diff options
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/gen/sem.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/lib/libc/gen/sem.c b/lib/libc/gen/sem.c index 5ab7817..a6c0dde 100644 --- a/lib/libc/gen/sem.c +++ b/lib/libc/gen/sem.c @@ -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 |
