2 Copyright 2005-2010 Intel Corporation. All Rights Reserved.
4 This file is part of Threading Building Blocks.
6 Threading Building Blocks is free software; you can redistribute it
7 and/or modify it under the terms of the GNU General Public License
8 version 2 as published by the Free Software Foundation.
10 Threading Building Blocks is distributed in the hope that it will be
11 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
12 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with Threading Building Blocks; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 As a special exception, you may use this file as part of a free software
20 library without restriction. Specifically, if other files instantiate
21 templates or use macros or inline functions from this file, or you compile
22 this file and link it with other files to produce an executable, this
23 file does not by itself cause the resulting executable to be covered by
24 the GNU General Public License. This exception does not however
25 invalidate any other reasons why the executable file might be covered by
26 the GNU General Public License.
29 #ifndef __TBB_null_mutex_H
30 #define __TBB_null_mutex_H
34 //! A mutex which does nothing
35 /** A null_mutex does no operation and simulates success.
36 @ingroup synchronization */
38 //! Deny assignment and copy construction
39 null_mutex( const null_mutex& );
40 void operator=( const null_mutex& );
42 //! Represents acquisition of a mutex.
46 scoped_lock( null_mutex& ) {}
48 void acquire( null_mutex& ) {}
49 bool try_acquire( null_mutex& ) { return true; }
56 static const bool is_rw_mutex = false;
57 static const bool is_recursive_mutex = true;
58 static const bool is_fair_mutex = true;
63 #endif /* __TBB_null_mutex_H */