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Use signals for postmaster death on FreeBSD.

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Use FreeBSD 11.2's new support for detecting parent process death to
make PostmasterIsAlive() very cheap, as was done for Linux in an
earlier commit.

Author: Thomas Munro
Discussion: https://postgr.es/m/7261eb39-0369-f2f4-1bb5-62f3b6083b5e@iki.fi
This commit is contained in:
Thomas Munro
2018-07-11 12:47:42 +12:00
parent 9f09529952
commit f98b8476cd
5 changed files with 14 additions and 3 deletions
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3
src/backend/storage/ipc/pmsignal.c
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@ -379,6 +379,9 @@ PostmasterDeathSignalInit(void)
#if defined(PR_SET_PDEATHSIG)
if (prctl(PR_SET_PDEATHSIG, signum) < 0)
elog(ERROR, "could not request parent death signal: %m");
#elif defined(PROC_PDEATHSIG_CTL)
if (procctl(P_PID, 0, PROC_PDEATHSIG_CTL, &signum) < 0)
elog(ERROR, "could not request parent death signal: %m");
#else
#error "USE_POSTMASTER_DEATH_SIGNAL set, but there is no mechanism to request the signal"
#endif