/usr/include/tbb/null_rw_mutex.h is in libtbb-dev 4.2~20130725-1.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright 2005-2013 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_rw_mutex_H
#define __TBB_null_rw_mutex_H
namespace tbb {
//! A rw mutex which does nothing
/** A null_rw_mutex is a rw mutex that does nothing and simulates successful operation.
@ingroup synchronization */
class null_rw_mutex {
//! Deny assignment and copy construction
null_rw_mutex( const null_rw_mutex& );
void operator=( const null_rw_mutex& );
public:
//! Represents acquisition of a mutex.
class scoped_lock {
public:
scoped_lock() {}
scoped_lock( null_rw_mutex& , bool = true ) {}
~scoped_lock() {}
void acquire( null_rw_mutex& , bool = true ) {}
bool upgrade_to_writer() { return true; }
bool downgrade_to_reader() { return true; }
bool try_acquire( null_rw_mutex& , bool = true ) { return true; }
void release() {}
};
null_rw_mutex() {}
// Mutex traits
static const bool is_rw_mutex = true;
static const bool is_recursive_mutex = true;
static const bool is_fair_mutex = true;
};
}
#endif /* __TBB_null_rw_mutex_H */
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