56 lines
2.3 KiB
C++
56 lines
2.3 KiB
C++
/*
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Copyright 2005-2016 Intel Corporation. All Rights Reserved.
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This file is part of Threading Building Blocks. Threading Building Blocks is free software;
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you can redistribute it and/or modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation. Threading Building Blocks is
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distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details. You should have received a copy of
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the GNU General Public License along with Threading Building Blocks; if not, write to the
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Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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As a special exception, you may use this file as part of a free software library without
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restriction. Specifically, if other files instantiate templates or use macros or inline
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functions from this file, or you compile this file and link it with other files to produce
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an executable, this file does not by itself cause the resulting executable to be covered
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by the GNU General Public License. This exception does not however invalidate any other
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reasons why the executable file might be covered by the GNU General Public License.
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*/
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#ifndef __TBB_null_rw_mutex_H
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#define __TBB_null_rw_mutex_H
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#include "tbb_stddef.h"
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namespace tbb {
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//! A rw mutex which does nothing
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/** A null_rw_mutex is a rw mutex that does nothing and simulates successful operation.
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@ingroup synchronization */
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class null_rw_mutex : internal::mutex_copy_deprecated_and_disabled {
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public:
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//! Represents acquisition of a mutex.
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class scoped_lock : internal::no_copy {
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public:
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scoped_lock() {}
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scoped_lock( null_rw_mutex& , bool = true ) {}
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~scoped_lock() {}
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void acquire( null_rw_mutex& , bool = true ) {}
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bool upgrade_to_writer() { return true; }
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bool downgrade_to_reader() { return true; }
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bool try_acquire( null_rw_mutex& , bool = true ) { return true; }
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void release() {}
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};
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null_rw_mutex() {}
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// Mutex traits
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static const bool is_rw_mutex = true;
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static const bool is_recursive_mutex = true;
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static const bool is_fair_mutex = true;
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};
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}
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#endif /* __TBB_null_rw_mutex_H */
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