| /* |
| Copyright 2005-2010 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 |
| |
| namespace tbb { |
| |
| //! A mutex which does nothing |
| /** A null_mutex does no operation and simulates success. |
| @ingroup synchronization */ |
| class null_mutex { |
| //! Deny assignment and copy construction |
| null_mutex( const null_mutex& ); |
| void operator=( const null_mutex& ); |
| public: |
| //! Represents acquisition of a mutex. |
| class scoped_lock { |
| 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 */ |
