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/* mbed Microcontroller Library
* Copyright (c) 2006-2012 ARM Limited
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef MUTEX_H
#define MUTEX_H
#include <stdint.h>
#include "cmsis_os.h"
namespace rtos {
/** The Mutex class is used to synchronise the execution of threads.
This is for example used to protect access to a shared resource.
*/
class Mutex {
public:
/** Create and Initialize a Mutex object */
Mutex();
/** Wait until a Mutex becomes available.
@param millisec timeout value or 0 in case of no time-out. (default: osWaitForever)
@return status code that indicates the execution status of the function.
*/
osStatus lock(uint32_t millisec=osWaitForever);
/** Try to lock the mutex, and return immediately
@return true if the mutex was acquired, false otherwise.
*/
bool trylock();
/** Unlock the mutex that has previously been locked by the same thread
@return status code that indicates the execution status of the function.
*/
osStatus unlock();
~Mutex();
private:
osMutexId _osMutexId;
osMutexDef_t _osMutexDef;
#ifdef CMSIS_OS_RTX
int32_t _mutex_data[3];
#endif
};
}
#endif
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