Permalink
Cannot retrieve contributors at this time
| /** | |
| * \file | |
| * \brief OnceFlag class header | |
| * | |
| * \author Copyright (C) 2015-2017 Kamil Szczygiel https://distortec.com https://freddiechopin.info | |
| * | |
| * \par License | |
| * This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not | |
| * distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/. | |
| */ | |
| #ifndef INCLUDE_DISTORTOS_ONCEFLAG_HPP_ | |
| #define INCLUDE_DISTORTOS_ONCEFLAG_HPP_ | |
| #include "distortos/Mutex.hpp" | |
| namespace distortos | |
| { | |
| /** | |
| * \brief OnceFlag is a helper class for callOnce(). | |
| * | |
| * Similar to std::once_flag - https://en.cppreference.com/w/cpp/thread/once_flag | |
| * Similar to POSIX pthread_once_t - https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_once.html# | |
| * | |
| * \ingroup synchronization | |
| */ | |
| class OnceFlag | |
| { | |
| template<typename Function, typename... Args> | |
| friend void callOnce(OnceFlag& onceFlag, Function&& function, Args&&... args); | |
| public: | |
| /** | |
| * \brief OnceFlag's constructor | |
| */ | |
| constexpr OnceFlag() : | |
| mutex_{}, | |
| done_{} | |
| { | |
| } | |
| private: | |
| /// internal mutex used by callOnce() | |
| Mutex mutex_; | |
| /// tells whether any function was already called for this object (true) or not (false) | |
| volatile bool done_; | |
| }; | |
| } // namespace distortos | |
| #endif // INCLUDE_DISTORTOS_ONCEFLAG_HPP_ |