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    Copyright 2005-2018 Intel Corporation.  All Rights Reserved.

    The source code contained or described herein and all documents related
    to the source code ("Material") are owned by Intel Corporation or its
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    by worldwide copyright laws and treaty provisions.  No part of the
    Material may be used, copied, reproduced, modified, published, uploaded,
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    Intel's prior express written permission.

    No license under any patent, copyright, trade secret or other
    intellectual property right is granted to or conferred upon you by
    disclosure or delivery of the Materials, either expressly, by
    implication, inducement, estoppel or otherwise.  Any license under such
    intellectual property rights must be express and approved by Intel in
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*/

#ifndef __TBB_null_mutex_H
#define __TBB_null_mutex_H

#include "tbb_stddef.h"

namespace tbb {

//! A mutex which does nothing
/** A null_mutex does no operation and simulates success.
    @ingroup synchronization */
class null_mutex : internal::mutex_copy_deprecated_and_disabled {
public:
    //! Represents acquisition of a mutex.
    class scoped_lock : internal::no_copy {
    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 */
