diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/postmaster/postmaster.c | 43 | ||||
| -rw-r--r-- | src/include/pg_config.h.in | 3 | ||||
| -rw-r--r-- | src/port/exec.c | 12 |
3 files changed, 58 insertions, 0 deletions
diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c index 41c4b41a945..41eb1327a7d 100644 --- a/src/backend/postmaster/postmaster.c +++ b/src/backend/postmaster/postmaster.c @@ -92,6 +92,10 @@ #include <dns_sd.h> #endif +#ifdef HAVE_PTHREAD_IS_THREADED_NP +#include <pthread.h> +#endif + #include "access/transam.h" #include "access/xlog.h" #include "bootstrap/bootstrap.h" @@ -1105,6 +1109,24 @@ PostmasterMain(int argc, char *argv[]) */ RemovePgTempFiles(); +#ifdef HAVE_PTHREAD_IS_THREADED_NP + + /* + * On Darwin, libintl replaces setlocale() with a version that calls + * CFLocaleCopyCurrent() when its second argument is "" and every relevant + * environment variable is unset or empty. CFLocaleCopyCurrent() makes + * the process multithreaded. The postmaster calls sigprocmask() and + * calls fork() without an immediate exec(), both of which have undefined + * behavior in a multithreaded program. A multithreaded postmaster is the + * normal case on Windows, which offers neither fork() nor sigprocmask(). + */ + if (pthread_is_threaded_np() != 0) + ereport(LOG, + (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE), + errmsg("postmaster became multithreaded during startup"), + errhint("Set the LC_ALL environment variable to a valid locale."))); +#endif + /* * Remember postmaster startup time */ @@ -1535,6 +1557,15 @@ ServerLoop(void) TouchSocketLockFile(); last_touch_time = now; } + +#ifdef HAVE_PTHREAD_IS_THREADED_NP + + /* + * With assertions enabled, check regularly for appearance of + * additional threads. All builds check at start and exit. + */ + Assert(pthread_is_threaded_np() == 0); +#endif } } @@ -4209,6 +4240,18 @@ SubPostmasterMain(int argc, char *argv[]) static void ExitPostmaster(int status) { +#ifdef HAVE_PTHREAD_IS_THREADED_NP + + /* + * There is no known cause for a postmaster to become multithreaded after + * startup. Recheck to account for the possibility of unknown causes. + */ + if (pthread_is_threaded_np() != 0) + ereport(LOG, + (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE), + errmsg("postmaster became multithreaded"))); +#endif + /* should cleanup shared memory and kill all backends */ /* diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in index 3ce73698ae9..c09e0ed021e 100644 --- a/src/include/pg_config.h.in +++ b/src/include/pg_config.h.in @@ -393,6 +393,9 @@ /* Define if you have POSIX threads libraries and header files. */ #undef HAVE_PTHREAD +/* Define to 1 if you have the `pthread_is_threaded_np' function. */ +#undef HAVE_PTHREAD_IS_THREADED_NP + /* Define to 1 if you have the <pwd.h> header file. */ #undef HAVE_PWD_H diff --git a/src/port/exec.c b/src/port/exec.c index cc32077badd..863ccd23076 100644 --- a/src/port/exec.c +++ b/src/port/exec.c @@ -570,8 +570,20 @@ set_pglocale_pgservice(const char *argv0, const char *app) /* don't set LC_ALL in the backend */ if (strcmp(app, PG_TEXTDOMAIN("postgres")) != 0) + { setlocale(LC_ALL, ""); + /* + * One could make a case for reproducing here PostmasterMain()'s test + * for whether the process is multithreaded. Unlike the postmaster, + * no frontend program calls sigprocmask() or otherwise provides for + * mutual exclusion between signal handlers. While frontends using + * fork(), if multithreaded, are formally exposed to undefined + * behavior, we have not witnessed a concrete bug. Therefore, + * complaining about multithreading here may be mere pedantry. + */ + } + if (find_my_exec(argv0, my_exec_path) < 0) return; |