diff options
Diffstat (limited to 'semaphore.c')
| -rw-r--r-- | semaphore.c | 61 |
1 files changed, 60 insertions, 1 deletions
diff --git a/semaphore.c b/semaphore.c index 8ab326b..fc24b1a 100644 --- a/semaphore.c +++ b/semaphore.c @@ -203,7 +203,7 @@ sem_wait (sem_t * sem) * a signal. * * RESULTS - * 0 successfully destroyed semaphore, + * 0 successfully decreased semaphore, * EINVAL 'sem' is not a valid semaphore, * ENOSYS semaphores are not supported, * EINTR the function was interrupted by a signal, @@ -222,6 +222,65 @@ sem_wait (sem_t * sem) int +_pthread_sem_timedwait (sem_t * sem, const struct timespec * abstime) + /* + * ------------------------------------------------------ + * DOCPUBLIC + * This function waits on a semaphore for at most + * 'abstime'. + * + * PARAMETERS + * sem + * pointer to an instance of sem_t + * + * abstime + * pointer to an instance of struct timespec + * + * DESCRIPTION + * This function waits on a semaphore. If the + * semaphore value is greater than zero, it decreases + * its value by one. If the semaphore value is zero, then + * the calling thread (or process) is blocked until it can + * successfully decrease the value or until interrupted by + * a signal. + * + * If 'abstime' is a NULL pointer then this function will + * block until it can successfully decrease the value or + * until interrupted by a signal. + * + * RESULTS + * 0 successfully decreased semaphore, + * EINVAL 'sem' is not a valid semaphore, + * ENOSYS semaphores are not supported, + * EINTR the function was interrupted by a signal, + * EDEADLK a deadlock condition was detected. + * ETIMEDOUT abstime elapsed before success. + * + * ------------------------------------------------------ + */ +{ + DWORD msecs; + + if (abstime == NULL) + { + msecs = INFINITE; + } + else + { + /* Calculate the number of milliseconds in abstime. */ + msecs = abstime->tv_sec * 1000; + msecs += abstime->tv_nsec / 1000000; + } + + return ((sem == NULL) + ? EINVAL + : pthreadCancelableWait (*sem, msecs) + ); + +} /* sem_wait */ + + +int sem_post (sem_t * sem) /* * ------------------------------------------------------ |