Atomically compares the Destination and Comperand values. If the Destination value equals the Comperand value, the Exchange value is stored in the address specified by Destination. Otherwise, no action occurs. All operands are 32-bits.

If you are exchanging pointer values, this function supersedes InterlockedCompareExchange.

PVOID InterlockedCompareExchangePointer (
    PVOID volatile * Destination,
    PVOID Exchange,
    PVOID Comperand
);

Parameters

Destination

Pointer to the pointer to the destination value.

Exchange

Exchange value.

Comperand

Value to compare to Destination.

Remarks

The interlocked functions provide a simple mechanism for synchronizing access to a variable shared by multiple threads. If the variable is in shared memory, threads of different processes can use this mechanism.

Return Values

The destination's initial value.

Requirements

Note

This function operates in the real-time portion of your application.

See Also

InterlockedCompareExchange, iwin32 API, iwin32 Overview