git-svn-id: svn://db.shs.com.ru/pip@400 12ceb7fc-bf1f-11e4-8940-5bc7170c53b5

src_main/thread/pimutex.h

@@ -0,0 +1,78 @@
+/*! \file pimutex.h
+ * \brief Mutex
+*/
+/*
+    PIP - Platform Independent Primitives
+    Mutex
+    Copyright (C) 2016  Ivan Pelipenko peri4ko@yandex.ru
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef PIMUTEX_H
+#define PIMUTEX_H
+
+#include "piinit.h"
+
+class PIP_EXPORT PIMutex
+{
+public:
+	//! 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();
+	
+	//! Returns if mutex is locked
+	bool isLocked() const;
+	
+private:
+	explicit PIMutex(const PIMutex & );
+	void operator =(const PIMutex & );
+
+	void init();
+	void destroy();
+	PRIVATE_DECLARATION
+	bool inited_;
+	volatile bool locked;
+};
+
+
+class PIP_EXPORT PIMutexLocker
+{
+public:
+	PIMutexLocker(PIMutex * m, bool condition = true): mutex(m), cond(condition) {if (cond) mutex->lock();}
+	PIMutexLocker(PIMutex & m, bool condition = true): mutex(&m), cond(condition) {if (cond) mutex->lock();}
+	~PIMutexLocker() {if (cond) mutex->unlock();}
+private:
+	PIMutex * mutex;
+	volatile bool cond;
+};
+
+#endif // PIMUTEX_H