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/*
ChibiOS/RT - Copyright (C) 2006-2007 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/>.
*/
/**
* @addtogroup Semaphores
* @{
*/
#ifndef _SEMAPHORES_H_
#define _SEMAPHORES_H_
#ifdef CH_USE_SEMAPHORES
/**
* Semaphore structure.
*/
typedef struct Semaphore {
/** Queue of the threads sleeping on this Semaphore.*/
ThreadsQueue s_queue;
/** The Semaphore counter.*/
cnt_t s_cnt;
} Semaphore;
#ifdef __cplusplus
extern "C" {
#endif
void chSemInit(Semaphore *sp, cnt_t n);
void chSemReset(Semaphore *sp, cnt_t n);
void chSemResetI(Semaphore *sp, cnt_t n);
msg_t chSemWait(Semaphore *sp);
msg_t chSemWaitS(Semaphore *sp);
#ifdef CH_USE_SEMAPHORES_TIMEOUT
msg_t chSemWaitTimeout(Semaphore *sp, systime_t time);
msg_t chSemWaitTimeoutS(Semaphore *sp, systime_t time);
#endif
void chSemSignal(Semaphore *sp);
void chSemSignalI(Semaphore *sp);
#ifdef CH_USE_SEMSW
msg_t chSemSignalWait(Semaphore *sps, Semaphore *spw);
#endif
#ifdef __cplusplus
}
#endif
/**
* Decreases the semaphore counter, this macro can be used when it is ensured
* that the counter would not become negative.
*/
#define chSemFastWaitS(sp) ((sp)->s_cnt--)
/**
* Increases the semaphore counter, this macro can be used when the counter is
* not negative.
*/
#define chSemFastSignalI(sp) ((sp)->s_cnt++)
/**
* Returns the semaphore counter current value.
*/
#define chSemGetCounter(sp) ((sp)->s_cnt)
#endif /* CH_USE_SEMAPHORES */
#endif /* _SEMAPHORES_H_ */
/** @} */
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