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Commitfd71421

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Improve tests for postmaster death in auxiliary processes.
In checkpointer and walwriter, avoid calling PostmasterIsAlive unlessWaitLatch has reported WL_POSTMASTER_DEATH. This saves a kernel call periteration of the process's outer loop, which is not all that much, but acycle shaved is a cycle earned. I had already removed the unconditionalPostmasterIsAlive calls in bgwriter and pgstat in previous patches, butforgot that WL_POSTMASTER_DEATH is supposed to be treated as untrustworthy(per comment in unix_latch.c); so adjust those two cases to match.There are a few other places where the same idea might be applied, but onlyafter substantial code rearrangement, so I didn't bother.
1 parente78cc62 commitfd71421

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4 files changed

+37
-24
lines changed

4 files changed

+37
-24
lines changed

‎src/backend/postmaster/bgwriter.c

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -323,9 +323,11 @@ BackgroundWriterMain(void)
323323

324324
/*
325325
* Emergency bailout if postmaster has died. This is to avoid the
326-
* necessity for manual cleanup of all postmaster children.
326+
* necessity for manual cleanup of all postmaster children. Note
327+
* that we mustn't trust the WL_POSTMASTER_DEATH result flag entirely;
328+
* if it is set, recheck with PostmasterIsAlive before believing it.
327329
*/
328-
if (rc&WL_POSTMASTER_DEATH)
330+
if ((rc&WL_POSTMASTER_DEATH)&& !PostmasterIsAlive())
329331
exit(1);
330332

331333
prev_hibernate=can_hibernate;

‎src/backend/postmaster/checkpointer.c

Lines changed: 13 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -374,17 +374,11 @@ CheckpointerMain(void)
374374
pg_time_tnow;
375375
intelapsed_secs;
376376
intcur_timeout;
377+
intrc;
377378

378379
/* Clear any already-pending wakeups */
379380
ResetLatch(&MyProc->procLatch);
380381

381-
/*
382-
* Emergency bailout if postmaster has died. This is to avoid the
383-
* necessity for manual cleanup of all postmaster children.
384-
*/
385-
if (!PostmasterIsAlive())
386-
exit(1);
387-
388382
/*
389383
* Process any requests or signals received recently.
390384
*/
@@ -581,9 +575,18 @@ CheckpointerMain(void)
581575
cur_timeout=Min(cur_timeout,XLogArchiveTimeout-elapsed_secs);
582576
}
583577

584-
(void)WaitLatch(&MyProc->procLatch,
585-
WL_LATCH_SET |WL_TIMEOUT |WL_POSTMASTER_DEATH,
586-
cur_timeout*1000L/* convert to ms */);
578+
rc=WaitLatch(&MyProc->procLatch,
579+
WL_LATCH_SET |WL_TIMEOUT |WL_POSTMASTER_DEATH,
580+
cur_timeout*1000L/* convert to ms */);
581+
582+
/*
583+
* Emergency bailout if postmaster has died. This is to avoid the
584+
* necessity for manual cleanup of all postmaster children. Note
585+
* that we mustn't trust the WL_POSTMASTER_DEATH result flag entirely;
586+
* if it is set, recheck with PostmasterIsAlive before believing it.
587+
*/
588+
if ((rc&WL_POSTMASTER_DEATH)&& !PostmasterIsAlive())
589+
exit(1);
587590
}
588591
}
589592

‎src/backend/postmaster/pgstat.c

Lines changed: 7 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -3225,8 +3225,13 @@ PgstatCollectorMain(int argc, char *argv[])
32253225
pgStatSock,
32263226
-1L);
32273227

3228-
/* Check for postmaster death */
3229-
if (wr&WL_POSTMASTER_DEATH)
3228+
/*
3229+
* Emergency bailout if postmaster has died. This is to avoid the
3230+
* necessity for manual cleanup of all postmaster children. Note
3231+
* that we mustn't trust the WL_POSTMASTER_DEATH result flag entirely;
3232+
* if it is set, recheck with PostmasterIsAlive before believing it.
3233+
*/
3234+
if ((wr&WL_POSTMASTER_DEATH)&& !PostmasterIsAlive())
32303235
break;
32313236
}/* end of outer loop */
32323237

‎src/backend/postmaster/walwriter.c

Lines changed: 13 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -246,6 +246,7 @@ WalWriterMain(void)
246246
for (;;)
247247
{
248248
longcur_timeout;
249+
intrc;
249250

250251
/*
251252
* Advertise whether we might hibernate in this cycle. We do this
@@ -265,13 +266,6 @@ WalWriterMain(void)
265266
/* Clear any already-pending wakeups */
266267
ResetLatch(&MyProc->procLatch);
267268

268-
/*
269-
* Emergency bailout if postmaster has died. This is to avoid the
270-
* necessity for manual cleanup of all postmaster children.
271-
*/
272-
if (!PostmasterIsAlive())
273-
exit(1);
274-
275269
/*
276270
* Process any requests or signals received recently.
277271
*/
@@ -305,9 +299,18 @@ WalWriterMain(void)
305299
else
306300
cur_timeout=WalWriterDelay*HIBERNATE_FACTOR;
307301

308-
(void)WaitLatch(&MyProc->procLatch,
309-
WL_LATCH_SET |WL_TIMEOUT |WL_POSTMASTER_DEATH,
310-
cur_timeout);
302+
rc=WaitLatch(&MyProc->procLatch,
303+
WL_LATCH_SET |WL_TIMEOUT |WL_POSTMASTER_DEATH,
304+
cur_timeout);
305+
306+
/*
307+
* Emergency bailout if postmaster has died. This is to avoid the
308+
* necessity for manual cleanup of all postmaster children. Note
309+
* that we mustn't trust the WL_POSTMASTER_DEATH result flag entirely;
310+
* if it is set, recheck with PostmasterIsAlive before believing it.
311+
*/
312+
if ((rc&WL_POSTMASTER_DEATH)&& !PostmasterIsAlive())
313+
exit(1);
311314
}
312315
}
313316

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