| 0,0 → 1,96 |
|---|
| /* |
| * 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 Mutexes. |
| */ |
| |
| #include <synch/mutex.h> |
| #include <synch/semaphore.h> |
| #include <synch/synch.h> |
| #include <debug.h> |
| |
| /** Initialize mutex. |
| * |
| * @param mtx Mutex. |
| * @param type Type of the mutex. |
| */ |
| void mutex_initialize(mutex_t *mtx, mutex_type_t type) |
| { |
| mtx->type = type; |
| semaphore_initialize(&mtx->sem, 1); |
| } |
| |
| /** Acquire mutex. |
| * |
| * Timeout mode and non-blocking mode can be requested. |
| * |
| * @param mtx Mutex. |
| * @param usec Timeout in microseconds. |
| * @param flags Specify mode of operation. |
| * |
| * For exact description of possible combinations of |
| * usec and flags, see comment for waitq_sleep_timeout(). |
| * |
| * @return See comment for waitq_sleep_timeout(). |
| */ |
| int _mutex_lock_timeout(mutex_t *mtx, uint32_t usec, int flags) |
| { |
| int rc; |
| |
| if (mtx->type == MUTEX_PASSIVE) { |
| rc = _semaphore_down_timeout(&mtx->sem, usec, flags); |
| } else { |
| ASSERT(mtx->type == MUTEX_ACTIVE); |
| ASSERT(usec == SYNCH_NO_TIMEOUT); |
| ASSERT(!(flags & SYNCH_FLAGS_INTERRUPTIBLE)); |
| do { |
| rc = semaphore_trydown(&mtx->sem); |
| } while (SYNCH_FAILED(rc) && |
| !(flags & SYNCH_FLAGS_NON_BLOCKING)); |
| } |
| |
| return rc; |
| } |
| |
| /** Release mutex. |
| * |
| * @param mtx Mutex. |
| */ |
| void mutex_unlock(mutex_t *mtx) |
| { |
| semaphore_up(&mtx->sem); |
| } |
| |
| /** @} |
| */ |