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     
00026 class null_rw_mutex {
00028     null_rw_mutex( const null_rw_mutex& );   
00029     void operator=( const null_rw_mutex& );   
00030 public:   
00031     class scoped_lock {   
00032     public:   
00033         scoped_lock() {}
00034         scoped_lock( null_rw_mutex& , bool = true ) {}
00035         ~scoped_lock() {}
00036         void acquire( null_rw_mutex& , bool = true ) {}
00037         bool upgrade_to_writer() { return true; }
00038         bool downgrade_to_reader() { return true; }
00039         bool try_acquire( null_rw_mutex& , bool = true ) { return true; }
00040         void release() {}
00041     };
00042   
00043     null_rw_mutex() {}
00044     
00045     // Mutex traits   
00046     static const bool is_rw_mutex = true;   
00047     static const bool is_recursive_mutex = true;
00048     static const bool is_fair_mutex = true;
00049 };  
00050 
00051 }
00052 
00053 #endif /* __TBB_null_rw_mutex_H */