git-svn-id: svn://db.shs.com.ru/pip@4 12ceb7fc-bf1f-11e4-8940-5bc7170c53b5

src/thread/pimutex.h

@@ -0,0 +1,93 @@
+/*! \file pimutex.h
+ * \brief Mutex
+*/
+/*
+    PIP - Platform Independent Primitives
+    Mutex
+    Copyright (C) 2014  Ivan Pelipenko peri4ko@gmail.com
+
+    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
+	PIMutex();
+	
+	~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() {
+#ifdef WINDOWS
+		WaitForSingleObject(mutex, INFINITE);
+#else
+		pthread_mutex_lock(&mutex);
+#endif
+	}
+	
+	
+	//! \brief Unlock mutex
+	//! \details In any case this function returns immediate
+	void unlock() {
+#ifdef WINDOWS
+		ReleaseMutex(mutex);
+#else
+		pthread_mutex_unlock(&mutex);
+#endif
+	}
+	
+	
+	//! \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() {
+#ifdef WINDOWS
+		return (WaitForSingleObject(mutex, 0) == WAIT_OBJECT_0);
+#else
+		return (pthread_mutex_trylock(&mutex) == 0);
+#endif
+	}
+	
+private:
+#ifdef WINDOWS
+	void *
+#else
+	pthread_mutex_t
+#endif
+		mutex;
+	
+};
+
+
+class PIP_EXPORT PIMutexLocker
+{
+public:
+	PIMutexLocker(PIMutex * m): mutex(m) {mutex->lock();}
+	PIMutexLocker(PIMutex & m): mutex(&m) {mutex->lock();}
+	~PIMutexLocker() {mutex->unlock();}
+private:
+	PIMutex * mutex;
+};
+
+#endif // PIMUTEX_H