           4 :         return pstate;
     917             : 
     918             :     /* Create status arrays, being sure to initialize all fields to 0 */
     919          12 :     pstate->te = (TocEntry **)
     920          12 :         pg_malloc0(pstate->numWorkers * sizeof(TocEntry *));
     921          12 :     pstate->parallelSlot = (ParallelSlot *)
     922          12 :         pg_malloc0(pstate->numWorkers * sizeof(ParallelSlot));
     923             : 
     924             : #ifdef WIN32
     925             :     /* Make fmtId() and fmtQualifiedId() use thread-local storage */
     926             :     getLocalPQExpBuffer = getThreadLocalPQExpBuffer;
     927             : #endif
     928             : 
     929             :     /*
     930             :      * Set the pstate in shutdown_info, to tell the exit handler that it must
     931             :      * clean up workers as well as the main database connection.  But we don't
     932             :      * set this in signal_info yet, because we don't want child processes to
     933             :      * inherit non-NULL signal_info.pstate.
     934             :      */
     935          12 :     shutdown_info.pstate = pstate;
     936             : 
     937             :     /*
     938             :      * Temporarily disable query cancellation on the leader connection.  This
     939             :      * ensures that child processes won't inherit valid AH->connCancel
     940             :      * settings and thus won't try to issue cancels against the leader's
     941             :      * connection.  No harm is done if we fail while it's disabled, because
     942             :      * the leader connection is idle at this point anyway.
     943             :      */
     944          12 :     set_archive_cancel_info(AH, NULL);
     945             : 
     946             :     /* Ensure stdio state is quiesced before forking */
     947          12 :     fflush(NULL);
     948             : 
     949             :     /* Create desired number of workers */
     950          36 :     for (i = 0; i < pstate->numWorkers; i++)
     951             :     {
     952             : #ifdef WIN32
     953             :         WorkerInfo *wi;
     954             :         uintptr_t   handle;
     955             : #else
     956             :         pid_t       pid;
     957             : #endif
     958          24 :         ParallelSlot *slot = &(pstate->parallelSlot[i]);
     959             :         int         pipeMW[2],
     960             :                     pipeWM[2];
     961             : 
     962             :         /* Create communication pipes for this worker */
     963          24 :         if (pgpipe(pipeMW) < 0 || pgpipe(pipeWM) < 0)
     964           0 :             fatal("could not create communication channels: %m");
     965             : 
     966             :         /* leader's ends of the pipes */
     967          24 :         slot->pipeRead = pipeWM[PIPE_READ];
     968          24 :         slot->pipeWrite = pipeMW[PIPE_WRITE];
     969             :         /* child's ends of the pipes */
     970          24 :         slot->pipeRevRead = pipeMW[PIPE_READ];
     971          24 :         slot->pipeRevWrite = pipeWM[PIPE_WRITE];
     972             : 
     973             : #ifdef WIN32
     974             :         /* Create transient structure to pass args to worker function */
     975             :         wi = (WorkerInfo *) pg_malloc(sizeof(WorkerInfo));
     976             : 
     977             :         wi->AH = AH;
     978             :         wi->slot = slot;
     979             : 
     980             :         handle = _beginthreadex(NULL, 0, (void *) &init_spawned_worker_win32,
     981             :                                 wi, 0, &(slot->threadId));
     982             :         slot->hThread = handle;
     983             :         slot->workerStatus = WRKR_IDLE;
     984             : #else                           /* !WIN32 */
     985          24 :         pid = fork();
     986          48 :         if (pid == 0)
     987             :         {
     988             :             /* we are the worker */
     989             :             int         j;
     990             : 
     991             :             /* this is needed for GetMyPSlot() */
     992          24 :             slot->pid = getpid();
     993             : 
     994             :             /* instruct signal handler that we're in a worker now */
     995          24 :             signal_info.am_worker = true;
     996             : 
     997             :             /* close read end of Worker -> Leader */
     998          24 :             closesocket(pipeWM[PIPE_READ]);
     999             :             /* close write end of Leader -> Worker */
    1000          24 :             closesocket(pipeMW[PIPE_WRITE]);
    1001             : 
    1002             :             /*
    1003             :              * Close all inherited fds for communication of the leader with
    1004             :              * previously-forked workers.
    1005             :              */
    1006          36 :             for (j = 0; j < i; j++)
    1007             :             {
    1008          12 :                 closesocket(pstate->parallelSlot[j].pipeRead);
    1009          12 :                 closesocket(pstate->parallelSlot[j].pipeWrite);
    1010             :             }
    1011             : 
    1012             :             /* Run the worker ... */
    1013          24 :             RunWorker(AH, slot);
    1014             : 
    1015             :             /* We can just exit(0) when done */
    1016          24 :             exit(0);
    1017             :         }
    1018          24 :         else if (pid < 0)
    1019             :         {
    1020             :             /* fork failed */
    1021           0 :             fatal("could not create worker process: %m");
    1022             :         }
    1023             : 
    1024             :         /* In Leader after successful fork */
    1025          24 :         slot->pid = pid;
    1026          24 :         slot->workerStatus = WRKR_IDLE;
    1027             : 
    1028             :         /* close read end of Leader -> Worker */
    1029          24 :         closesocket(pipeMW[PIPE_READ]);
    1030             :         /* close write end of Worker -> Leader */
    1031          24 :         closesocket(pipeWM[PIPE_WRITE]);
    1032             : #endif                          /* WIN32 */
    1033             :     }
    1034             : 
    1035             :     /*
    1036             :      * Having forked off the workers, disable SIGPIPE so that leader isn't
    1037             :      * killed if it tries to send a command to a dead worker.  We don't want
    1038             :      * the workers to inherit this setting, though.
    1039             :      */
    1040             : #ifndef WIN32
    1041          12 :     pqsignal(SIGPIPE, SIG_IGN);
    1042             : #endif
    1043             : 
    1044             :     /*
    1045             :      * Re-establish query cancellation on the leader connection.
    1046             :      */
    1047          12 :     set_archive_cancel_info(AH, AH->connection);
    1048             : 
    1049             :     /*
    1050             :      * Tell the cancel signal handler to forward signals to worker processes,
    1051             :      * too.  (As with query cancel, we did not need this earlier because the
    1052             :      * workers have not yet been given anything to do; if we die before this
    1053             :      * point, any already-started workers will see EOF and quit promptly.)
    1054             :      */
    1055          12 :     set_cancel_pstate(pstate);
    1056             : 
    1057          12 :     return pstate;
    1058             : }
    1059             : 
    1060             : /*
    1061             :  * Close down a parallel dump or restore.
    1062             :  */
    1063             : void
    1064          16 : ParallelBackupEnd(ArchiveHandle *AH, ParallelState *pstate)
    1065             : {
    1066             :     int         i;
    1067             : 
    1068             :     /* No work if non-parallel */
    1069          16 :     if (pstate->numWorkers == 1)
    1070           4 :         return;
    1071             : 
    1072             :     /* There should not be any unfinished jobs */
    1073             :     Assert(IsEveryWorkerIdle(pstate));
    1074             : 
    1075             :     /* Close the sockets so that the workers know they can exit */
    1076          36 :     for (i = 0; i < pstate->numWorkers; i++)
    1077             :     {
    1078          24 :         closesocket(pstate->parallelSlot[i].pipeRead);
    1079          24 :         closesocket(pstate->parallelSlot[i].pipeWrite);
    1080             :     }
    1081             : 
    1082             :     /* Wait for them to exit */
    1083          12 :     WaitForTerminatingWorkers(pstate);
    1084             : 
    1085             :     /*
    1086             :      * Unlink pstate from shutdown_info, so the exit handler will not try to
    1087             :      * use it; and likewise unlink from signal_info.
    1088             :      */
    1089          12 :     shutdown_info.pstate = NULL;
    1090          12 :     set_cancel_pstate(NULL);
    1091             : 
    1092             :     /* Release state (mere neatnik-ism, since we're about to terminate) */
    1093          12 :     free(pstate->te);
    1094          12 :     free(pstate->parallelSlot);
    1095          12 :     free(pstate);
    1096             : }
    1097             : 
    1098             : /*
    1099             :  * These next four functions handle construction and parsing of the command
    1100             :  * strings and response strings for parallel workers.
    1101             :  *
    1102             :  * Currently, these can be the same regardless of which archive format we are
    1103             :  * processing.  In future, we might want to let format modules override these
    1104             :  * functions to add format-specific data to a command or response.
    1105             :  */
    1106             : 
    1107             : /*
    1108             :  * buildWorkerCommand: format a command string to send to a worker.
    1109             :  *
    1110             :  * The string is built in the caller-supplied buffer of size buflen.
    1111             :  */
    1112             : static void
    1113          66 : buildWorkerCommand(ArchiveHandle *AH, TocEntry *te, T_Action act,
    1114             :                    char *buf, int buflen)
    1115             : {
    1116          66 :     if (act == ACT_DUMP)
    1117          62 :         snprintf(buf, buflen, "DUMP %d", te->dumpId);
    1118           4 :     else if (act == ACT_RESTORE)
    1119           4 :         snprintf(buf, buflen, "RESTORE %d", te->dumpId);
    1120             :     else
    1121             :         Assert(false);
    1122          66 : }
    1123             : 
    1124             : /*
    1125             :  * parseWorkerCommand: interpret a command string in a worker.
    1126             :  */
    1127             : static void
    1128          66 : parseWorkerCommand(ArchiveHandle *AH, TocEntry **te, T_Action *act,
    1129             :                    const char *msg)
    1130             : {
    1131             :     DumpId      dumpId;
    1132             :     int         nBytes;
    1133             : 
    1134          66 :     if (messageStartsWith(msg, "DUMP "))
    1135             :     {
    1136          62 :         *act = ACT_DUMP;
    1137          62 :         sscanf(msg, "DUMP %d%n", &dumpId, &nBytes);
    1138             :         Assert(nBytes == strlen(msg));
    1139          62 :         *te = getTocEntryByDumpId(AH, dumpId);
    1140             :         Assert(*te != NULL);
    1141             :     }
    1142           4 :     else if (messageStartsWith(msg, "RESTORE "))
    1143             :     {
    1144           4 :         *act = ACT_RESTORE;
    1145           4 :         sscanf(msg, "RESTORE %d%n", &dumpId, &nBytes);
    1146             :         Assert(nBytes == strlen(msg));
    1147           4 :         *te = getTocEntryByDumpId(AH, dumpId);
    1148             :         Assert(*te != NULL);
    1149             :     }
    1150             :     else
    1151           0 :         fatal("unrecognized command received from leader: \"%s\"",
    1152             :               msg);
    1153          66 : }
    1154             : 
    1155             : /*
    1156             :  * buildWorkerResponse: format a response string to send to the leader.
    1157             :  *
    1158             :  * The string is built in the caller-supplied buffer of size buflen.
    1159             :  */
    1160             : static void
    1161          66 : buildWorkerResponse(ArchiveHandle *AH, TocEntry *te, T_Action act, int status,
    1162             :                     char *buf, int buflen)
    1163             : {
    1164          66 :     snprintf(buf, buflen, "OK %d %d %d",
    1165             :              te->dumpId,
    1166             :              status,
    1167             :              status == WORKER_IGNORED_ERRORS ? AH->public.n_errors : 0);
    1168          66 : }
    1169             : 
    1170             : /*
    1171             :  * parseWorkerResponse: parse the status message returned by a worker.
    1172             :  *
    1173             :  * Returns the integer status code, and may update fields of AH and/or te.
    1174             :  */
    1175             : static int
    1176          66 : parseWorkerResponse(ArchiveHandle *AH, TocEntry *te,
    1177             :                     const char *msg)
    1178             : {
    1179             :     DumpId      dumpId;
    1180             :     int         nBytes,
    1181             :                 n_errors;
    1182          66 :     int         status = 0;
    1183             : 
    1184          66 :     if (messageStartsWith(msg, "OK "))
    1185             :     {
    1186          66 :         sscanf(msg, "OK %d %d %d%n", &dumpId, &status, &n_errors, &nBytes);
    1187             : 
    1188             :         Assert(dumpId == te->dumpId);
    1189             :         Assert(nBytes == strlen(msg));
    1190             : 
    1191          66 :         AH->public.n_errors += n_errors;
    1192             :     }
    1193             :     else
    1194           0 :         fatal("invalid message received from worker: \"%s\"",
    1195             :               msg);
    1196             : 
    1197          66 :     return status;
    1198             : }
    1199             : 
    1200             : /*
    1201             :  * Dispatch a job to some free worker.
    1202             :  *
    1203             :  * te is the TocEntry to be processed, act is the action to be taken on it.
    1204             :  * callback is the function to call on completion of the job.
    1205             :  *
    1206             :  * If no worker is currently available, this will block, and previously
    1207             :  * registered callback functions may be called.
    1208             :  */
    1209             : void
    1210          66 : DispatchJobForTocEntry(ArchiveHandle *AH,
    1211             :                        ParallelState *pstate,
    1212             :                        TocEntry *te,
    1213             :                        T_Action act,
    1214             :                        ParallelCompletionPtr callback,
    1215             :                        void *callback_data)
    1216             : {
    1217             :     int         worker;
    1218             :     char        buf[256];
    1219             : 
    1220             :     /* Get a worker, waiting if none are idle */
    1221         114 :     while ((worker = GetIdleWorker(pstate)) == NO_SLOT)
    1222          48 :         WaitForWorkers(AH, pstate, WFW_ONE_IDLE);
    1223             : 
    1224             :     /* Construct and send command string */
    1225          66 :     buildWorkerCommand(AH, te, act, buf, sizeof(buf));
    1226             : 
    1227          66 :     sendMessageToWorker(pstate, worker, buf);
    1228             : 
    1229             :     /* Remember worker is busy, and which TocEntry it's working on */
    1230          66 :     pstate->parallelSlot[worker].workerStatus = WRKR_WORKING;
    1231          66 :     pstate->parallelSlot[worker].callback = callback;
    1232          66 :     pstate->parallelSlot[worker].callback_data = callback_data;
    1233          66 :     pstate->te[worker] = te;
    1234          66 : }
    1235             : 
    1236             : /*
    1237             :  * Find an idle worker and return its slot number.
    1238             :  * Return NO_SLOT if none are idle.
    1239             :  */
    1240             : static int
    1241         166 : GetIdleWorker(ParallelState *pstate)
    1242             : {
    1243             :     int         i;
    1244             : 
    1245         370 :     for (i = 0; i < pstate->numWorkers; i++)
    1246             :     {
    1247         274 :         if (pstate->parallelSlot[i].workerStatus == WRKR_IDLE)
    1248          70 :             return i;
    1249             :     }
    1250          96 :     return NO_SLOT;
    1251             : }
    1252             : 
    1253             : /*
    1254             :  * Return true iff no worker is running.
    1255             :  */
    1256             : static bool
    1257          36 : HasEveryWorkerTerminated(ParallelState *pstate)
    1258             : {
    1259             :     int         i;
    1260             : 
    1261          72 :     for (i = 0; i < pstate->numWorkers; i++)
    1262             :     {
    1263          60 :         if (WORKER_IS_RUNNING(pstate->parallelSlot[i].workerStatus))
    1264          24 :             return false;
    1265             :     }
    1266          12 :     return true;
    1267             : }
    1268             : 
    1269             : /*
    1270             :  * Return true iff every worker is in the WRKR_IDLE state.
    1271             :  */
    1272             : bool
    1273          38 : IsEveryWorkerIdle(ParallelState *pstate)
    1274             : {
    1275             :     int         i;
    1276             : 
    1277          82 :     for (i = 0; i < pstate->numWorkers; i++)
    1278             :     {
    1279          62 :         if (pstate->parallelSlot[i].workerStatus != WRKR_IDLE)
    1280          18 :             return false;
    1281             :     }
    1282          20 :     return true;
    1283             : }
    1284             : 
    1285             : /*
    1286             :  * Acquire lock on a table to be dumped by a worker process.
    1287             :  *
    1288             :  * The leader process is already holding an ACCESS SHARE lock.  Ordinarily
    1289             :  * it's no problem for a worker to get one too, but if anything else besides
    1290             :  * pg_dump is running, there's a possible deadlock:
    1291             :  *
    1292             :  * 1) Leader dumps the schema and locks all tables in ACCESS SHARE mode.
    1293             :  * 2) Another process requests an ACCESS EXCLUSIVE lock (which is not granted
    1294             :  *    because the leader holds a conflicting ACCESS SHARE lock).
    1295             :  * 3) A worker process also requests an ACCESS SHARE lock to read the table.
    1296             :  *    The worker is enqueued behind the ACCESS EXCLUSIVE lock request.
    1297             :  * 4) Now we have a deadlock, since the leader is effectively waiting for
    1298             :  *    the worker.  The server cannot detect that, however.
    1299             :  *
    1300             :  * To prevent an infinite wait, prior to touching a table in a worker, request
    1301             :  * a lock in ACCESS SHARE mode but with NOWAIT.  If we don't get the lock,
    1302             :  * then we know that somebody else has requested an ACCESS EXCLUSIVE lock and
    1303             :  * so we have a deadlock.  We must fail the backup in that case.
    1304             :  */
    1305             : static void
    1306          62 : lockTableForWorker(ArchiveHandle *AH, TocEntry *te)
    1307             : {
    1308             :     const char *qualId;
    1309             :     PQExpBuffer query;
    1310             :     PGresult   *res;
    1311             : 
    1312             :     /* Nothing to do for BLOBS */
    1313          62 :     if (strcmp(te->desc, "BLOBS") == 0)
    1314           2 :         return;
    1315             : 
    1316          60 :     query = createPQExpBuffer();
    1317             : 
    1318          60 :     qualId = fmtQualifiedId(te->namespace, te->tag);
    1319             : 
    1320          60 :     appendPQExpBuffer(query, "LOCK TABLE %s IN ACCESS SHARE MODE NOWAIT",
    1321             :                       qualId);
    1322             : 
    1323          60 :     res = PQexec(AH->connection, query->data);
    1324             : 
    1325          60 :     if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
    1326           0 :         fatal("could not obtain lock on relation \"%s\"\n"
    1327             :               "This usually means that someone requested an ACCESS EXCLUSIVE lock "
    1328             :               "on the table after the pg_dump parent process had gotten the "
    1329             :               "initial ACCESS SHARE lock on the table.", qualId);
    1330             : 
    1331          60 :     PQclear(res);
    1332          60 :     destroyPQExpBuffer(query);
    1333             : }
    1334             : 
    1335             : /*
    1336             :  * WaitForCommands: main routine for a worker process.
    1337             :  *
    1338             :  * Read and execute commands from the leader until we see EOF on the pipe.
    1339             :  */
    1340             : static void
    1341          24 : WaitForCommands(ArchiveHandle *AH, int pipefd[2])
    1342             : {
    1343             :     char       *command;
    1344             :     TocEntry   *te;
    1345             :     T_Action    act;
    1346          24 :     int         status = 0;
    1347             :     char        buf[256];
    1348             : 
    1349             :     for (;;)
    1350             :     {
    1351          90 :         if (!(command = getMessageFromLeader(pipefd)))
    1352             :         {
    1353             :             /* EOF, so done */
    1354          24 :             return;
    1355             :         }
    1356             : 
    1357             :         /* Decode the command */
    1358          66 :         parseWorkerCommand(AH, &te, &act, command);
    1359             : 
    1360          66 :         if (act == ACT_DUMP)
    1361             :         {
    1362             :             /* Acquire lock on this table within the worker's session */
    1363          62 :             lockTableForWorker(AH, te);
    1364             : 
    1365             :             /* Perform the dump command */
    1366          62 :             status = (AH->WorkerJobDumpPtr) (AH, te);
    1367             :         }
    1368           4 :         else if (act == ACT_RESTORE)
    1369             :         {
    1370             :             /* Perform the restore command */
    1371           4 :             status = (AH->WorkerJobRestorePtr) (AH, te);
    1372             :         }
    1373             :         else
    1374             :             Assert(false);
    1375             : 
    1376             :         /* Return status to leader */
    1377          66 :         buildWorkerResponse(AH, te, act, status, buf, sizeof(buf));
    1378             : 
    1379          66 :         sendMessageToLeader(pipefd, buf);
    1380             : 
    1381             :         /* command was pg_malloc'd and we are responsible for free()ing it. */
    1382          66 :         free(command);
    1383             :     }
    1384             : }
    1385             : 
    1386             : /*
    1387             :  * Check for status messages from workers.
    1388             :  *
    1389             :  * If do_wait is true, wait to get a status message; otherwise, just return
    1390             :  * immediately if there is none available.
    1391             :  *
    1392             :  * When we get a status message, we pass the status code to the callback
    1393             :  * function that was specified to DispatchJobForTocEntry, then reset the
    1394             :  * worker status to IDLE.
    1395             :  *
    1396             :  * Returns true if we collected a status message, else false.
    1397             :  *
    1398             :  * XXX is it worth checking for more than one status message per call?
    1399             :  * It seems somewhat unlikely that multiple workers would finish at exactly
    1400             :  * the same time.
    1401             :  */
    1402             : static bool
    1403         126 : ListenToWorkers(ArchiveHandle *AH, ParallelState *pstate, bool do_wait)
    1404             : {
    1405             :     int         worker;
    1406             :     char       *msg;
    1407             : 
    1408             :     /* Try to collect a status message */
    1409         126 :     msg = getMessageFromWorker(pstate, do_wait, &worker);
    1410             : 
    1411         126 :     if (!msg)
    1412             :     {
    1413             :         /* If do_wait is true, we must have detected EOF on some socket */
    1414          60 :         if (do_wait)
    1415           0 :             fatal("a worker process died unexpectedly");
    1416          60 :         return false;
    1417             :     }
    1418             : 
    1419             :     /* Process it and update our idea of the worker's status */
    1420          66 :     if (messageStartsWith(msg, "OK "))
    1421             :     {
    1422          66 :         ParallelSlot *slot = &pstate->parallelSlot[worker];
    1423          66 :         TocEntry   *te = pstate->te[worker];
    1424             :         int         status;
    1425             : 
    1426          66 :         status = parseWorkerResponse(AH, te, msg);
    1427          66 :         slot->callback(AH, te, status, slot->callback_data);
    1428          66 :         slot->workerStatus = WRKR_IDLE;
    1429          66 :         pstate->te[worker] = NULL;
    1430             :     }
    1431             :     else
    1432           0 :         fatal("invalid message received from worker: \"%s\"",
    1433             :               msg);
    1434             : 
    1435             :     /* Free the string returned from getMessageFromWorker */
    1436          66 :     free(msg);
    1437             : 
    1438          66 :     return true;
    1439             : }
    1440             : 
    1441             : /*
    1442             :  * Check for status results from workers, waiting if necessary.
    1443             :  *
    1444             :  * Available wait modes are:
    1445             :  * WFW_NO_WAIT: reap any available status, but don't block
    1446             :  * WFW_GOT_STATUS: wait for at least one more worker to finish
    1447             :  * WFW_ONE_IDLE: wait for at least one worker to be idle
    1448             :  * WFW_ALL_IDLE: wait for all workers to be idle
    1449             :  *
    1450             :  * Any received results are passed to the callback specified to
    1451             :  * DispatchJobForTocEntry.
    1452             :  *
    1453             :  * This function is executed in the leader process.
    1454             :  */
    1455             : void
    1456          64 : WaitForWorkers(ArchiveHandle *AH, ParallelState *pstate, WFW_WaitOption mode)
    1457             : {
    1458          64 :     bool        do_wait = false;
    1459             : 
    1460             :     /*
    1461             :      * In GOT_STATUS mode, always block waiting for a message, since we can't
    1462             :      * return till we get something.  In other modes, we don't block the first
    1463             :      * time through the loop.
    1464             :      */
    1465          64 :     if (mode == WFW_GOT_STATUS)
    1466             :     {
    1467             :         /* Assert that caller knows what it's doing */
    1468             :         Assert(!IsEveryWorkerIdle(pstate));
    1469           4 :         do_wait = true;
    1470             :     }
    1471             : 
    1472             :     for (;;)
    1473             :     {
    1474             :         /*
    1475             :          * Check for status messages, even if we don't need to block.  We do
    1476             :          * not try very hard to reap all available messages, though, since
    1477             :          * there's unlikely to be more than one.
    1478             :          */
    1479         126 :         if (ListenToWorkers(AH, pstate, do_wait))
    1480             :         {
    1481             :             /*
    1482             :              * If we got a message, we are done by definition for GOT_STATUS
    1483             :              * mode, and we can also be certain that there's at least one idle
    1484             :              * worker.  So we're done in all but ALL_IDLE mode.
    1485             :              */
    1486          66 :             if (mode != WFW_ALL_IDLE)
    1487          52 :                 return;
    1488             :         }
    1489             : 
    1490             :         /* Check whether we must wait for new status messages */
    1491          74 :         switch (mode)
    1492             :         {
    1493           0 :             case WFW_NO_WAIT:
    1494           0 :                 return;         /* never wait */
    1495           0 :             case WFW_GOT_STATUS:
    1496             :                 Assert(false);  /* can't get here, because we waited */
    1497           0 :                 break;
    1498          52 :             case WFW_ONE_IDLE:
    1499          52 :                 if (GetIdleWorker(pstate) != NO_SLOT)
    1500           4 :                     return;
    1501          48 :                 break;
    1502          22 :             case WFW_ALL_IDLE:
    1503          22 :                 if (IsEveryWorkerIdle(pstate))
    1504           8 :                     return;
    1505          14 :                 break;
    1506             :         }
    1507             : 
    1508             :         /* Loop back, and this time wait for something to happen */
    1509          62 :         do_wait = true;
    1510             :     }
    1511             : }
    1512             : 
    1513             : /*
    1514             :  * Read one command message from the leader, blocking if necessary
    1515             :  * until one is available, and return it as a malloc'd string.
    1516             :  * On EOF, return NULL.
    1517             :  *
    1518             :  * This function is executed in worker processes.
    1519             :  */
    1520             : static char *
    1521          90 : getMessageFromLeader(int pipefd[2])
    1522             : {
    1523          90 :     return readMessageFromPipe(pipefd[PIPE_READ]);
    1524             : }
    1525             : 
    1526             : /*
    1527             :  * Send a status message to the leader.
    1528             :  *
    1529             :  * This function is executed in worker processes.
    1530             :  */
    1531             : static void
    1532          66 : sendMessageToLeader(int pipefd[2], const char *str)
    1533             : {
    1534          66 :     int         len = strlen(str) + 1;
    1535             : 
    1536          66 :     if (pipewrite(pipefd[PIPE_WRITE], str, len) != len)
    1537           0 :         fatal("could not write to the communication channel: %m");
    1538          66 : }
    1539             : 
    1540             : /*
    1541             :  * Wait until some descriptor in "workerset" becomes readable.
    1542             :  * Returns -1 on error, else the number of readable descriptors.
    1543             :  */
    1544             : static int
    1545          66 : select_loop(int maxFd, fd_set *workerset)
    1546             : {
    1547             :     int         i;
    1548          66 :     fd_set      saveSet = *workerset;
    1549             : 
    1550             :     for (;;)
    1551             :     {
    1552          66 :         *workerset = saveSet;
    1553          66 :         i = select(maxFd + 1, workerset, NULL, NULL, NULL);
    1554             : 
    1555             : #ifndef WIN32
    1556          66 :         if (i < 0 && errno == EINTR)
    1557           0 :             continue;
    1558             : #else
    1559             :         if (i == SOCKET_ERROR && WSAGetLastError() == WSAEINTR)
    1560             :             continue;
    1561             : #endif
    1562          66 :         break;
    1563             :     }
    1564             : 
    1565          66 :     return i;
    1566             : }
    1567             : 
    1568             : 
    1569             : /*
    1570             :  * Check for messages from worker processes.
    1571             :  *
    1572             :  * If a message is available, return it as a malloc'd string, and put the
    1573             :  * index of the sending worker in *worker.
    1574             :  *
    1575             :  * If nothing is available, wait if "do_wait" is true, else return NULL.
    1576             :  *
    1577             :  * If we detect EOF on any socket, we'll return NULL.  It's not great that
    1578             :  * that's hard to distinguish from the no-data-available case, but for now
    1579             :  * our one caller is okay with that.
    1580             :  *
    1581             :  * This function is executed in the leader process.
    1582             :  */
    1583             : static char *
    1584         126 : getMessageFromWorker(ParallelState *pstate, bool do_wait, int *worker)
    1585             : {
    1586             :     int         i;
    1587             :     fd_set      workerset;
    1588         126 :     int         maxFd = -1;
    1589         126 :     struct timeval nowait = {0, 0};
    1590             : 
    1591             :     /* construct bitmap of socket descriptors for select() */
    1592         126 :     FD_ZERO(&workerset);
    1593         378 :     for (i = 0; i < pstate->numWorkers; i++)
    1594             :     {
    1595         252 :         if (!WORKER_IS_RUNNING(pstate->parallelSlot[i].workerStatus))
    1596           0 :             continue;
    1597         252 :         FD_SET(pstate->parallelSlot[i].pipeRead, &workerset);
    1598         252 :         if (pstate->parallelSlot[i].pipeRead > maxFd)
    1599         252 :             maxFd = pstate->parallelSlot[i].pipeRead;
    1600             :     }
    1601             : 
    1602         126 :     if (do_wait)
    1603             :     {
    1604          66 :         i = select_loop(maxFd, &workerset);
    1605             :         Assert(i != 0);
    1606             :     }
    1607             :     else
    1608             :     {
    1609          60 :         if ((i = select(maxFd + 1, &workerset, NULL, NULL, &nowait)) == 0)
    1610          60 :             return NULL;
    1611             :     }
    1612             : 
    1613          66 :     if (i < 0)
    1614           0 :         fatal("%s() failed: %m", "select");
    1615             : 
    1616          74 :     for (i = 0; i < pstate->numWorkers; i++)
    1617             :     {
    1618             :         char       *msg;
    1619             : 
    1620          74 :         if (!WORKER_IS_RUNNING(pstate->parallelSlot[i].workerStatus))
    1621           0 :             continue;
    1622          74 :         if (!FD_ISSET(pstate->parallelSlot[i].pipeRead, &workerset))
    1623           8 :             continue;
    1624             : 
    1625             :         /*
    1626             :          * Read the message if any.  If the socket is ready because of EOF,
    1627             :          * we'll return NULL instead (and the socket will stay ready, so the
    1628             :          * condition will persist).
    1629             :          *
    1630             :          * Note: because this is a blocking read, we'll wait if only part of
    1631             :          * the message is available.  Waiting a long time would be bad, but
    1632             :          * since worker status messages are short and are always sent in one
    1633             :          * operation, it shouldn't be a problem in practice.
    1634             :          */
    1635          66 :         msg = readMessageFromPipe(pstate->parallelSlot[i].pipeRead);
    1636          66 :         *worker = i;
    1637          66 :         return msg;
    1638             :     }
    1639             :     Assert(false);
    1640           0 :     return NULL;
    1641             : }
    1642             : 
    1643             : /*
    1644             :  * Send a command message to the specified worker process.
    1645             :  *
    1646             :  * This function is executed in the leader process.
    1647             :  */
    1648             : static void
    1649          66 : sendMessageToWorker(ParallelState *pstate, int worker, const char *str)
    1650             : {
    1651          66 :     int         len = strlen(str) + 1;
    1652             : 
    1653          66 :     if (pipewrite(pstate->parallelSlot[worker].pipeWrite, str, len) != len)
    1654             :     {
    1655           0 :         fatal("could not write to the communication channel: %m");
    1656             :     }
    1657          66 : }
    1658             : 
    1659             : /*
    1660             :  * Read one message from the specified pipe (fd), blocking if necessary
    1661             :  * until one is available, and return it as a malloc'd string.
    1662             :  * On EOF, return NULL.
    1663             :  *
    1664             :  * A "message" on the channel is just a null-terminated string.
    1665             :  */
    1666             : static char *
    1667         156 : readMessageFromPipe(int fd)
    1668             : {
    1669             :     char       *msg;
    1670             :     int         msgsize,
    1671             :                 bufsize;
    1672             :     int         ret;
    1673             : 
    1674             :     /*
    1675             :      * In theory, if we let piperead() read multiple bytes, it might give us
    1676             :      * back fragments of multiple messages.  (That can't actually occur, since
    1677             :      * neither leader nor workers send more than one message without waiting
    1678             :      * for a reply, but we don't wish to assume that here.)  For simplicity,
    1679             :      * read a byte at a time until we get the terminating '\0'.  This method
    1680             :      * is a bit inefficient, but since this is only used for relatively short
    1681             :      * command and status strings, it shouldn't matter.
    1682             :      */
    1683         156 :     bufsize = 64;               /* could be any number */
    1684         156 :     msg = (char *) pg_malloc(bufsize);
    1685         156 :     msgsize = 0;
    1686             :     for (;;)
    1687             :     {
    1688        1332 :         Assert(msgsize < bufsize);
    1689        1488 :         ret = piperead(fd, msg + msgsize, 1);
    1690        1488 :         if (ret <= 0)
    1691          24 :             break;              /* error or connection closure */
    1692             : 
    1693             :         Assert(ret == 1);
    1694             : 
    1695        1464 :         if (msg[msgsize] == '\0')
    1696         132 :             return msg;         /* collected whole message */
    1697             : 
    1698        1332 :         msgsize++;
    1699        1332 :         if (msgsize == bufsize) /* enlarge buffer if needed */
    1700             :         {
    1701           0 :             bufsize += 16;      /* could be any number */
    1702           0 :             msg = (char *) pg_realloc(msg, bufsize);
    1703             :         }
    1704             :     }
    1705             : 
    1706             :     /* Other end has closed the connection */
    1707          24 :     pg_free(msg);
    1708          24 :     return NULL;
    1709             : }
    1710             : 
    1711             : #ifdef WIN32
    1712             : 
    1713             : /*
    1714             :  * This is a replacement version of pipe(2) for Windows which allows the pipe
    1715             :  * handles to be used in select().
    1716             :  *
    1717             :  * Reads and writes on the pipe must go through piperead()/pipewrite().
    1718             :  *
    1719             :  * For consistency with Unix we declare the returned handles as "int".
    1720             :  * This is okay even on WIN64 because system handles are not more than
    1721             :  * 32 bits wide, but we do have to do some casting.
    1722             :  */
    1723             : static int
    1724             : pgpipe(int handles[2])
    1725             : {
    1726             :     pgsocket    s,
    1727             :                 tmp_sock;
    1728             :     struct sockaddr_in serv_addr;
    1729             :     int         len = sizeof(serv_addr);
    1730             : 
    1731             :     /* We have to use the Unix socket invalid file descriptor value here. */
    1732             :     handles[0] = handles[1] = -1;
    1733             : 
    1734             :     /*
    1735             :      * setup listen socket
    1736             :      */
    1737             :     if ((s = socket(AF_INET, SOCK_STREAM, 0)) == PGINVALID_SOCKET)
    1738             :     {
    1739             :         pg_log_error("pgpipe: could not create socket: error code %d",
    1740             :                      WSAGetLastError());
    1741             :         return -1;
    1742             :     }
    1743             : 
    1744             :     memset((void *) &serv_addr, 0, sizeof(serv_addr));
    1745             :     serv_addr.sin_family = AF_INET;
    1746             :     serv_addr.sin_port = pg_hton16(0);
    1747             :     serv_addr.sin_addr.s_addr = pg_hton32(INADDR_LOOPBACK);
    1748             :     if (bind(s, (SOCKADDR *) &serv_addr, len) == SOCKET_ERROR)
    1749             :     {
    1750             :         pg_log_error("pgpipe: could not bind: error code %d",
    1751             :                      WSAGetLastError());
    1752             :         closesocket(s);
    1753             :         return -1;
    1754             :     }
    1755             :     if (listen(s, 1) == SOCKET_ERROR)
    1756             :     {
    1757             :         pg_log_error("pgpipe: could not listen: error code %d",
    1758             :                      WSAGetLastError());
    1759             :         closesocket(s);
    1760             :         return -1;
    1761             :     }
    1762             :     if (getsockname(s, (SOCKADDR *) &serv_addr, &len) == SOCKET_ERROR)
    1763             :     {
    1764             :         pg_log_error("pgpipe: %s() failed: error code %d", "getsockname",
    1765             :                      WSAGetLastError());
    1766             :         closesocket(s);
    1767             :         return -1;
    1768             :     }
    1769             : 
    1770             :     /*
    1771             :      * setup pipe handles
    1772             :      */
    1773             :     if ((tmp_sock = socket(AF_INET, SOCK_STREAM, 0)) == PGINVALID_SOCKET)
    1774             :     {
    1775             :         pg_log_error("pgpipe: could not create second socket: error code %d",
    1776             :                      WSAGetLastError());
    1777             :         closesocket(s);
    1778             :         return -1;
    1779             :     }
    1780             :     handles[1] = (int) tmp_sock;
    1781             : 
    1782             :     if (connect(handles[1], (SOCKADDR *) &serv_addr, len) == SOCKET_ERROR)
    1783             :     {
    1784             :         pg_log_error("pgpipe: could not connect socket: error code %d",
    1785             :                      WSAGetLastError());
    1786             :         closesocket(handles[1]);
    1787             :         handles[1] = -1;
    1788             :         closesocket(s);
    1789             :         return -1;
    1790             :     }
    1791             :     if ((tmp_sock = accept(s, (SOCKADDR *) &serv_addr, &len)) == PGINVALID_SOCKET)
    1792             :     {
    1793             :         pg_log_error("pgpipe: could not accept connection: error code %d",
    1794             :                      WSAGetLastError());
    1795             :         closesocket(handles[1]);
    1796             :         handles[1] = -1;
    1797             :         closesocket(s);
    1798             :         return -1;
    1799             :     }
    1800             :     handles[0] = (int) tmp_sock;
    1801             : 
    1802             :     closesocket(s);
    1803             :     return 0;
    1804             : }
    1805             : 
    1806             : #endif                          /* WIN32 */

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