105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT 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/RT 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_USE_SEMAPHORES
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/**
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* @brief Semaphore structure.
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*/
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typedef struct Semaphore {
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ThreadsQueue 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;
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#ifdef __cplusplus
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extern "C" {
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#endif
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void chSemInit(Semaphore *sp, cnt_t n);
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void chSemReset(Semaphore *sp, cnt_t n);
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void chSemResetI(Semaphore *sp, cnt_t n);
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msg_t chSemWait(Semaphore *sp);
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msg_t chSemWaitS(Semaphore *sp);
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msg_t chSemWaitTimeout(Semaphore *sp, systime_t time);
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msg_t chSemWaitTimeoutS(Semaphore *sp, systime_t time);
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void chSemSignal(Semaphore *sp);
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void chSemSignalI(Semaphore *sp);
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#if CH_USE_SEMSW
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msg_t chSemSignalWait(Semaphore *sps, Semaphore *spw);
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#endif
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#ifdef __cplusplus
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}
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#endif
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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) {_THREADSQUEUE_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 name = _SEMAPHORE_DATA(name, n)
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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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#define chSemFastWaitI(sp) ((sp)->s_cnt--)
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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 negative.
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*/
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#define chSemFastSignalI(sp) ((sp)->s_cnt++)
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/**
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* @brief Returns the semaphore counter current value.
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*/
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#define chSemGetCounterI(sp) ((sp)->s_cnt)
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#endif /* CH_USE_SEMAPHORES */
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#endif /* _CHSEM_H_ */
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/** @} */
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