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40e1f02ffb
- Improve mutex handling. - Move verifyEncryptionRequestHmac function from JsonTranslator to EspnowEncryptionBroker. - Remove UtilityMethods.cpp.
97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
/*
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* Copyright (C) 2019 Anders Löfgren
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*
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* License (MIT license):
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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
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* THE SOFTWARE.
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*/
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#include "MutexTracker.h"
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namespace
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{
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std::shared_ptr<bool> _captureBan = std::make_shared<bool>(false);
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}
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MutexTracker::MutexTracker(const std::shared_ptr<bool> &mutexToCapture)
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{
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attemptMutexCapture(mutexToCapture);
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}
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MutexTracker::MutexTracker(const std::shared_ptr<bool> &mutexToCapture, const std::function<void()> destructorHook) : MutexTracker(mutexToCapture)
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{
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_destructorHook = destructorHook;
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}
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MutexTracker::~MutexTracker()
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{
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releaseMutex();
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_destructorHook();
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}
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MutexTracker MutexTracker::captureBan()
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{
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// Syntax like this will move the resulting value into its new position (similar to NRVO): https://stackoverflow.com/a/11540204
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return MutexTracker(_captureBan);
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}
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MutexTracker MutexTracker::captureBan(const std::function<void()> destructorHook) { return MutexTracker(_captureBan, destructorHook); }
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bool MutexTracker::mutexFree(const std::shared_ptr<bool> &mutex)
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{
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if(mutex != nullptr && !(*mutex))
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return true;
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return false;
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}
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bool MutexTracker::mutexCaptured(const std::shared_ptr<bool> &mutex)
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{
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if(mutex != nullptr && (*mutex))
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return true;
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return false;
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}
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bool MutexTracker::mutexCaptured() const
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{
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return mutexCaptured(_capturedMutex);
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}
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void MutexTracker::releaseMutex()
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{
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if(mutexCaptured())
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{
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*_capturedMutex = false;
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_capturedMutex.reset();
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}
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}
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bool MutexTracker::attemptMutexCapture(const std::shared_ptr<bool> &mutexToCapture)
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{
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if(mutexFree(_captureBan) && mutexFree(mutexToCapture))
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{
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_capturedMutex = mutexToCapture;
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*_capturedMutex = true;
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return true;
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}
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return false;
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}
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