null_rw_mutex.h Source File

00001 /*
00002     Copyright 2005-2009 Intel Corporation.  All Rights Reserved.
00003 
00004     The source code contained or described herein and all documents related
00005     to the source code ("Material") are owned by Intel Corporation or its
00006     suppliers or licensors.  Title to the Material remains with Intel
00007     Corporation or its suppliers and licensors.  The Material is protected
00008     by worldwide copyright laws and treaty provisions.  No part of the
00009     Material may be used, copied, reproduced, modified, published, uploaded,
00010     posted, transmitted, distributed, or disclosed in any way without
00011     Intel's prior express written permission.
00012 
00013     No license under any patent, copyright, trade secret or other
00014     intellectual property right is granted to or conferred upon you by
00015     disclosure or delivery of the Materials, either expressly, by
00016     implication, inducement, estoppel or otherwise.  Any license under such
00017     intellectual property rights must be express and approved by Intel in
00018     writing.
00019 */
00020 
00021 #ifndef __TBB_null_rw_mutex_H
00022 #define __TBB_null_rw_mutex_H
00023 
00024 namespace tbb {
00025     
00027 
00029 class null_rw_mutex {
00031     null_rw_mutex( const null_rw_mutex& );   
00032     void operator=( const null_rw_mutex& );   
00033 public:   
00035     class scoped_lock {   
00036     public:   
00037         scoped_lock() {}
00038         scoped_lock( null_rw_mutex& , bool = true ) {}
00039         ~scoped_lock() {}
00040         void acquire( null_rw_mutex& , bool = true ) {}
00041         bool upgrade_to_writer() { return true; }
00042         bool downgrade_to_reader() { return true; }
00043         bool try_acquire( null_rw_mutex& , bool = true ) { return true; }
00044         void release() {}
00045     };
00046   
00047     null_rw_mutex() {}
00048     
00049     // Mutex traits   
00050     static const bool is_rw_mutex = true;   
00051     static const bool is_recursive_mutex = true;
00052     static const bool is_fair_mutex = true;
00053 };  
00054 
00055 }
00056 
00057 #endif /* __TBB_null_rw_mutex_H */