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memory_semaphore.cpp
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/**
* @file memory_semaphore.cpp
* @author Atakan S.
* @date 01/01/2019
* @version 1.0
* @brief Semaphore class for Cortex-M3/M4.
*
* @copyright Copyright (c) 2018 Atakan SARIOGLU ~ www.atakansarioglu.com
*
* 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.
*/
// Includes.
#include "memory_semaphore.h"
// The namespace.
namespace memory_exclusive {
using namespace std;
bool Semaphore::GiveCounting(const uint32_t maxCount, function<bool ()> timeout) {
// Pass lambda function that checks if the value is less than the limit then increases it.
return MemoryEx::ReadModifyWrite_if(m_memory, [maxCount](uint32_t& val) {return (val++ < maxCount);}, timeout);
}
bool Semaphore::Give(function<bool ()> timeout) {
// Call counting semaphore giver with unity count.
return GiveCounting(1, timeout);
}
bool Semaphore::Take(function<bool ()> timeout){
// Pass lambda function that checks if the value is not zero then decreases it.
return MemoryEx::ReadModifyWrite_if(m_memory, [](uint32_t& val) {return (0 < val--);}, timeout);
}
}