Use a WaitLatch for vacuum/autovacuum sleeping
Instead of using pg_usleep() in vacuum_delay_point(), use a WaitLatch. This has the advantage that we will realize if the postmaster has been killed since the last time we decided to sleep while vacuuming. Reviewed-by: Thomas Munro Discussion: https://postgr.es/m/CAFh8B=kcdk8k-Y21RfXPu5dX=bgPqJ8TC3p_qxR_ygdBS=JN5w@mail.gmail.com
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@ -2080,9 +2080,11 @@ vacuum_delay_point(void)
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if (msec > VacuumCostDelay * 4)
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msec = VacuumCostDelay * 4;
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pgstat_report_wait_start(WAIT_EVENT_VACUUM_DELAY);
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pg_usleep((long) (msec * 1000));
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pgstat_report_wait_end();
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(void) WaitLatch(MyLatch,
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WL_LATCH_SET | WL_TIMEOUT | WL_EXIT_ON_PM_DEATH,
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msec,
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WAIT_EVENT_VACUUM_DELAY);
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ResetLatch(MyLatch);
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VacuumCostBalance = 0;
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