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 "Mutex.h"
00023 #include <string.h>
00024 #include "error.h"
00025 
00026 namespace rtos {
00027 
00028 Mutex::Mutex() {
00029 #ifdef CMSIS_OS_RTX
00030     memset(_mutex_data, 0, sizeof(_mutex_data));
00031     _osMutexDef.mutex = _mutex_data;
00032 #endif
00033     _osMutexId = osMutexCreate(&_osMutexDef);
00034     if (_osMutexId == NULL) {
00035         error("Error initializing the mutex object\n");
00036     }
00037 }
00038 
00039 osStatus Mutex::lock(uint32_t millisec) {
00040     return osMutexWait(_osMutexId, millisec);
00041 }
00042 
00043 bool Mutex::trylock() {
00044     return (osMutexWait(_osMutexId, 0) == osOK);
00045 }
00046 
00047 osStatus Mutex::unlock() {
00048     return osMutexRelease(_osMutexId);
00049 }
00050 
00051 Mutex::~Mutex() {
00052     osMutexDelete(_osMutexId);
00053 }
00054 
00055 }