mirror of https://github.com/ARMmbed/mbed-os.git
104 lines
3.7 KiB
C++
104 lines
3.7 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2012 ARM Limited
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef MUTEX_H
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#define MUTEX_H
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#include <stdint.h>
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#include "cmsis_os2.h"
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#include "mbed_rtos1_types.h"
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#include "mbed_rtos_storage.h"
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#include "platform/NonCopyable.h"
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namespace rtos {
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/** \addtogroup rtos */
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/** @{*/
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/**
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* \defgroup rtos_Mutex Mutex class
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* @{
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*/
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/** The Mutex class is used to synchronize the execution of threads.
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This is for example used to protect access to a shared resource.
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@note
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Memory considerations: The mutex control structures will be created on current thread's stack, both for the mbed OS
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and underlying RTOS objects (static or dynamic RTOS memory pools are not being used).
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*/
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class Mutex : private mbed::NonCopyable<Mutex> {
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public:
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/** Create and Initialize a Mutex object */
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Mutex();
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/** Create and Initialize a Mutex object
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@param name name to be used for this mutex. It has to stay allocated for the lifetime of the thread.
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*/
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Mutex(const char *name);
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/** Wait until a Mutex becomes available.
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@param millisec timeout value or 0 in case of no time-out. (default: osWaitForever)
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@return status code that indicates the execution status of the function:
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@a osOK the mutex has been obtained.
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@a osErrorTimeout the mutex could not be obtained in the given time.
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@a osErrorParameter internal error.
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@a osErrorResource the mutex could not be obtained when no timeout was specified.
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@a osErrorISR this function cannot be called from the interrupt service routine.
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*/
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osStatus lock(uint32_t millisec=osWaitForever);
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/** Try to lock the mutex, and return immediately
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@return true if the mutex was acquired, false otherwise.
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*/
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bool trylock();
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/** Unlock the mutex that has previously been locked by the same thread
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@return status code that indicates the execution status of the function:
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@a osOK the mutex has been released.
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@a osErrorParameter internal error.
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@a osErrorResource the mutex was not locked or the current thread wasn't the owner.
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@a osErrorISR this function cannot be called from the interrupt service routine.
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*/
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osStatus unlock();
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/** Get the owner the this mutex
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@return the current owner of this mutex.
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*/
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osThreadId get_owner();
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~Mutex();
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private:
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void constructor(const char *name = NULL);
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friend class ConditionVariable;
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osMutexId_t _id;
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mbed_rtos_storage_mutex_t _obj_mem;
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uint32_t _count;
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};
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/** @}*/
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/** @}*/
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}
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#endif
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