mirror of
https://github.com/RIOT-OS/RIOT.git
synced 2025-01-18 12:52:44 +01:00
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2013, 2014 Freie Universität Berlin
|
|
*
|
|
* This file subject to the terms and conditions of the GNU Lesser General
|
|
* Public License. See the file LICENSE in the top level directory for more
|
|
* details.
|
|
*/
|
|
|
|
/**
|
|
* @defgroup core_sync Synchronization
|
|
* @brief Mutex for thread synchronization
|
|
* @ingroup core
|
|
* @{
|
|
*
|
|
* @file mutex.h
|
|
* @brief RIOT synchronization API
|
|
*
|
|
* @author Kaspar Schleiser <kaspar@schleiser.de>
|
|
*/
|
|
|
|
#ifndef __MUTEX_H_
|
|
#define __MUTEX_H_
|
|
|
|
#include "queue.h"
|
|
|
|
/**
|
|
* @brief Mutex structure. Must never be modified by the user.
|
|
*/
|
|
typedef struct mutex_t {
|
|
/* fields are managed by mutex functions, don't touch */
|
|
/**
|
|
* @brief The value of the mutex; 0 if unlocked, 1 if locked. **Must
|
|
* never be changed by the user.**
|
|
* @internal
|
|
*/
|
|
unsigned int val;
|
|
/**
|
|
* @brief The process waiting queue of the mutex. **Must never be changed
|
|
* by the user.**
|
|
* @internal
|
|
*/
|
|
queue_node_t queue;
|
|
} mutex_t;
|
|
|
|
/**
|
|
* @brief Static initializer for mutex_t.
|
|
* @details This initializer is preferrable to mutex_init().
|
|
*/
|
|
#define MUTEX_INIT { 0, QUEUE_NODE_INIT }
|
|
|
|
/**
|
|
* @brief Initializes a mutex object.
|
|
* @details For intialization of variables use MUTEX_INIT instead.
|
|
* Only use the function call for dynamically allocated mutexes.
|
|
* @param[out] mutex pre-allocated mutex structure, must not be NULL.
|
|
*/
|
|
static inline void mutex_init(mutex_t *mutex)
|
|
{
|
|
mutex_t empty_mutex = MUTEX_INIT;
|
|
*mutex = empty_mutex;
|
|
}
|
|
|
|
/**
|
|
* @brief Tries to get a mutex, non-blocking.
|
|
*
|
|
* @param[in] mutex Mutex object to lock. Has to be initialized first. Must not
|
|
* be NULL.
|
|
*
|
|
* @return 1 if mutex was unlocked, now it is locked.
|
|
* @return 0 if the mutex was locked.
|
|
*/
|
|
int mutex_trylock(mutex_t *mutex);
|
|
|
|
/**
|
|
* @brief Locks a mutex, blocking.
|
|
*
|
|
* @param[in] mutex Mutex object to lock. Has to be initialized first. Must not be NULL.
|
|
*/
|
|
void mutex_lock(mutex_t *mutex);
|
|
|
|
/**
|
|
* @brief Unlocks the mutex.
|
|
*
|
|
* @param[in] mutex Mutex object to unlock, must not be NULL.
|
|
*/
|
|
void mutex_unlock(mutex_t *mutex);
|
|
|
|
/**
|
|
* @brief Unlocks the mutex and sends the current thread to sleep
|
|
*
|
|
* @param[in] mutex Mutex object to unlock, must not be NULL.
|
|
*/
|
|
void mutex_unlock_and_sleep(mutex_t *mutex);
|
|
|
|
#endif /* __MUTEX_H_ */
|
|
/** @} */
|