You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
169 lines
5.6 KiB
C
169 lines
5.6 KiB
C
/*
|
|
ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio.
|
|
|
|
This file is part of ChibiOS.
|
|
|
|
ChibiOS 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 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 rt/include/chmtx.h
|
|
* @brief Mutexes macros and structures.
|
|
*
|
|
* @addtogroup mutexes
|
|
* @{
|
|
*/
|
|
|
|
#ifndef CHMTX_H
|
|
#define CHMTX_H
|
|
|
|
#if (CH_CFG_USE_MUTEXES == TRUE) || defined(__DOXYGEN__)
|
|
|
|
/*===========================================================================*/
|
|
/* Module constants. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module pre-compile time settings. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Derived constants and error checks. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module data structures and types. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Type of a mutex structure.
|
|
*/
|
|
typedef struct ch_mutex mutex_t;
|
|
|
|
/**
|
|
* @brief Mutex structure.
|
|
*/
|
|
struct ch_mutex {
|
|
threads_queue_t queue; /**< @brief Queue of the threads sleeping
|
|
on this mutex. */
|
|
thread_t *owner; /**< @brief Owner @p thread_t pointer or
|
|
@p NULL. */
|
|
mutex_t *next; /**< @brief Next @p mutex_t into an
|
|
owner-list or @p NULL. */
|
|
#if (CH_CFG_USE_MUTEXES_RECURSIVE == TRUE) || defined(__DOXYGEN__)
|
|
cnt_t cnt; /**< @brief Mutex recursion counter. */
|
|
#endif
|
|
};
|
|
|
|
/*===========================================================================*/
|
|
/* Module macros. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @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
|
|
*/
|
|
#if (CH_CFG_USE_MUTEXES_RECURSIVE == TRUE) || defined(__DOXYGEN__)
|
|
#define _MUTEX_DATA(name) {_THREADS_QUEUE_DATA(name.queue), NULL, NULL, 0}
|
|
#else
|
|
#define _MUTEX_DATA(name) {_THREADS_QUEUE_DATA(name.queue), NULL, NULL}
|
|
#endif
|
|
|
|
/**
|
|
* @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_t name = _MUTEX_DATA(name)
|
|
|
|
/*===========================================================================*/
|
|
/* External declarations. */
|
|
/*===========================================================================*/
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
void chMtxObjectInit(mutex_t *mp);
|
|
void chMtxLock(mutex_t *mp);
|
|
void chMtxLockS(mutex_t *mp);
|
|
bool chMtxTryLock(mutex_t *mp);
|
|
bool chMtxTryLockS(mutex_t *mp);
|
|
void chMtxUnlock(mutex_t *mp);
|
|
void chMtxUnlockS(mutex_t *mp);
|
|
void chMtxUnlockAll(void);
|
|
void chMtxUnlockAllS(void);
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
/*===========================================================================*/
|
|
/* Module inline functions. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Returns @p true if the mutex queue contains at least a waiting
|
|
* thread.
|
|
*
|
|
* @param[out] mp pointer to a @p mutex_t structure
|
|
* @return The mutex queue status.
|
|
*
|
|
* @sclass
|
|
*/
|
|
static inline bool chMtxQueueNotEmptyS(mutex_t *mp) {
|
|
|
|
chDbgCheckClassS();
|
|
|
|
return queue_notempty(&mp->queue);
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the mutex owner thread.
|
|
*
|
|
* @param[out] mp pointer to a @p mutex_t structure
|
|
* @return The owner thread.
|
|
* @retval NULL if the mutex is not owned.
|
|
*
|
|
* @iclass
|
|
*/
|
|
static inline thread_t *chMtxGetOwnerI(mutex_t *mp) {
|
|
|
|
chDbgCheckClassI();
|
|
|
|
return mp->owner;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the next mutex in the mutexes stack of the current thread.
|
|
*
|
|
* @return A pointer to the next mutex in the stack.
|
|
* @retval NULL if the stack is empty.
|
|
*
|
|
* @xclass
|
|
*/
|
|
static inline mutex_t *chMtxGetNextMutexX(void) {
|
|
|
|
return chThdGetSelfX()->mtxlist;
|
|
}
|
|
|
|
#endif /* CH_CFG_USE_MUTEXES == TRUE */
|
|
|
|
#endif /* CHMTX_H */
|
|
|
|
/** @} */
|