diff options
Diffstat (limited to 'src/chsem.c')
| -rw-r--r-- | src/chsem.c | 257 |
1 files changed, 0 insertions, 257 deletions
diff --git a/src/chsem.c b/src/chsem.c deleted file mode 100644 index 9a8570580..000000000 --- a/src/chsem.c +++ /dev/null @@ -1,257 +0,0 @@ -/*
- 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/>.
-*/
-
-/**
- * @file chsem.c
- * @brief Semaphores code.
- * @addtogroup Semaphores
- * @{
- */
-
-#include <ch.h>
-
-#if CH_USE_SEMAPHORES
-
-#if CH_USE_SEMAPHORES_PRIORITY
-#define sem_insert(tp, qp) prio_insert(tp, qp)
-#else
-#define sem_insert(tp, qp) queue_insert(tp, qp)
-#endif
-
-/**
- * @brief Initializes a semaphore with the specified counter value.
- *
- * @param[out] sp pointer to a @p Semaphore structure
- * @param[in] n initial value of the semaphore counter. Must be non-negative.
- * @note This function can be invoked from within an interrupt handler even if
- * it is not an I-Class API because it does not touch any critical kernel
- * data structure.
- */
-void chSemInit(Semaphore *sp, cnt_t n) {
-
- chDbgCheck((sp != NULL) && (n >= 0), "chSemInit");
-
- queue_init(&sp->s_queue);
- sp->s_cnt = n;
-}
-
-/**
- * @brief Performs a reset operation on the semaphore.
- *
- * @param[in] sp pointer to a @p Semaphore structure
- * @param[in] n the new value of the semaphore counter. The value must be non-negative.
- * @note The released threads can recognize they were waked up by a reset
- * instead than a signal because the @p chSemWait() will return
- * @p RDY_RESET instead of @p RDY_OK.
- */
-void chSemReset(Semaphore *sp, cnt_t n) {
-
- chSysLock();
- chSemResetI(sp, n);
- chSchRescheduleS();
- chSysUnlock();
-}
-
-/**
- * @brief Performs a reset operation on the semaphore.
- *
- * @param[in] sp pointer to a @p Semaphore structure
- * @param[in] n the new value of the semaphore counter. The value must be non-negative.
- * @note The released threads can recognize they were waked up by a reset
- * instead than a signal because the @p chSemWait() will return
- * @p RDY_RESET instead of @p RDY_OK.
- * @note This function does not reschedule.
- */
-void chSemResetI(Semaphore *sp, cnt_t n) {
- cnt_t cnt;
-
- chDbgCheck((sp != NULL) && (n >= 0), "chSemResetI");
-
- cnt = sp->s_cnt;
- sp->s_cnt = n;
- while (cnt++ < 0)
- chSchReadyI(lifo_remove(&sp->s_queue))->p_rdymsg = RDY_RESET;
-}
-
-/**
- * @brief Performs a wait operation on a semaphore.
- *
- * @param[in] sp pointer to a @p Semaphore structure
- * @retval RDY_OK if the semaphore was signaled or not taken.
- * @retval RDY_RESET if the semaphore was reset using @p chSemReset().
- */
-msg_t chSemWait(Semaphore *sp) {
- msg_t msg;
-
- chSysLock();
- msg = chSemWaitS(sp);
- chSysUnlock();
- return msg;
-}
-
-/**
- * @brief Performs a wait operation on a semaphore.
- *
- * @param[in] sp pointer to a @p Semaphore structure
- * @retval RDY_OK if the semaphore was signaled or not taken.
- * @retval RDY_RESET if the semaphore was reset using @p chSemReset().
- * @note This function must be called with interrupts disabled.
- * @note This function cannot be called by an interrupt handler.
- */
-msg_t chSemWaitS(Semaphore *sp) {
-
- chDbgCheck(sp != NULL, "chSemWaitS");
-
- if (--sp->s_cnt < 0) {
- sem_insert(currp, &sp->s_queue);
- currp->p_wtsemp = sp;
- chSchGoSleepS(PRWTSEM);
- return currp->p_rdymsg;
- }
- return RDY_OK;
-}
-
-/**
- * @brief Performs a wait operation on a semaphore with timeout specification.
- *
- * @param[in] sp pointer to a @p Semaphore structure
- * @param[in] time the number of ticks before the operation timeouts,
- * the following special values are allowed:
- * - @a TIME_IMMEDIATE immediate timeout.
- * - @a TIME_INFINITE no timeout.
- * .
- * @retval RDY_OK if the semaphore was signaled or not taken.
- * @retval RDY_RESET if the semaphore was reset using @p chSemReset().
- * @retval RDY_TIMEOUT if the semaphore was not signaled or reset within the
- * specified timeout.
- */
-msg_t chSemWaitTimeout(Semaphore *sp, systime_t time) {
- msg_t msg;
-
- chSysLock();
- msg = chSemWaitTimeoutS(sp, time);
- chSysUnlock();
- return msg;
-}
-
-/**
- * @brief Performs a wait operation on a semaphore with timeout specification.
- *
- * @param[in] sp pointer to a @p Semaphore structure
- * @param[in] time the number of ticks before the operation timeouts,
- * the following special values are allowed:
- * - @a TIME_IMMEDIATE immediate timeout.
- * - @a TIME_INFINITE no timeout.
- * .
- * @retval RDY_OK if the semaphore was signaled or not taken.
- * @retval RDY_RESET if the semaphore was reset using @p chSemReset().
- * @retval RDY_TIMEOUT if the semaphore was not signaled or reset within the specified
- * timeout.
- */
-msg_t chSemWaitTimeoutS(Semaphore *sp, systime_t time) {
-
- chDbgCheck(sp != NULL, "chSemWaitTimeoutS");
-
- if (--sp->s_cnt < 0) {
- if (TIME_IMMEDIATE == time) {
- sp->s_cnt++;
- return RDY_TIMEOUT;
- }
- sem_insert(currp, &sp->s_queue);
- currp->p_wtsemp = sp;
- return chSchGoSleepTimeoutS(PRWTSEM, time);
- }
- return RDY_OK;
-}
-
-/**
- * @brief Performs a signal operation on a semaphore.
- *
- * @param[in] sp pointer to a @p Semaphore structure
- * @note The function is available only if the @p CH_USE_SEMAPHORES
- * option is enabled in @p chconf.h.
- */
-void chSemSignal(Semaphore *sp) {
-
- chDbgCheck(sp != NULL, "chSemSignal");
-
- chSysLock();
- if (sp->s_cnt++ < 0)
- chSchWakeupS(fifo_remove(&sp->s_queue), RDY_OK);
- chSysUnlock();
-}
-
-/**
- * @brief Performs a signal operation on a semaphore.
- *
- * @param[in] sp pointer to a @p Semaphore structure
- * @note The function is available only if the @p CH_USE_SEMAPHORES
- * option is enabled in @p chconf.h.
- * @note This function does not reschedule.
- */
-void chSemSignalI(Semaphore *sp) {
-
- chDbgCheck(sp != NULL, "chSemSignalI");
-
- if (sp->s_cnt++ < 0) {
- /* NOTE: It is done this way in order to allow a tail call on
- chSchReadyI().*/
- Thread *tp = fifo_remove(&sp->s_queue);
- tp->p_rdymsg = RDY_OK;
- chSchReadyI(tp);
- }
-}
-
-#if CH_USE_SEMSW
-/**
- * @brief Performs atomic signal and wait operations on two semaphores.
- *
- * @param[in] sps pointer to a @p Semaphore structure to be signaled
- * @param[in] spw pointer to a @p Semaphore structure to be wait on
- * @retval RDY_OK if the semaphore was signaled or not taken.
- * @retval RDY_RESET if the semaphore was reset using @p chSemReset().
- * @note The function is available only if the @p CH_USE_SEMSW
- * option is enabled in @p chconf.h.
- */
-msg_t chSemSignalWait(Semaphore *sps, Semaphore *spw) {
- msg_t msg;
-
- chDbgCheck((sps != NULL) && (spw != NULL), "chSemSignalWait");
-
- chSysLock();
- if (sps->s_cnt++ < 0)
- chSchReadyI(fifo_remove(&sps->s_queue))->p_rdymsg = RDY_OK;
- if (--spw->s_cnt < 0) {
- sem_insert(currp, &spw->s_queue);
- currp->p_wtsemp = spw;
- chSchGoSleepS(PRWTSEM);
- msg = currp->p_rdymsg;
- }
- else {
- chSchRescheduleS();
- msg = RDY_OK;
- }
- chSysUnlock();
- return msg;
-}
-#endif /* CH_USE_SEMSW */
-
-#endif /* CH_USE_SEMAPHORES */
-
-/** @} */
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