76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
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/*
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Copyright (c) 2007-2015 by Jakob Schröter <js@camaya.net>
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This file is part of the gloox library. http://camaya.net/gloox
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This software is distributed under a license. The full license
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agreement can be found in the file LICENSE in this distribution.
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This software may not be copied, modified, sold or distributed
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other than expressed in the named license agreement.
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This software is distributed without any warranty.
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*/
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#ifndef ATOMICREFCOUNT_H__
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#define ATOMICREFCOUNT_H__
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#include "macros.h"
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#include "mutex.h"
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namespace gloox
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{
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namespace util
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{
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/**
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* @brief A simple implementation of a thread safe 32-bit
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* reference count. Native functions are used where possible.
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* When not available, a mutex is used for locking and unlocking.
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*
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* @author Daniel Bowen
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* @author Jakob Schröter <js@camaya.net>
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* @since 1.0.1
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*/
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class GLOOX_API AtomicRefCount
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{
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public:
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/**
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* Contructs a new atomic reference count.
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*/
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AtomicRefCount();
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/**
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* Increments the reference count, and returns the new value.
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* @return The new value.
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*/
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int increment();
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/**
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* Decrements the reference count, and returns the new value.
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* @return The new value.
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*/
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int decrement();
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/**
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* Resets the reference count to zero.
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* @since 1.0.4
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*/
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void reset();
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private:
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AtomicRefCount& operator=( const AtomicRefCount& );
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volatile int m_count;
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// The mutex is only used if a native function is unavailable.
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Mutex m_lock;
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};
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}
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}
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#endif // ATOMICREFCOUNT_H__
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