Added a convenience class 'Mutex'

svn-id: r16566

common/mutex.cpp

@@ -0,0 +1,76 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2003-2005 The ScummVM project
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ *
+ */
+
+#include "stdafx.h"
+#include "common/mutex.h"
+#include "common/system.h"
+
+namespace Common {
+
+Mutex::Mutex() {
+	_mutex = g_system->createMutex();
+}
+
+Mutex::~Mutex() {
+	g_system->deleteMutex(_mutex);
+}
+
+void Mutex::lock() {
+	g_system->lockMutex(_mutex);
+}
+
+void Mutex::unlock() {
+	g_system->unlockMutex(_mutex);
+}
+
+
+#pragma mark -
+
+
+StackLock::StackLock(OSystem::MutexRef mutex, const char *mutexName)
+	: _mutex(mutex), _mutexName(mutexName) {
+	lock();
+}
+
+StackLock::StackLock(const Mutex &mutex, const char *mutexName)
+	: _mutex(mutex._mutex), _mutexName(mutexName) {
+	lock();
+}
+
+StackLock::~StackLock() {
+	unlock();
+}
+
+void StackLock::lock() {
+	if (_mutexName != NULL)
+		debug(6, "Locking mutex %s", _mutexName);
+	
+	g_system->lockMutex(_mutex);
+}
+
+void StackLock::unlock() {
+	if (_mutexName != NULL)
+		debug(6, "Unlocking mutex %s", _mutexName);
+
+	g_system->unlockMutex(_mutex);
+}
+
+}	// End of namespace Common