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upipe-pthread: add umutex_pthread_trylock #1167

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upipe-pthread: add umutex_pthread_trylock #1167

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7 changes: 7 additions & 0 deletions include/upipe-pthread/umutex_pthread.h
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,13 @@ extern "C" {
*/
struct umutex *umutex_pthread_alloc(const pthread_mutexattr_t *mutexattr);

/** @This tries to lock a mutex.
*
* @param umutex pointer to a umutex structure
* @return an error code, UBASE_ERR_BUSY for EBUSY
*/
int umutex_pthread_trylock(struct umutex *umutex);

#ifdef __cplusplus
}
#endif
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17 changes: 17 additions & 0 deletions lib/upipe-pthread/umutex_pthread.c
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,23 @@ static inline int umutex_pthread_lock(struct umutex *umutex)
}
}

/** @This tries to lock a mutex.
*
* @param umutex pointer to a umutex structure
* @return an error code, UBASE_ERR_BUSY for EBUSY
*/
int umutex_pthread_trylock(struct umutex *umutex)
{
struct umutex_pthread *umutex_pthread = umutex_pthread_from_umutex(umutex);
int err = pthread_mutex_trylock(&umutex_pthread->mutex);
switch (err) {
case 0: return UBASE_ERR_NONE;
case EBUSY: return UBASE_ERR_BUSY;
default:
case EINVAL: return UBASE_ERR_INVALID;
}
}

/** @This unlocks a mutex.
*
* @param umutex pointer to a umutex structure
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