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#ifndef _ATOMIC_INT_GENERIC_H
#define _ATOMIC_INT_GENERIC_H
#include "mt.h"
namespace mt{
class atomicInt
{
public:
atomicInt()
{
_q_value = 0;
}
atomicInt( int value )
{
_q_value = value;
}
// atomic API
/**
Reads the current _q_value of this QAtomicInt and then adds valueToAdd
to the current _q_value, returning the original _q_value.
*/
inline int fetchAndAddAcquire( int valueToAdd )
{
mutexlocker lock(&m);
int originalValue = _q_value;
_q_value += valueToAdd;
return originalValue;
}
/**
Atomically increments the _q_value of this atomicInt.
Returns true if the new _q_value is non-zero, false otherwise.*/
inline bool ref()
{
mutexlocker lock(&m);
return ++_q_value != 0;
}
/*
Atomically decrements the _q_value of this QAtomicInt.
Returns true if the new _q_value is non-zero, false otherwise.*/
inline bool deref()
{
mutexlocker lock(&m);
return --_q_value != 0;
}
/*
If the current _q_value of this QAtomicInt is the expectedValue,
the test-and-set functions assign the newValue to this QAtomicInt
and return true. If the values are not the same, this function
does nothing and returns false.
*/
inline bool testAndSetOrdered(int expectedValue, int newValue)
{
mutexlocker lock(&m);
if (_q_value == expectedValue) {
_q_value = newValue;
return true;
}
return false;
}
// Non-atomic API
inline bool operator==(int value) const
{
return _q_value == value;
}
inline bool operator!=(int value) const
{
return _q_value != value;
}
inline bool operator!() const
{
return _q_value == 0;
}
inline operator int() const
{
return _q_value;
}
inline atomicInt &operator=(int value)
{
_q_value = value;
return *this;
}
inline bool operator>(int value) const
{
return _q_value > value;
}
inline bool operator<(int value) const
{
return _q_value < value;
}
private:
volatile int _q_value;
mutex m;
};
}//namespace
#endif
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