Line data    Source code

       1             : /* ----------
       2             :  * backend_progress.c
       3             :  *
       4             :  *  Command progress reporting infrastructure.
       5             :  *
       6             :  *  Copyright (c) 2001-2023, PostgreSQL Global Development Group
       7             :  *
       8             :  *  src/backend/utils/activity/backend_progress.c
       9             :  * ----------
      10             :  */
      11             : #include "postgres.h"
      12             : 
      13             : #include "access/parallel.h"
      14             : #include "libpq/pqformat.h"
      15             : #include "port/atomics.h"     /* for memory barriers */
      16             : #include "utils/backend_progress.h"
      17             : #include "utils/backend_status.h"
      18             : 
      19             : 
      20             : /*-----------
      21             :  * pgstat_progress_start_command() -
      22             :  *
      23             :  * Set st_progress_command (and st_progress_command_target) in own backend
      24             :  * entry.  Also, zero-initialize st_progress_param array.
      25             :  *-----------
      26             :  */
      27             : void
      28       60784 : pgstat_progress_start_command(ProgressCommandType cmdtype, Oid relid)
      29             : {
      30       60784 :     volatile PgBackendStatus *beentry = MyBEEntry;
      31             : 
      32       60784 :     if (!beentry || !pgstat_track_activities)
      33           0 :         return;
      34             : 
      35       60784 :     PGSTAT_BEGIN_WRITE_ACTIVITY(beentry);
      36       60784 :     beentry->st_progress_command = cmdtype;
      37       60784 :     beentry->st_progress_command_target = relid;
      38     1276464 :     MemSet(&beentry->st_progress_param, 0, sizeof(beentry->st_progress_param));
      39       60784 :     PGSTAT_END_WRITE_ACTIVITY(beentry);
      40             : }
      41             : 
      42             : /*-----------
      43             :  * pgstat_progress_update_param() -
      44             :  *
      45             :  * Update index'th member in st_progress_param[] of own backend entry.
      46             :  *-----------
      47             :  */
      48             : void
      49    20627450 : pgstat_progress_update_param(int index, int64 val)
      50             : {
      51    20627450 :     volatile PgBackendStatus *beentry = MyBEEntry;
      52             : 
      53             :     Assert(index >= 0 && index < PGSTAT_NUM_PROGRESS_PARAM);
      54             : 
      55    20627450 :     if (!beentry || !pgstat_track_activities)
      56           0 :         return;
      57             : 
      58    20627450 :     PGSTAT_BEGIN_WRITE_ACTIVITY(beentry);
      59    20627450 :     beentry->st_progress_param[index] = val;
      60    20627450 :     PGSTAT_END_WRITE_ACTIVITY(beentry);
      61             : }
      62             : 
      63             : /*-----------
      64             :  * pgstat_progress_incr_param() -
      65             :  *
      66             :  * Increment index'th member in st_progress_param[] of own backend entry.
      67             :  *-----------
      68             :  */
      69             : void
      70        2326 : pgstat_progress_incr_param(int index, int64 incr)
      71             : {
      72        2326 :     volatile PgBackendStatus *beentry = MyBEEntry;
      73             : 
      74             :     Assert(index >= 0 && index < PGSTAT_NUM_PROGRESS_PARAM);
      75             : 
      76        2326 :     if (!beentry || !pgstat_track_activities)
      77           0 :         return;
      78             : 
      79        2326 :     PGSTAT_BEGIN_WRITE_ACTIVITY(beentry);
      80        2326 :     beentry->st_progress_param[index] += incr;
      81        2326 :     PGSTAT_END_WRITE_ACTIVITY(beentry);
      82             : }
      83             : 
      84             : /*-----------
      85             :  * pgstat_progress_parallel_incr_param() -
      86             :  *
      87             :  * A variant of pgstat_progress_incr_param to allow a worker to poke at
      88             :  * a leader to do an incremental progress update.
      89             :  *-----------
      90             :  */
      91             : void
      92         120 : pgstat_progress_parallel_incr_param(int index, int64 incr)
      93             : {
      94             :     /*
      95             :      * Parallel workers notify a leader through a 'P' protocol message to
      96             :      * update progress, passing the progress index and incremented value.
      97             :      * Leaders can just call pgstat_progress_incr_param directly.
      98             :      */
      99         120 :     if (IsParallelWorker())
     100             :     {
     101             :         static StringInfoData progress_message;
     102             : 
     103           0 :         initStringInfo(&progress_message);
     104             : 
     105           0 :         pq_beginmessage(&progress_message, 'P');
     106           0 :         pq_sendint32(&progress_message, index);
     107           0 :         pq_sendint64(&progress_message, incr);
     108           0 :         pq_endmessage(&progress_message);
     109             :     }
     110             :     else
     111         120 :         pgstat_progress_incr_param(index, incr);
     112         120 : }
     113             : 
     114             : /*-----------
     115             :  * pgstat_progress_update_multi_param() -
     116             :  *
     117             :  * Update multiple members in st_progress_param[] of own backend entry.
     118             :  * This is atomic; readers won't see intermediate states.
     119             :  *-----------
     120             :  */
     121             : void
     122      841230 : pgstat_progress_update_multi_param(int nparam, const int *index,
     123             :                                    const int64 *val)
     124             : {
     125      841230 :     volatile PgBackendStatus *beentry = MyBEEntry;
     126             :     int         i;
     127             : 
     128      841230 :     if (!beentry || !pgstat_track_activities || nparam == 0)
     129           0 :         return;
     130             : 
     131      841230 :     PGSTAT_BEGIN_WRITE_ACTIVITY(beentry);
     132             : 
     133     2250276 :     for (i = 0; i < nparam; ++i)
     134             :     {
     135             :         Assert(index[i] >= 0 && index[i] < PGSTAT_NUM_PROGRESS_PARAM);
     136             : 
     137     1409046 :         beentry->st_progress_param[index[i]] = val[i];
     138             :     }
     139             : 
     140      841230 :     PGSTAT_END_WRITE_ACTIVITY(beentry);
     141             : }
     142             : 
     143             : /*-----------
     144             :  * pgstat_progress_end_command() -
     145             :  *
     146             :  * Reset st_progress_command (and st_progress_command_target) in own backend
     147             :  * entry.  This signals the end of the command.
     148             :  *-----------
     149             :  */
     150             : void
     151      109110 : pgstat_progress_end_command(void)
     152             : {
     153      109110 :     volatile PgBackendStatus *beentry = MyBEEntry;
     154             : 
     155      109110 :     if (!beentry || !pgstat_track_activities)
     156           0 :         return;
     157             : 
     158      109110 :     if (beentry->st_progress_command == PROGRESS_COMMAND_INVALID)
     159       49650 :         return;
     160             : 
     161       59460 :     PGSTAT_BEGIN_WRITE_ACTIVITY(beentry);
     162       59460 :     beentry->st_progress_command = PROGRESS_COMMAND_INVALID;
     163       59460 :     beentry->st_progress_command_target = InvalidOid;
     164       59460 :     PGSTAT_END_WRITE_ACTIVITY(beentry);
     165             : }