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libs/main/thread/pimutex.h

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+/*! \file pimutex.h
+ * \brief PIMutexLocker
+*/
+/*
+	PIP - Platform Independent Primitives
+	PIMutexLocker
+	Ivan Pelipenko peri4ko@yandex.ru, Stephan Fomenko, Andrey Bychkov work.a.b@yandex.ru
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef PIMUTEX_H
+#define PIMUTEX_H
+
+#include "piinit.h"
+#include <mutex>
+
+
+class PIP_EXPORT PIMutex
+{
+public:
+	NO_COPY_CLASS(PIMutex)
+
+	//! Constructs unlocked mutex
+	explicit PIMutex();
+
+	//! Destroy mutex
+	~PIMutex();
+
+
+	//! \brief Lock mutex
+	//! \details If mutex is unlocked it set to locked state and returns immediate.
+	//! If mutex is already locked function blocks until mutex will be unlocked
+	void lock();
+
+	//! \brief Unlock mutex
+	//! \details In any case this function returns immediate
+	void unlock() ;
+
+	//! \brief Try to lock mutex
+	//! \details If mutex is unlocked it set to locked state and returns "true" immediate.
+	//! If mutex is already locked function returns immediate an returns "false"
+	bool tryLock();
+
+	void * handle();
+
+private:
+	void init();
+	void destroy();
+
+	PRIVATE_DECLARATION(PIP_EXPORT)
+
+};
+
+
+//! \brief PIMutexLocker
+//! \details Same as std::lock_guard<std::mutex>.
+//! When a PIMutexLocker object is created, it attempts to lock the mutex it is given, if "condition" true.
+//! When control leaves the scope in which the PIMutexLocker object was created,
+//! the PIMutexLocker is destructed and the mutex is released, if "condition" true.
+//! If "condition" false this class do nothing.
+//! The PIMutexLocker class is non-copyable.
+class PIP_EXPORT PIMutexLocker
+{
+public:
+	NO_COPY_CLASS(PIMutexLocker)
+	PIMutexLocker(PIMutex & m, bool condition = true): mutex(m), cond(condition) {if (cond) mutex.lock();}
+	~PIMutexLocker() {if (cond) mutex.unlock();}
+private:
+	PIMutex & mutex;
+	bool cond;
+};
+
+#endif // PIMUTEX_H