Initial commit: Final state of the master project

Research/inc/tbb/null_mutex.h

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+/*
+    Copyright 2005-2015 Intel Corporation.  All Rights Reserved.
+
+    This file is part of Threading Building Blocks. Threading Building Blocks is free software;
+    you can redistribute it and/or modify it under the terms of the GNU General Public License
+    version 2  as  published  by  the  Free Software Foundation.  Threading Building Blocks 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 Threading Building Blocks; if not, write to the
+    Free Software Foundation, Inc.,  51 Franklin St,  Fifth Floor,  Boston,  MA 02110-1301 USA
+
+    As a special exception,  you may use this file  as part of a free software library without
+    restriction.  Specifically,  if other files instantiate templates  or use macros or inline
+    functions from this file, or you compile this file and link it with other files to produce
+    an executable,  this file does not by itself cause the resulting executable to be covered
+    by the GNU General Public License. This exception does not however invalidate any other
+    reasons why the executable file might be covered by the GNU General Public License.
+*/
+
+#ifndef __TBB_null_mutex_H
+#define __TBB_null_mutex_H
+
+#include "tbb_stddef.h"
+
+namespace tbb {
+    
+//! A mutex which does nothing
+/** A null_mutex does no operation and simulates success.
+    @ingroup synchronization */
+class null_mutex : internal::mutex_copy_deprecated_and_disabled {
+public:   
+    //! Represents acquisition of a mutex.
+    class scoped_lock : internal::no_copy {   
+    public:   
+        scoped_lock() {}
+        scoped_lock( null_mutex& ) {}   
+        ~scoped_lock() {}
+        void acquire( null_mutex& ) {}
+        bool try_acquire( null_mutex& ) { return true; }
+        void release() {}
+    };
+  
+    null_mutex() {}
+    
+    // Mutex traits   
+    static const bool is_rw_mutex = false;   
+    static const bool is_recursive_mutex = true;
+    static const bool is_fair_mutex = true;
+};  
+
+}
+
+#endif /* __TBB_null_mutex_H */