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/*
* Copyright (C) 2014 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup pthread
* @{
* @file
* @brief Mutual exclusion.
* @note Do not include this header file directly, but pthread.h.
*/
#ifndef SYS__POSIX__PTHREAD_MUTEX__H
#define SYS__POSIX__PTHREAD_MUTEX__H
#include <time.h>
#include "mutex.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Pthread mutexes are quite the same as RIOT mutexes.
* @details Recursive locking is not supported.
* A thread can unlock a mutex even if it does not hold it.
*/
typedef mutex_t pthread_mutex_t;
/**
* @brief Initialize a mutex.
* @details A zeroed out datum is initialized.
* @param[in,out] mutex Mutex to initialize.
* @param[in] mutexattr Unused.
* @returns `0` on success. `-1` iff `mutex == NULL`.
*/
int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *mutexattr);
/**
* @brief Destroy a mutex.
* @details This is currently a no-op.
* Destroying a mutex locked is undefined behavior.
* @param[in,out] mutex Datum to destroy.
* @returns 0, this invocation is a no-op that cannot fail.
*/
int pthread_mutex_destroy(pthread_mutex_t *mutex);
/**
* @brief Try to lock a mutex.
* @details This function won't block.
* @param[in] mutex Mutex to lock, must be initialized.
* @returns `0` if you hold the mutex now.
* `+1` if the mutex already was locked.
* `-1` if you managed to supply `NULL`.
*/
int pthread_mutex_trylock(pthread_mutex_t *mutex);
/**
* @brief Lock and hold a mutex.
* @details This invocation may block if the mutex was locked.
* @param[in] mutex Mutex to lock, must be initialized.
* @returns `-1` iff you managed to supply `NULL`.
* `0` otherwise, you hold the mutex now.
*/
int pthread_mutex_lock(pthread_mutex_t *mutex);
/**
* @brief Not implemented, yet.
* @details Will cause a linktime error ...
* @param[in] mutex The unused mutex.
* @param[in] abstime The used absolute time.
* @return Well ... you'll get a link time error, so nothing will be returned.
*/
int pthread_mutex_timedlock(pthread_mutex_t *mutex, const struct timespec *abstime);
/**
* @brief Unlock a mutex.
* @details It is possible to unlock a mutex that you don't hold.
* It is possible to unlock a mutex that is not held at all.
* The mutex can still be locked afterwards if there were threads queuing for this mutex.
* @param[in] mutex Mutex to unlock, must be initialized.
* @returns `-1` iff you managed to supply `NULL`.
* `0` otherwise.
*/
int pthread_mutex_unlock(pthread_mutex_t *mutex);
/**
* @brief Not implemented, yet.
* @details Will cause a linktime error ...
* @param[in] mutex The unused mutex.
* @param[out] prioceiling Unused.
* @return Well ... you'll get a link time error, so nothing will be returned.
*/
int pthread_mutex_getprioceiling(const pthread_mutex_t *mutex, int *prioceiling);
/**
* @brief Not implemented, yet.
* @details Will cause a linktime error ...
* @param[in,out] mutex The unused mutex.
* @param[in] prioceiling Unused.
* @param[out] old_ceiling Unused.
* @return Well ... you'll get a link time error, so nothing will be returned.
*/
int pthread_mutex_setprioceiling(pthread_mutex_t *mutex, int prioceiling, int *old_ceiling);
#ifdef __cplusplus
}
#endif
#endif /* SYS__POSIX__PTHREAD_MUTEX__H */
/**
* @}
*/
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