Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * procsignal.c
4 : * Routines for interprocess signaling
5 : *
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/backend/storage/ipc/procsignal.c
12 : *
13 : *-------------------------------------------------------------------------
14 : */
15 : #include "postgres.h"
16 :
17 : #include <signal.h>
18 : #include <unistd.h>
19 :
20 : #include "access/parallel.h"
21 : #include "port/pg_bitutils.h"
22 : #include "commands/async.h"
23 : #include "miscadmin.h"
24 : #include "pgstat.h"
25 : #include "replication/walsender.h"
26 : #include "storage/condition_variable.h"
27 : #include "storage/ipc.h"
28 : #include "storage/latch.h"
29 : #include "storage/proc.h"
30 : #include "storage/shmem.h"
31 : #include "storage/sinval.h"
32 : #include "tcop/tcopprot.h"
33 : #include "utils/memutils.h"
34 :
35 : /*
36 : * The SIGUSR1 signal is multiplexed to support signaling multiple event
37 : * types. The specific reason is communicated via flags in shared memory.
38 : * We keep a boolean flag for each possible "reason", so that different
39 : * reasons can be signaled to a process concurrently. (However, if the same
40 : * reason is signaled more than once nearly simultaneously, the process may
41 : * observe it only once.)
42 : *
43 : * Each process that wants to receive signals registers its process ID
44 : * in the ProcSignalSlots array. The array is indexed by backend ID to make
45 : * slot allocation simple, and to avoid having to search the array when you
46 : * know the backend ID of the process you're signaling. (We do support
47 : * signaling without backend ID, but it's a bit less efficient.)
48 : *
49 : * The flags are actually declared as "volatile sig_atomic_t" for maximum
50 : * portability. This should ensure that loads and stores of the flag
51 : * values are atomic, allowing us to dispense with any explicit locking.
52 : *
53 : * pss_signalFlags are intended to be set in cases where we don't need to
54 : * keep track of whether or not the target process has handled the signal,
55 : * but sometimes we need confirmation, as when making a global state change
56 : * that cannot be considered complete until all backends have taken notice
57 : * of it. For such use cases, we set a bit in pss_barrierCheckMask and then
58 : * increment the current "barrier generation"; when the new barrier generation
59 : * (or greater) appears in the pss_barrierGeneration flag of every process,
60 : * we know that the message has been received everywhere.
61 : */
62 : typedef struct
63 : {
64 : volatile pid_t pss_pid;
65 : volatile sig_atomic_t pss_signalFlags[NUM_PROCSIGNALS];
66 : pg_atomic_uint64 pss_barrierGeneration;
67 : pg_atomic_uint32 pss_barrierCheckMask;
68 : ConditionVariable pss_barrierCV;
69 : } ProcSignalSlot;
70 :
71 : /*
72 : * Information that is global to the entire ProcSignal system can be stored
73 : * here.
74 : *
75 : * psh_barrierGeneration is the highest barrier generation in existence.
76 : */
77 : typedef struct
78 : {
79 : pg_atomic_uint64 psh_barrierGeneration;
80 : ProcSignalSlot psh_slot[FLEXIBLE_ARRAY_MEMBER];
81 : } ProcSignalHeader;
82 :
83 : /*
84 : * We reserve a slot for each possible BackendId, plus one for each
85 : * possible auxiliary process type. (This scheme assumes there is not
86 : * more than one of any auxiliary process type at a time.)
87 : */
88 : #define NumProcSignalSlots (MaxBackends + NUM_AUXPROCTYPES)
89 :
90 : /* Check whether the relevant type bit is set in the flags. */
91 : #define BARRIER_SHOULD_CHECK(flags, type) \
92 : (((flags) & (((uint32) 1) << (uint32) (type))) != 0)
93 :
94 : /* Clear the relevant type bit from the flags. */
95 : #define BARRIER_CLEAR_BIT(flags, type) \
96 : ((flags) &= ~(((uint32) 1) << (uint32) (type)))
97 :
98 : static ProcSignalHeader *ProcSignal = NULL;
99 : static ProcSignalSlot *MyProcSignalSlot = NULL;
100 :
101 : static bool CheckProcSignal(ProcSignalReason reason);
102 : static void CleanupProcSignalState(int status, Datum arg);
103 : static void ResetProcSignalBarrierBits(uint32 flags);
104 : static bool ProcessBarrierPlaceholder(void);
105 :
106 : /*
107 : * ProcSignalShmemSize
108 : * Compute space needed for ProcSignal's shared memory
109 : */
110 : Size
111 6736 : ProcSignalShmemSize(void)
112 : {
113 : Size size;
114 :
115 6736 : size = mul_size(NumProcSignalSlots, sizeof(ProcSignalSlot));
116 6736 : size = add_size(size, offsetof(ProcSignalHeader, psh_slot));
117 6736 : return size;
118 : }
119 :
120 : /*
121 : * ProcSignalShmemInit
122 : * Allocate and initialize ProcSignal's shared memory
123 : */
124 : void
125 2894 : ProcSignalShmemInit(void)
126 : {
127 2894 : Size size = ProcSignalShmemSize();
128 : bool found;
129 :
130 2894 : ProcSignal = (ProcSignalHeader *)
131 2894 : ShmemInitStruct("ProcSignal", size, &found);
132 :
133 : /* If we're first, initialize. */
134 2894 : if (!found)
135 : {
136 : int i;
137 :
138 2894 : pg_atomic_init_u64(&ProcSignal->psh_barrierGeneration, 0);
139 :
140 323320 : for (i = 0; i < NumProcSignalSlots; ++i)
141 : {
142 320426 : ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
143 :
144 320426 : slot->pss_pid = 0;
145 320426 : MemSet(slot->pss_signalFlags, 0, sizeof(slot->pss_signalFlags));
146 320426 : pg_atomic_init_u64(&slot->pss_barrierGeneration, PG_UINT64_MAX);
147 320426 : pg_atomic_init_u32(&slot->pss_barrierCheckMask, 0);
148 320426 : ConditionVariableInit(&slot->pss_barrierCV);
149 : }
150 : }
151 2894 : }
152 :
153 : /*
154 : * ProcSignalInit
155 : * Register the current process in the ProcSignal array
156 : *
157 : * The passed index should be my BackendId if the process has one,
158 : * or MaxBackends + aux process type if not.
159 : */
160 : void
161 18504 : ProcSignalInit(int pss_idx)
162 : {
163 : ProcSignalSlot *slot;
164 : uint64 barrier_generation;
165 :
166 : Assert(pss_idx >= 1 && pss_idx <= NumProcSignalSlots);
167 :
168 18504 : slot = &ProcSignal->psh_slot[pss_idx - 1];
169 :
170 : /* sanity check */
171 18504 : if (slot->pss_pid != 0)
172 0 : elog(LOG, "process %d taking over ProcSignal slot %d, but it's not empty",
173 : MyProcPid, pss_idx);
174 :
175 : /* Clear out any leftover signal reasons */
176 18504 : MemSet(slot->pss_signalFlags, 0, NUM_PROCSIGNALS * sizeof(sig_atomic_t));
177 :
178 : /*
179 : * Initialize barrier state. Since we're a brand-new process, there
180 : * shouldn't be any leftover backend-private state that needs to be
181 : * updated. Therefore, we can broadcast the latest barrier generation and
182 : * disregard any previously-set check bits.
183 : *
184 : * NB: This only works if this initialization happens early enough in the
185 : * startup sequence that we haven't yet cached any state that might need
186 : * to be invalidated. That's also why we have a memory barrier here, to be
187 : * sure that any later reads of memory happen strictly after this.
188 : */
189 18504 : pg_atomic_write_u32(&slot->pss_barrierCheckMask, 0);
190 : barrier_generation =
191 18504 : pg_atomic_read_u64(&ProcSignal->psh_barrierGeneration);
192 18504 : pg_atomic_write_u64(&slot->pss_barrierGeneration, barrier_generation);
193 18504 : pg_memory_barrier();
194 :
195 : /* Mark slot with my PID */
196 18504 : slot->pss_pid = MyProcPid;
197 :
198 : /* Remember slot location for CheckProcSignal */
199 18504 : MyProcSignalSlot = slot;
200 :
201 : /* Set up to release the slot on process exit */
202 18504 : on_shmem_exit(CleanupProcSignalState, Int32GetDatum(pss_idx));
203 18504 : }
204 :
205 : /*
206 : * CleanupProcSignalState
207 : * Remove current process from ProcSignal mechanism
208 : *
209 : * This function is called via on_shmem_exit() during backend shutdown.
210 : */
211 : static void
212 18504 : CleanupProcSignalState(int status, Datum arg)
213 : {
214 18504 : int pss_idx = DatumGetInt32(arg);
215 : ProcSignalSlot *slot;
216 :
217 18504 : slot = &ProcSignal->psh_slot[pss_idx - 1];
218 : Assert(slot == MyProcSignalSlot);
219 :
220 : /*
221 : * Clear MyProcSignalSlot, so that a SIGUSR1 received after this point
222 : * won't try to access it after it's no longer ours (and perhaps even
223 : * after we've unmapped the shared memory segment).
224 : */
225 18504 : MyProcSignalSlot = NULL;
226 :
227 : /* sanity check */
228 18504 : if (slot->pss_pid != MyProcPid)
229 : {
230 : /*
231 : * don't ERROR here. We're exiting anyway, and don't want to get into
232 : * infinite loop trying to exit
233 : */
234 0 : elog(LOG, "process %d releasing ProcSignal slot %d, but it contains %d",
235 : MyProcPid, pss_idx, (int) slot->pss_pid);
236 0 : return; /* XXX better to zero the slot anyway? */
237 : }
238 :
239 : /*
240 : * Make this slot look like it's absorbed all possible barriers, so that
241 : * no barrier waits block on it.
242 : */
243 18504 : pg_atomic_write_u64(&slot->pss_barrierGeneration, PG_UINT64_MAX);
244 18504 : ConditionVariableBroadcast(&slot->pss_barrierCV);
245 :
246 18504 : slot->pss_pid = 0;
247 : }
248 :
249 : /*
250 : * SendProcSignal
251 : * Send a signal to a Postgres process
252 : *
253 : * Providing backendId is optional, but it will speed up the operation.
254 : *
255 : * On success (a signal was sent), zero is returned.
256 : * On error, -1 is returned, and errno is set (typically to ESRCH or EPERM).
257 : *
258 : * Not to be confused with ProcSendSignal
259 : */
260 : int
261 8356 : SendProcSignal(pid_t pid, ProcSignalReason reason, BackendId backendId)
262 : {
263 : volatile ProcSignalSlot *slot;
264 :
265 8356 : if (backendId != InvalidBackendId)
266 : {
267 8312 : slot = &ProcSignal->psh_slot[backendId - 1];
268 :
269 : /*
270 : * Note: Since there's no locking, it's possible that the target
271 : * process detaches from shared memory and exits right after this
272 : * test, before we set the flag and send signal. And the signal slot
273 : * might even be recycled by a new process, so it's remotely possible
274 : * that we set a flag for a wrong process. That's OK, all the signals
275 : * are such that no harm is done if they're mistakenly fired.
276 : */
277 8312 : if (slot->pss_pid == pid)
278 : {
279 : /* Atomically set the proper flag */
280 8312 : slot->pss_signalFlags[reason] = true;
281 : /* Send signal */
282 8312 : return kill(pid, SIGUSR1);
283 : }
284 : }
285 : else
286 : {
287 : /*
288 : * BackendId not provided, so search the array using pid. We search
289 : * the array back to front so as to reduce search overhead. Passing
290 : * InvalidBackendId means that the target is most likely an auxiliary
291 : * process, which will have a slot near the end of the array.
292 : */
293 : int i;
294 :
295 1552 : for (i = NumProcSignalSlots - 1; i >= 0; i--)
296 : {
297 1552 : slot = &ProcSignal->psh_slot[i];
298 :
299 1552 : if (slot->pss_pid == pid)
300 : {
301 : /* the above note about race conditions applies here too */
302 :
303 : /* Atomically set the proper flag */
304 44 : slot->pss_signalFlags[reason] = true;
305 : /* Send signal */
306 44 : return kill(pid, SIGUSR1);
307 : }
308 : }
309 : }
310 :
311 0 : errno = ESRCH;
312 0 : return -1;
313 : }
314 :
315 : /*
316 : * EmitProcSignalBarrier
317 : * Send a signal to every Postgres process
318 : *
319 : * The return value of this function is the barrier "generation" created
320 : * by this operation. This value can be passed to WaitForProcSignalBarrier
321 : * to wait until it is known that every participant in the ProcSignal
322 : * mechanism has absorbed the signal (or started afterwards).
323 : *
324 : * Note that it would be a bad idea to use this for anything that happens
325 : * frequently, as interrupting every backend could cause a noticeable
326 : * performance hit.
327 : *
328 : * Callers are entitled to assume that this function will not throw ERROR
329 : * or FATAL.
330 : */
331 : uint64
332 0 : EmitProcSignalBarrier(ProcSignalBarrierType type)
333 : {
334 0 : uint32 flagbit = 1 << (uint32) type;
335 : uint64 generation;
336 :
337 : /*
338 : * Set all the flags.
339 : *
340 : * Note that pg_atomic_fetch_or_u32 has full barrier semantics, so this is
341 : * totally ordered with respect to anything the caller did before, and
342 : * anything that we do afterwards. (This is also true of the later call to
343 : * pg_atomic_add_fetch_u64.)
344 : */
345 0 : for (int i = 0; i < NumProcSignalSlots; i++)
346 : {
347 0 : volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
348 :
349 0 : pg_atomic_fetch_or_u32(&slot->pss_barrierCheckMask, flagbit);
350 : }
351 :
352 : /*
353 : * Increment the generation counter.
354 : */
355 : generation =
356 0 : pg_atomic_add_fetch_u64(&ProcSignal->psh_barrierGeneration, 1);
357 :
358 : /*
359 : * Signal all the processes, so that they update their advertised barrier
360 : * generation.
361 : *
362 : * Concurrency is not a problem here. Backends that have exited don't
363 : * matter, and new backends that have joined since we entered this
364 : * function must already have current state, since the caller is
365 : * responsible for making sure that the relevant state is entirely visible
366 : * before calling this function in the first place. We still have to wake
367 : * them up - because we can't distinguish between such backends and older
368 : * backends that need to update state - but they won't actually need to
369 : * change any state.
370 : */
371 0 : for (int i = NumProcSignalSlots - 1; i >= 0; i--)
372 : {
373 0 : volatile ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
374 0 : pid_t pid = slot->pss_pid;
375 :
376 0 : if (pid != 0)
377 : {
378 : /* see SendProcSignal for details */
379 0 : slot->pss_signalFlags[PROCSIG_BARRIER] = true;
380 0 : kill(pid, SIGUSR1);
381 : }
382 : }
383 :
384 0 : return generation;
385 : }
386 :
387 : /*
388 : * WaitForProcSignalBarrier - wait until it is guaranteed that all changes
389 : * requested by a specific call to EmitProcSignalBarrier() have taken effect.
390 : */
391 : void
392 0 : WaitForProcSignalBarrier(uint64 generation)
393 : {
394 : Assert(generation <= pg_atomic_read_u64(&ProcSignal->psh_barrierGeneration));
395 :
396 0 : for (int i = NumProcSignalSlots - 1; i >= 0; i--)
397 : {
398 0 : ProcSignalSlot *slot = &ProcSignal->psh_slot[i];
399 : uint64 oldval;
400 :
401 : /*
402 : * It's important that we check only pss_barrierGeneration here and
403 : * not pss_barrierCheckMask. Bits in pss_barrierCheckMask get cleared
404 : * before the barrier is actually absorbed, but pss_barrierGeneration
405 : * is updated only afterward.
406 : */
407 0 : oldval = pg_atomic_read_u64(&slot->pss_barrierGeneration);
408 0 : while (oldval < generation)
409 : {
410 0 : ConditionVariableSleep(&slot->pss_barrierCV,
411 : WAIT_EVENT_PROC_SIGNAL_BARRIER);
412 0 : oldval = pg_atomic_read_u64(&slot->pss_barrierGeneration);
413 : }
414 0 : ConditionVariableCancelSleep();
415 : }
416 :
417 : /*
418 : * The caller is probably calling this function because it wants to read
419 : * the shared state or perform further writes to shared state once all
420 : * backends are known to have absorbed the barrier. However, the read of
421 : * pss_barrierGeneration was performed unlocked; insert a memory barrier
422 : * to separate it from whatever follows.
423 : */
424 0 : pg_memory_barrier();
425 0 : }
426 :
427 : /*
428 : * Handle receipt of an interrupt indicating a global barrier event.
429 : *
430 : * All the actual work is deferred to ProcessProcSignalBarrier(), because we
431 : * cannot safely access the barrier generation inside the signal handler as
432 : * 64bit atomics might use spinlock based emulation, even for reads. As this
433 : * routine only gets called when PROCSIG_BARRIER is sent that won't cause a
434 : * lot of unnecessary work.
435 : */
436 : static void
437 0 : HandleProcSignalBarrierInterrupt(void)
438 : {
439 0 : InterruptPending = true;
440 0 : ProcSignalBarrierPending = true;
441 : /* latch will be set by procsignal_sigusr1_handler */
442 0 : }
443 :
444 : /*
445 : * Perform global barrier related interrupt checking.
446 : *
447 : * Any backend that participates in ProcSignal signaling must arrange to
448 : * call this function periodically. It is called from CHECK_FOR_INTERRUPTS(),
449 : * which is enough for normal backends, but not necessarily for all types of
450 : * background processes.
451 : */
452 : void
453 0 : ProcessProcSignalBarrier(void)
454 : {
455 : uint64 local_gen;
456 : uint64 shared_gen;
457 : volatile uint32 flags;
458 :
459 : Assert(MyProcSignalSlot);
460 :
461 : /* Exit quickly if there's no work to do. */
462 0 : if (!ProcSignalBarrierPending)
463 0 : return;
464 0 : ProcSignalBarrierPending = false;
465 :
466 : /*
467 : * It's not unlikely to process multiple barriers at once, before the
468 : * signals for all the barriers have arrived. To avoid unnecessary work in
469 : * response to subsequent signals, exit early if we already have processed
470 : * all of them.
471 : */
472 0 : local_gen = pg_atomic_read_u64(&MyProcSignalSlot->pss_barrierGeneration);
473 0 : shared_gen = pg_atomic_read_u64(&ProcSignal->psh_barrierGeneration);
474 :
475 : Assert(local_gen <= shared_gen);
476 :
477 0 : if (local_gen == shared_gen)
478 0 : return;
479 :
480 : /*
481 : * Get and clear the flags that are set for this backend. Note that
482 : * pg_atomic_exchange_u32 is a full barrier, so we're guaranteed that the
483 : * read of the barrier generation above happens before we atomically
484 : * extract the flags, and that any subsequent state changes happen
485 : * afterward.
486 : *
487 : * NB: In order to avoid race conditions, we must zero
488 : * pss_barrierCheckMask first and only afterwards try to do barrier
489 : * processing. If we did it in the other order, someone could send us
490 : * another barrier of some type right after we called the
491 : * barrier-processing function but before we cleared the bit. We would
492 : * have no way of knowing that the bit needs to stay set in that case, so
493 : * the need to call the barrier-processing function again would just get
494 : * forgotten. So instead, we tentatively clear all the bits and then put
495 : * back any for which we don't manage to successfully absorb the barrier.
496 : */
497 0 : flags = pg_atomic_exchange_u32(&MyProcSignalSlot->pss_barrierCheckMask, 0);
498 :
499 : /*
500 : * If there are no flags set, then we can skip doing any real work.
501 : * Otherwise, establish a PG_TRY block, so that we don't lose track of
502 : * which types of barrier processing are needed if an ERROR occurs.
503 : */
504 0 : if (flags != 0)
505 : {
506 0 : bool success = true;
507 :
508 0 : PG_TRY();
509 : {
510 : /*
511 : * Process each type of barrier. The barrier-processing functions
512 : * should normally return true, but may return false if the
513 : * barrier can't be absorbed at the current time. This should be
514 : * rare, because it's pretty expensive. Every single
515 : * CHECK_FOR_INTERRUPTS() will return here until we manage to
516 : * absorb the barrier, and that cost will add up in a hurry.
517 : *
518 : * NB: It ought to be OK to call the barrier-processing functions
519 : * unconditionally, but it's more efficient to call only the ones
520 : * that might need us to do something based on the flags.
521 : */
522 0 : while (flags != 0)
523 : {
524 : ProcSignalBarrierType type;
525 0 : bool processed = true;
526 :
527 0 : type = (ProcSignalBarrierType) pg_rightmost_one_pos32(flags);
528 0 : switch (type)
529 : {
530 0 : case PROCSIGNAL_BARRIER_PLACEHOLDER:
531 0 : processed = ProcessBarrierPlaceholder();
532 0 : break;
533 : }
534 :
535 : /*
536 : * To avoid an infinite loop, we must always unset the bit in
537 : * flags.
538 : */
539 0 : BARRIER_CLEAR_BIT(flags, type);
540 :
541 : /*
542 : * If we failed to process the barrier, reset the shared bit
543 : * so we try again later, and set a flag so that we don't bump
544 : * our generation.
545 : */
546 0 : if (!processed)
547 : {
548 0 : ResetProcSignalBarrierBits(((uint32) 1) << type);
549 0 : success = false;
550 : }
551 : }
552 : }
553 0 : PG_CATCH();
554 : {
555 : /*
556 : * If an ERROR occurred, we'll need to try again later to handle
557 : * that barrier type and any others that haven't been handled yet
558 : * or weren't successfully absorbed.
559 : */
560 0 : ResetProcSignalBarrierBits(flags);
561 0 : PG_RE_THROW();
562 : }
563 0 : PG_END_TRY();
564 :
565 : /*
566 : * If some barrier types were not successfully absorbed, we will have
567 : * to try again later.
568 : */
569 0 : if (!success)
570 0 : return;
571 : }
572 :
573 : /*
574 : * State changes related to all types of barriers that might have been
575 : * emitted have now been handled, so we can update our notion of the
576 : * generation to the one we observed before beginning the updates. If
577 : * things have changed further, it'll get fixed up when this function is
578 : * next called.
579 : */
580 0 : pg_atomic_write_u64(&MyProcSignalSlot->pss_barrierGeneration, shared_gen);
581 0 : ConditionVariableBroadcast(&MyProcSignalSlot->pss_barrierCV);
582 : }
583 :
584 : /*
585 : * If it turns out that we couldn't absorb one or more barrier types, either
586 : * because the barrier-processing functions returned false or due to an error,
587 : * arrange for processing to be retried later.
588 : */
589 : static void
590 0 : ResetProcSignalBarrierBits(uint32 flags)
591 : {
592 0 : pg_atomic_fetch_or_u32(&MyProcSignalSlot->pss_barrierCheckMask, flags);
593 0 : ProcSignalBarrierPending = true;
594 0 : InterruptPending = true;
595 0 : }
596 :
597 : static bool
598 0 : ProcessBarrierPlaceholder(void)
599 : {
600 : /*
601 : * XXX. This is just a placeholder until the first real user of this
602 : * machinery gets committed. Rename PROCSIGNAL_BARRIER_PLACEHOLDER to
603 : * PROCSIGNAL_BARRIER_SOMETHING_ELSE where SOMETHING_ELSE is something
604 : * appropriately descriptive. Get rid of this function and instead have
605 : * ProcessBarrierSomethingElse. Most likely, that function should live in
606 : * the file pertaining to that subsystem, rather than here.
607 : *
608 : * The return value should be 'true' if the barrier was successfully
609 : * absorbed and 'false' if not. Note that returning 'false' can lead to
610 : * very frequent retries, so try hard to make that an uncommon case.
611 : */
612 0 : return true;
613 : }
614 :
615 : /*
616 : * CheckProcSignal - check to see if a particular reason has been
617 : * signaled, and clear the signal flag. Should be called after receiving
618 : * SIGUSR1.
619 : */
620 : static bool
621 145896 : CheckProcSignal(ProcSignalReason reason)
622 : {
623 145896 : volatile ProcSignalSlot *slot = MyProcSignalSlot;
624 :
625 145896 : if (slot != NULL)
626 : {
627 : /* Careful here --- don't clear flag if we haven't seen it set */
628 145872 : if (slot->pss_signalFlags[reason])
629 : {
630 7400 : slot->pss_signalFlags[reason] = false;
631 7400 : return true;
632 : }
633 : }
634 :
635 138496 : return false;
636 : }
637 :
638 : /*
639 : * procsignal_sigusr1_handler - handle SIGUSR1 signal.
640 : */
641 : void
642 12158 : procsignal_sigusr1_handler(SIGNAL_ARGS)
643 : {
644 12158 : int save_errno = errno;
645 :
646 12158 : if (CheckProcSignal(PROCSIG_CATCHUP_INTERRUPT))
647 3168 : HandleCatchupInterrupt();
648 :
649 12158 : if (CheckProcSignal(PROCSIG_NOTIFY_INTERRUPT))
650 20 : HandleNotifyInterrupt();
651 :
652 12158 : if (CheckProcSignal(PROCSIG_PARALLEL_MESSAGE))
653 4160 : HandleParallelMessageInterrupt();
654 :
655 12158 : if (CheckProcSignal(PROCSIG_WALSND_INIT_STOPPING))
656 44 : HandleWalSndInitStopping();
657 :
658 12158 : if (CheckProcSignal(PROCSIG_BARRIER))
659 0 : HandleProcSignalBarrierInterrupt();
660 :
661 12158 : if (CheckProcSignal(PROCSIG_LOG_MEMORY_CONTEXT))
662 8 : HandleLogMemoryContextInterrupt();
663 :
664 12158 : if (CheckProcSignal(PROCSIG_RECOVERY_CONFLICT_DATABASE))
665 0 : RecoveryConflictInterrupt(PROCSIG_RECOVERY_CONFLICT_DATABASE);
666 :
667 12158 : if (CheckProcSignal(PROCSIG_RECOVERY_CONFLICT_TABLESPACE))
668 0 : RecoveryConflictInterrupt(PROCSIG_RECOVERY_CONFLICT_TABLESPACE);
669 :
670 12158 : if (CheckProcSignal(PROCSIG_RECOVERY_CONFLICT_LOCK))
671 0 : RecoveryConflictInterrupt(PROCSIG_RECOVERY_CONFLICT_LOCK);
672 :
673 12158 : if (CheckProcSignal(PROCSIG_RECOVERY_CONFLICT_SNAPSHOT))
674 0 : RecoveryConflictInterrupt(PROCSIG_RECOVERY_CONFLICT_SNAPSHOT);
675 :
676 12158 : if (CheckProcSignal(PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK))
677 0 : RecoveryConflictInterrupt(PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK);
678 :
679 12158 : if (CheckProcSignal(PROCSIG_RECOVERY_CONFLICT_BUFFERPIN))
680 0 : RecoveryConflictInterrupt(PROCSIG_RECOVERY_CONFLICT_BUFFERPIN);
681 :
682 12158 : SetLatch(MyLatch);
683 :
684 12158 : errno = save_errno;
685 12158 : }
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