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Use signals for postmaster death on FreeBSD. 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
configure vendored
View File

@ -12494,7 +12494,7 @@ $as_echo "#define HAVE_STDBOOL_H 1" >>confdefs.h
fi
for ac_header in atomic.h crypt.h dld.h fp_class.h getopt.h ieeefp.h ifaddrs.h langinfo.h mbarrier.h poll.h sys/epoll.h sys/ipc.h sys/prctl.h sys/pstat.h sys/resource.h sys/select.h sys/sem.h sys/shm.h sys/sockio.h sys/tas.h sys/un.h termios.h ucred.h utime.h wchar.h wctype.h
for ac_header in atomic.h crypt.h dld.h fp_class.h getopt.h ieeefp.h ifaddrs.h langinfo.h mbarrier.h poll.h sys/epoll.h sys/ipc.h sys/prctl.h sys/procctl.h sys/pstat.h sys/resource.h sys/select.h sys/sem.h sys/shm.h sys/sockio.h sys/tas.h sys/un.h termios.h ucred.h utime.h wchar.h wctype.h
do :
as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"

2
configure.in
View File

@ -1260,7 +1260,7 @@ AC_SUBST(UUID_LIBS)
AC_HEADER_STDBOOL
AC_CHECK_HEADERS([atomic.h crypt.h dld.h fp_class.h getopt.h ieeefp.h ifaddrs.h langinfo.h mbarrier.h poll.h sys/epoll.h sys/ipc.h sys/prctl.h sys/pstat.h sys/resource.h sys/select.h sys/sem.h sys/shm.h sys/sockio.h sys/tas.h sys/un.h termios.h ucred.h utime.h wchar.h wctype.h])
AC_CHECK_HEADERS([atomic.h crypt.h dld.h fp_class.h getopt.h ieeefp.h ifaddrs.h langinfo.h mbarrier.h poll.h sys/epoll.h sys/ipc.h sys/prctl.h sys/procctl.h sys/pstat.h sys/resource.h sys/select.h sys/sem.h sys/shm.h sys/sockio.h sys/tas.h sys/un.h termios.h ucred.h utime.h wchar.h wctype.h])
# On BSD, test for net/if.h will fail unless sys/socket.h
# is included first.

3
src/backend/storage/ipc/pmsignal.c
View File

@ -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

3
src/include/pg_config.h.in
View File

@ -603,6 +603,9 @@
/* Define to 1 if you have the <sys/prctl.h> header file. */
#undef HAVE_SYS_PRCTL_H
/* Define to 1 if you have the <sys/procctl.h> header file. */
#undef HAVE_SYS_PROCCTL_H
/* Define to 1 if you have the <sys/pstat.h> header file. */
#undef HAVE_SYS_PSTAT_H

7
src/include/storage/pmsignal.h
View File

@ -18,6 +18,10 @@
#include "sys/prctl.h"
#endif
#ifdef HAVE_SYS_PROCCTL_H
#include "sys/procctl.h"
#endif
/*
* Reasons for signaling the postmaster. We can cope with simultaneous
* signals for different reasons. If the same reason is signaled multiple
@ -66,7 +70,8 @@ extern void PostmasterDeathSignalInit(void);
* the parent dies. Checking the flag first makes PostmasterIsAlive() a lot
* cheaper in usual case that the postmaster is alive.
*/
#if defined(HAVE_SYS_PRCTL_H) && defined(PR_SET_PDEATHSIG)
#if (defined(HAVE_SYS_PRCTL_H) && defined(PR_SET_PDEATHSIG)) || \
(defined(HAVE_SYS_PROCCTL_H) && defined(PROC_PDEATHSIG_CTL))
#define USE_POSTMASTER_DEATH_SIGNAL
#endif