Mutex.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2012 ARM Limited
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00020  * SOFTWARE.
00021  */
00022 #include "rtos/Mutex.h"
00023 
00024 #include <string.h>
00025 #include "platform/mbed_error.h"
00026 
00027 namespace rtos {
00028 
00029 Mutex::Mutex() {
00030 #ifdef CMSIS_OS_RTX
00031     memset(_mutex_data, 0, sizeof(_mutex_data));
00032     _osMutexDef.mutex = _mutex_data;
00033 #endif
00034     _osMutexId = osMutexCreate(&_osMutexDef);
00035     if (_osMutexId == NULL) {
00036         error("Error initializing the mutex object\n");
00037     }
00038 }
00039 
00040 osStatus Mutex::lock(uint32_t millisec) {
00041     return osMutexWait(_osMutexId, millisec);
00042 }
00043 
00044 bool Mutex::trylock() {
00045     return (osMutexWait(_osMutexId, 0) == osOK);
00046 }
00047 
00048 osStatus Mutex::unlock() {
00049     return osMutexRelease(_osMutexId);
00050 }
00051 
00052 Mutex::~Mutex() {
00053     osMutexDelete(_osMutexId);
00054 }
00055 
00056 }