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Commitd0410d6

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Eliminate one background-worker-related flag variable.
Teach sigusr1_handler() to use the same test for whether a workermight need to be started as ServerLoop(). Aside from being perhapsa bit simpler, this prevents a potentially-unbounded delay whenstarting a background worker. On some platforms, select() doesn'treturn when interrupted by a signal, but is instead restarted,including a reset of the timeout to the originally-requested value.If signals arrive often enough, but no connection requests arrive,sigusr1_handler() will be executed repeatedly, but the body ofServerLoop() won't be reached. This change ensures that, even inthat case, background workers will eventually get launched.This is far from a perfect fix; really, we need select() to returncontrol to ServerLoop() after an interrupt, either via the self-pipetrick or some other mechanism. But that's going to require morework and discussion, so let's do this for now to at least mitigatethe damage.Per investigation of test_shm_mq failures on buildfarm member anole.
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‎src/backend/postmaster/postmaster.c

Lines changed: 3 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -4752,15 +4752,14 @@ static void
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sigusr1_handler(SIGNAL_ARGS)
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{
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intsave_errno=errno;
4755-
boolstart_bgworker= false;
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PG_SETMASK(&BlockSig);
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/* Process background worker state change. */
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if (CheckPostmasterSignal(PMSIGNAL_BACKGROUND_WORKER_CHANGE))
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{
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BackgroundWorkerStateChange();
4763-
start_bgworker= true;
4762+
StartWorkerNeeded= true;
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}
47654764

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/*
@@ -4801,10 +4800,10 @@ sigusr1_handler(SIGNAL_ARGS)
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pmState=PM_HOT_STANDBY;
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/* Some workers may be scheduled to start now */
4804-
start_bgworker= true;
4803+
StartWorkerNeeded= true;
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}
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4807-
if (start_bgworker)
4806+
if (StartWorkerNeeded||HaveCrashedWorker)
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maybe_start_bgworker();
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48104809
if (CheckPostmasterSignal(PMSIGNAL_WAKEN_ARCHIVER)&&

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