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Allow libc's version of sem_trywait() to work for non-pshared mutexes.

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This commit is contained in:
Daniel Eischen 2004-02-04 15:37:48 +00:00
parent d17387acd4
commit 903f2e5041
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=125446
1 changed files with 17 additions and 2 deletions
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19
lib/libc/gen/sem.c
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@ -289,17 +289,32 @@ __sem_wait(sem_t *sem)
if (sem_check_validity(sem) != 0)
return (-1);
return (ksem_wait((*sem)->semid));
return (ksem_wait((*sem)->semid));
}
int
__sem_trywait(sem_t *sem)
{
int retval;
if (sem_check_validity(sem) != 0)
return (-1);
return (ksem_trywait((*sem)->semid));
if ((*sem)->syssem != 0)
retval = ksem_trywait((*sem)->semid);
else {
_pthread_mutex_lock(&(*sem)->lock);
if ((*sem)->count != 0) {
(*sem)->count--;
retval = 0;
} else {
errno = EAGAIN;
retval = -1;
}
(*sem)->count--;
_pthread_mutex_unlock(&(*sem)->lock);
}
return (retval);
}
int