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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/>.
*/
/*
Concepts and parts of this file are contributed by and Copyright (C) 2008
of Leon Woestenberg
*/
/**
* @addtogroup CondVars
* @{
*/
#include <ch.h>
#if defined(CH_USE_CONDVARS) && defined(CH_USE_MUTEXES)
/**
* Initializes s \p CondVar structure.
* @param cp pointer to a \p CondVar structure
*/
void chCondInit(CondVar *cp) {
queue_init(&cp->c_queue);
}
/**
* Signals one thread that is waiting on the condition variable.
*
* @param mp pointer to the \p CondVar structure
*/
void chCondSignal(CondVar *cp) {
chSysLock();
if (notempty(&cp->c_queue)) /* any thread ? */
chSchWakeupS(fifo_remove(&cp->c_queue), RDY_OK);
chSysUnlock();
}
/**
* Signals one thread that is waiting on the condition variable.
*
* @param cp pointer to the \p CondVar structure
* @note This function must be called within a \p chSysLock() / \p chSysUnlock()
* block.
*/
void chCondSignalI(CondVar *cp) {
if (notempty(&cp->c_queue)) /* any thread ? */
chSchReadyI(fifo_remove(&cp->c_queue))->p_rdymsg = RDY_OK;
}
/**
* Signal all threads that are waiting on the condition variable.
*
* @param mp pointer to the \p CondVar structure
*/
void chCondBroadcast(CondVar *cp) {
chSysLock();
chCondBroadcastI(cp);
chSchRescheduleS();
chSysUnlock();
}
/**
* Signal all threads that are waiting on the condition variable.
*
* @param cp pointer to the \p CondVar structure
* @note This function must be called within a \p chSysLock() / \p chSysUnlock()
*/
void chCondBroadcastI(CondVar *cp) {
/* empties the condition variable queue and inserts all the Threads into the
* ready list in FIFO order. The wakeup message is set to \p RDY_RESET in
* order to make a chCondBroadcast() detectable from a chCondSignal(). */
while (cp->c_queue.p_next != (void *)&cp->c_queue)
chSchReadyI(fifo_remove(&cp->c_queue))->p_rdymsg = RDY_RESET;
}
/**
* Wait on the condition variable releasing the mutex lock.
*
* Releases the mutex, waits on the condition variable, and finally acquires
* the mutex again. This is done atomically.
*
* The thread MUST already have locked the mutex when calling chCondWait().
*
* @param cp pointer to the \p CondVar structure
* @return The wakep mode.
* @retval RDY_OK if the condvar was signaled using chCondSignal().
* @retval RDY_RESET if the condvar was signaled using chCondBroadcast().
*/
msg_t chCondWait(CondVar *cp) {
msg_t msg;
chSysLock();
msg = chCondWaitS(cp);
chSysUnlock();
return msg;
}
/**
* Wait on the condition variable releasing the mutex lock.
*
* Releases the mutex, waits on the condition variable, and finally acquires
* the mutex again. This is done atomically.
*
* The thread MUST already have locked the mutex when calling chCondWait().
*
* @param cp pointer to the \p CondVar structure
* @return The wakep mode.
* @retval RDY_OK if the condvar was signaled using chCondSignal().
* @retval RDY_RESET if the condvar was signaled using chCondBroadcast().
* @note This function must be called within a \p chSysLock() / \p chSysUnlock()
*/
msg_t chCondWaitS(CondVar *cp) {
Mutex *mp;
msg_t msg;
chDbgAssert(currp->p_mtxlist != NULL, "chcond.c, chCondWaitS()");
mp = chMtxUnlockS(); /* unlocks the condvar mutex */
prio_insert(currp, &cp->c_queue); /* enters the condvar queue */
currp->p_wtcondp = cp; /* needed by the tracer */
chSchGoSleepS(PRWTCOND); /* waits on the condvar */
msg = currp->p_rdymsg; /* fetches the wakeup message */
chMtxLockS(mp); /* atomically relocks the mutex */
return msg; /* returns the wakeup message */
}
#ifdef CH_USE_CONDVARS_TIMEOUT
/**
* Wait on the condition variable releasing the mutex lock.
*
* Releases the mutex, waits on the condition variable, and finally acquires
* the mutex again. This is done atomically.
*
* The thread MUST already have locked the mutex when calling chCondWait().
*
* @param cp pointer to the \p CondVar structure
* @param time the number of ticks before the operation fails
* @return The wakep mode.
* @retval RDY_OK if the condvar was signaled using chCondSignal().
* @retval RDY_RESET if the condvar was signaled using chCondBroadcast().
* @retval RDY_TIMEOUT if the condvar was not signaled within the specified
* timeout.
*/
msg_t chCondWaitTimeout(CondVar *cp, systime_t time) {
msg_t msg;
chSysLock();
msg = chCondWaitTimeoutS(cp, time);
chSysUnlock();
return msg;
}
/**
* Wait on the condition variable releasing the mutex lock.
*
* Releases the mutex, waits on the condition variable, and finally acquires
* the mutex again. This is done atomically.
*
* The thread MUST already have locked the mutex when calling chCondWait().
*
* @param cp pointer to the \p CondVar structure
* @param time the number of ticks before the operation fails
* @return The wakep mode.
* @retval RDY_OK if the condvar was signaled using chCondSignal().
* @retval RDY_RESET if the condvar was signaled using chCondBroadcast().
* @retval RDY_TIMEOUT if the condvar was not signaled within the specified
* timeout.
* @note This function must be called within a \p chSysLock() / \p chSysUnlock()
*/
msg_t chCondWaitTimeoutS(CondVar *cp, systime_t time) {
Mutex *mp;
msg_t msg;
chDbgAssert(currp->p_mtxlist != NULL, "chcond.c, chCondWaitS()");
mp = chMtxUnlockS(); /* unlocks the condvar mutex */
prio_insert(currp, &cp->c_queue); /* enters the condvar queue */
currp->p_wtcondp = cp; /* needed by the tracer */
chSchGoSleepTimeoutS(PRWTCOND, time); /* waits on the condvar */
msg = currp->p_rdymsg; /* fetches the wakeup message */
chMtxLockS(mp); /* atomically relocks the mutex */
return msg; /* returns the wakeup message */
}
#endif /* CH_USE_CONDVARS_TIMEOUT */
#endif /* defined(CH_USE_CONDVARS) && defined(CH_USE_MUTEXES) */
/** @} */
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