/*
    Copyright 2005-2018 Intel Corporation.

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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 */
