00001 /* 00002 Copyright 2005-2013 Intel Corporation. All Rights Reserved. 00003 00004 This file is part of Threading Building Blocks. 00005 00006 Threading Building Blocks is free software; you can redistribute it 00007 and/or modify it under the terms of the GNU General Public License 00008 version 2 as published by the Free Software Foundation. 00009 00010 Threading Building Blocks is distributed in the hope that it will be 00011 useful, but WITHOUT ANY WARRANTY; without even the implied warranty 00012 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 GNU General Public License for more details. 00014 00015 You should have received a copy of the GNU General Public License 00016 along with Threading Building Blocks; if not, write to the Free Software 00017 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00018 00019 As a special exception, you may use this file as part of a free software 00020 library without restriction. Specifically, if other files instantiate 00021 templates or use macros or inline functions from this file, or you compile 00022 this file and link it with other files to produce an executable, this 00023 file does not by itself cause the resulting executable to be covered by 00024 the GNU General Public License. This exception does not however 00025 invalidate any other reasons why the executable file might be covered by 00026 the GNU General Public License. 00027 */ 00028 00029 #ifndef __TBB_null_rw_mutex_H 00030 #define __TBB_null_rw_mutex_H 00031 00032 namespace tbb { 00033 00035 00037 class null_rw_mutex { 00039 null_rw_mutex( const null_rw_mutex& ); 00040 void operator=( const null_rw_mutex& ); 00041 public: 00043 class scoped_lock { 00044 public: 00045 scoped_lock() {} 00046 scoped_lock( null_rw_mutex& , bool = true ) {} 00047 ~scoped_lock() {} 00048 void acquire( null_rw_mutex& , bool = true ) {} 00049 bool upgrade_to_writer() { return true; } 00050 bool downgrade_to_reader() { return true; } 00051 bool try_acquire( null_rw_mutex& , bool = true ) { return true; } 00052 void release() {} 00053 }; 00054 00055 null_rw_mutex() {} 00056 00057 // Mutex traits 00058 static const bool is_rw_mutex = true; 00059 static const bool is_recursive_mutex = true; 00060 static const bool is_fair_mutex = true; 00061 }; 00062 00063 } 00064 00065 #endif /* __TBB_null_rw_mutex_H */