| 0,0 → 1,108 |
|---|
| /* |
| * Copyright (C) 2001-2004 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** @addtogroup sync |
| * @{ |
| */ |
| |
| /** |
| * @file |
| * @brief Condition variables. |
| */ |
| |
| #include <synch/condvar.h> |
| #include <synch/mutex.h> |
| #include <synch/waitq.h> |
| #include <synch/synch.h> |
| #include <arch.h> |
| #include <typedefs.h> |
| |
| /** Initialize condition variable. |
| * |
| * @param cv Condition variable. |
| */ |
| void condvar_initialize(condvar_t *cv) |
| { |
| waitq_initialize(&cv->wq); |
| } |
| |
| /** |
| * Signal the condition has become true |
| * to the first waiting thread by waking it up. |
| * |
| * @param cv Condition variable. |
| */ |
| void condvar_signal(condvar_t *cv) |
| { |
| waitq_wakeup(&cv->wq, WAKEUP_FIRST); |
| } |
| |
| /** |
| * Signal the condition has become true |
| * to all waiting threads by waking them up. |
| * |
| * @param cv Condition variable. |
| */ |
| void condvar_broadcast(condvar_t *cv) |
| { |
| waitq_wakeup(&cv->wq, WAKEUP_ALL); |
| } |
| |
| /** Wait for the condition becoming true. |
| * |
| * @param cv Condition variable. |
| * @param mtx Mutex. |
| * @param usec Timeout value in microseconds. |
| * @param flags Select mode of operation. |
| * |
| * For exact description of meaning of possible combinations |
| * of usec and flags, see comment for waitq_sleep_timeout(). |
| * Note that when SYNCH_FLAGS_NON_BLOCKING is specified here, |
| * ESYNCH_WOULD_BLOCK is always returned. |
| * |
| * @return See comment for waitq_sleep_timeout(). |
| */ |
| int _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, uint32_t usec, int flags) |
| { |
| int rc; |
| ipl_t ipl; |
| |
| ipl = waitq_sleep_prepare(&cv->wq); |
| mutex_unlock(mtx); |
| |
| cv->wq.missed_wakeups = 0; /* Enforce blocking. */ |
| rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, flags); |
| |
| mutex_lock(mtx); |
| waitq_sleep_finish(&cv->wq, rc, ipl); |
| |
| return rc; |
| } |
| |
| /** @} |
| */ |