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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file chmtx.h
* @brief Mutexes macros and structures.
*
* @addtogroup mutexes
* @{
*/
#ifndef _CHMTX_H_
#define _CHMTX_H_
#if CH_USE_MUTEXES || defined(__DOXYGEN__)
/**
* @brief Mutex structure.
*/
typedef struct Mutex {
ThreadsQueue m_queue; /**< @brief Queue of the threads sleeping
on this Mutex. */
Thread *m_owner; /**< @brief Owner @p Thread pointer or
@p NULL. */
struct Mutex *m_next; /**< @brief Next @p Mutex into an
owner-list or @p NULL. */
} Mutex;
#ifdef __cplusplus
extern "C" {
#endif
void chMtxInit(Mutex *mp);
void chMtxLock(Mutex *mp);
void chMtxLockS(Mutex *mp);
bool_t chMtxTryLock(Mutex *mp);
bool_t chMtxTryLockS(Mutex *mp);
Mutex *chMtxUnlock(void);
Mutex *chMtxUnlockS(void);
void chMtxUnlockAll(void);
#ifdef __cplusplus
}
#endif
/**
* @brief Data part of a static mutex initializer.
* @details This macro should be used when statically initializing a mutex
* that is part of a bigger structure.
*
* @param[in] name the name of the mutex variable
*/
#define _MUTEX_DATA(name) {_THREADSQUEUE_DATA(name.m_queue), NULL, NULL}
/**
* @brief Static mutex initializer.
* @details Statically initialized mutexes require no explicit initialization
* using @p chMtxInit().
*
* @param[in] name the name of the mutex variable
*/
#define MUTEX_DECL(name) Mutex name = _MUTEX_DATA(name)
/**
* @name Macro Functions
* @{
*/
/**
* @brief Returns @p TRUE if the mutex queue contains at least a waiting
* thread.
*
* @sclass
*/
#define chMtxQueueNotEmptyS(mp) notempty(&(mp)->m_queue)
/** @} */
#endif /* CH_USE_MUTEXES */
#endif /* _CHMTX_H_ */
/** @} */
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