InterlockedIncrement

The InterlockedIncrement function both increments (increases by one) the value of the specified 32-bit variable and checks the resulting value. The function prevents more than one thread from using the same variable simultaneously.

LONG InterlockedIncrement(

LPLONG lpAddend	// address of the variable to increment
);

Parameters

lpAddend

Points to the 32-bit variable to increment.

Return Values

If the result of the increment is zero, the return value is zero.

If the result of the increment is less than zero, the return value is less than zero. If the result of the increment is greater than zero, the return value is greater than zero. A nonzero return value may not be equal to the result of the increment.

Remarks

The functions InterlockedIncrement, InterlockedCompareExchange, InterlockedDecrement, InterlockedExchange, and InterlockedExchangeAdd provide a simple mechanism for synchronizing access to a variable that is shared by multiple threads. The threads of different processes can use this mechanism if the variable is in shared memory.

The variable pointed to by the lpAddend parameter must be aligned on a 32-bit boundary; otherwise, this function will fail on multiprocessor x86 systems.

See Also

InterlockedCompareExchange, InterlockedDecrement, InterlockedExchange, InterlockedExchangeAdd

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