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On Darwin, detect and report a multithreaded postmaster.

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Darwin --enable-nls builds use a substitute setlocale() that may start a
thread.  Buildfarm member orangutan experienced BackendList corruption
on account of different postmaster threads executing signal handlers
simultaneously.  Furthermore, a multithreaded postmaster risks undefined
behavior from sigprocmask() and fork().  Emit LOG messages about the
problem and its workaround.  Back-patch to 9.0 (all supported versions).
This commit is contained in:
Noah Misch
2015-01-07 22:35:44 -05:00
parent 3580397fb1
commit 2e4946169d
5 changed files with 61 additions and 2 deletions
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3
configure vendored
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@ -18839,7 +18839,8 @@ LIBS=`echo "$LIBS" | sed -e 's/-ledit//g' -e 's/-lreadline//g'`
for ac_func in cbrt dlopen fcvt fdatasync getifaddrs getpeereid getpeerucred getrlimit memmove poll pstat readlink scandir setproctitle setsid sigprocmask symlink sysconf towlower utime utimes waitpid wcstombs
for ac_func in cbrt dlopen fcvt fdatasync getifaddrs getpeereid getpeerucred getrlimit memmove poll pstat pthread_is_threaded_np readlink scandir setproctitle setsid sigprocmask symlink sysconf towlower utime utimes waitpid wcstombs
do
as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
{ $as_echo "$as_me:$LINENO: checking for $ac_func" >&5