161 lines
5.4 KiB
C
161 lines
5.4 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio.
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This file is part of ChibiOS.
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ChibiOS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file chsem.h
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* @brief Semaphores macros and structures.
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*
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* @addtogroup semaphores
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* @{
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*/
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#ifndef _CHSEM_H_
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#define _CHSEM_H_
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#if (CH_CFG_USE_SEMAPHORES == TRUE) || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Module constants. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module pre-compile time settings. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module data structures and types. */
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/*===========================================================================*/
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/**
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* @brief Semaphore structure.
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*/
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typedef struct ch_semaphore {
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threads_queue_t s_queue; /**< @brief Queue of the threads sleeping
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on this semaphore. */
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cnt_t s_cnt; /**< @brief The semaphore counter. */
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} semaphore_t;
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/*===========================================================================*/
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/* Module macros. */
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/*===========================================================================*/
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/**
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* @brief Data part of a static semaphore initializer.
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* @details This macro should be used when statically initializing a semaphore
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* that is part of a bigger structure.
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*
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* @param[in] name the name of the semaphore variable
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* @param[in] n the counter initial value, this value must be
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* non-negative
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*/
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#define _SEMAPHORE_DATA(name, n) {_THREADS_QUEUE_DATA(name.s_queue), n}
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/**
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* @brief Static semaphore initializer.
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* @details Statically initialized semaphores require no explicit
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* initialization using @p chSemInit().
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*
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* @param[in] name the name of the semaphore variable
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* @param[in] n the counter initial value, this value must be
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* non-negative
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*/
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#define SEMAPHORE_DECL(name, n) semaphore_t name = _SEMAPHORE_DATA(name, n)
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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void chSemObjectInit(semaphore_t *sp, cnt_t n);
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void chSemReset(semaphore_t *sp, cnt_t n);
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void chSemResetI(semaphore_t *sp, cnt_t n);
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msg_t chSemWait(semaphore_t *sp);
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msg_t chSemWaitS(semaphore_t *sp);
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msg_t chSemWaitTimeout(semaphore_t *sp, systime_t time);
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msg_t chSemWaitTimeoutS(semaphore_t *sp, systime_t time);
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void chSemSignal(semaphore_t *sp);
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void chSemSignalI(semaphore_t *sp);
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void chSemAddCounterI(semaphore_t *sp, cnt_t n);
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msg_t chSemSignalWait(semaphore_t *sps, semaphore_t *spw);
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#ifdef __cplusplus
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}
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#endif
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/*===========================================================================*/
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/* Module inline functions. */
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/*===========================================================================*/
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/**
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* @brief Decreases the semaphore counter.
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* @details This macro can be used when the counter is known to be positive.
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*
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* @param[in] sp pointer to a @p semaphore_t structure
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*
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* @iclass
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*/
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static inline void chSemFastWaitI(semaphore_t *sp) {
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chDbgCheckClassI();
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sp->s_cnt--;
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}
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/**
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* @brief Increases the semaphore counter.
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* @details This macro can be used when the counter is known to be not
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* negative.
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*
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* @param[in] sp pointer to a @p semaphore_t structure
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*
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* @iclass
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*/
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static inline void chSemFastSignalI(semaphore_t *sp) {
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chDbgCheckClassI();
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sp->s_cnt++;
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}
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/**
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* @brief Returns the semaphore counter current value.
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*
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* @param[in] sp pointer to a @p semaphore_t structure
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* @return The semaphore counter value.
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*
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* @iclass
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*/
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static inline cnt_t chSemGetCounterI(semaphore_t *sp) {
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chDbgCheckClassI();
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return sp->s_cnt;
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}
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#endif /* CH_CFG_USE_SEMAPHORES == TRUE */
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#endif /* _CHSEM_H_ */
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/** @} */
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