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Make semaphore names list mutex non-recursive.

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The mutex is used in sem_open() and sem_close(), which cannot
recurse. The atfork handlers cannot collide with the open and close
code.

Reviewed by:	vangyzen
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D10545
This commit is contained in:
kib 2017-04-30 19:37:45 +00:00
parent a52baa12b5
commit 4f018956bb
1 changed files with 1 additions and 5 deletions
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6
lib/libc/gen/sem_new.c
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@ -104,12 +104,8 @@ sem_child_postfork(void)
static void
sem_module_init(void)
{
pthread_mutexattr_t ma;
_pthread_mutexattr_init(&ma);
_pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_RECURSIVE);
_pthread_mutex_init(&sem_llock, &ma);
_pthread_mutexattr_destroy(&ma);
_pthread_mutex_init(&sem_llock, NULL);
_pthread_atfork(sem_prefork, sem_postfork, sem_child_postfork);
}