81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
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/******************************************************************************
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The MIT License(MIT)
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Embedded Template Library.
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https://github.com/ETLCPP/etl
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https://www.etlcpp.com
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Copyright(c) 2020 Phil Wise phil@phil-wise.com
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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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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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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 ETL_MUTEX_FREERTOS_INCLUDED
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#define ETL_MUTEX_FREERTOS_INCLUDED
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#include "../platform.h"
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#include "FreeRTOS.h"
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#include <semphr.h>
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namespace etl
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{
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//***************************************************************************
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///\ingroup mutex
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///\brief This mutex class is implemented using FreeRTOS's mutexes
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//***************************************************************************
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class mutex
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{
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public:
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mutex()
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{
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access = xSemaphoreCreateMutexStatic(&mutex_allocation);
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}
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void lock()
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{
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xSemaphoreTake(access, portMAX_DELAY); // portMAX_DELAY=block forever
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}
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bool try_lock()
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{
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return xSemaphoreTake(access, 0) == pdTRUE;
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}
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void unlock()
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{
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xSemaphoreGive(access);
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}
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private:
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// Non-copyable
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mutex(const mutex&) ETL_DELETE;
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mutex& operator=(const mutex&) ETL_DELETE;
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// Memory to hold the mutex
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StaticSemaphore_t mutex_allocation;
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// The mutex handle itself
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SemaphoreHandle_t access;
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};
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}
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#endif
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