Imported MaNGOS revision 6767 from http://mangos.svn.sourceforge.net/svnroot/mangos/trunk/

dep/src/zthread/macos/FastLock.h

@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2005, Eric Crahen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is furnished
+ * to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __ZTFASTLOCK_H__
+#define __ZTFASTLOCK_H__
+
+#include "zthread/NonCopyable.h"
+#include "zthread/Exceptions.h"
+
+#include <assert.h>
+#include <CoreServices/CoreServices.h>
+//#include <Multiprocessing.h>
+
+namespace ZThread {
+
+/**
+ * @class FastLock
+ *
+ * @author Eric Crahen <http://www.code-foo.com>
+ * @date <2003-07-16T23:25:31-0400>
+ * @version 2.1.6
+ *
+ */ 
+class FastLock : private NonCopyable {
+    
+  MPCriticalRegionID _mtx;
+
+ public:
+  
+  /**
+   * Create a new FastLock. No safety or state checks are performed.
+   *
+   * @exception Initialization_Exception - not thrown
+   */
+  inline FastLock() {
+    
+    // Apple TN1071
+    static bool init = MPLibraryIsLoaded();
+    
+    if(!init || MPCreateCriticalRegion(&_mtx) != noErr) {
+      assert(0);
+      throw Initialization_Exception();
+    }
+
+  }
+  
+  /**
+   * Destroy a FastLock. No safety or state checks are performed.
+   */
+  inline ~FastLock() throw () {
+
+    OSStatus status = MPDeleteCriticalRegion(_mtx);
+    if(status != noErr) 
+      assert(false);
+
+  }
+  
+  /**
+   * Acquire an exclusive lock. No safety or state checks are performed.
+   *
+   * @exception Synchronization_Exception - not thrown
+   */
+  inline void acquire() {
+    
+    if(MPEnterCriticalRegion(_mtx, kDurationForever) != noErr)
+      throw Synchronization_Exception();
+
+  }
+
+  /**
+   * Try to acquire an exclusive lock. No safety or state checks are performed.
+   * This function returns immediately regardless of the value of the timeout
+   *
+   * @param timeout Unused
+   * @return bool
+   * @exception Synchronization_Exception - not thrown
+   */
+  inline bool tryAcquire(unsigned long timeout=0) {
+
+    OSStatus status = 
+      MPEnterCriticalRegion(_mtx, kDurationMillisecond * timeout);
+
+    switch(status) {
+      case kMPTimeoutErr:
+        return false;
+        
+      case noErr:
+        return true;
+        
+    } 
+    
+    assert(0);
+    throw Synchronization_Exception();
+
+  }
+  
+  /**
+   * Release an exclusive lock. No safety or state checks are performed.
+   * The caller should have already acquired the lock, and release it 
+   * only once.
+   * 
+   * @exception Synchronization_Exception - not thrown
+   */
+  inline void release() {
+    
+    if(MPExitCriticalRegion(_mtx) != noErr)
+      throw Synchronization_Exception();
+
+  }
+  
+  
+}; /* FastLock */
+
+
+};
+
+#endif
+
+
+