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