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