InterlockedExchange function (winnt.h)
Sets a 32-bit variable to the specified value as an atomic operation.
To operate on a pointer variable, use the InterlockedExchangePointer function.
To operate on a 16-bit variable, use the InterlockedExchange16 function.
To operate on a 64-bit variable, use the InterlockedExchange64 function.
LONG InterlockedExchange( [in, out] LONG volatile *Target, [in] LONG Value );
[in, out] Target
A pointer to the value to be exchanged. The function sets this variable to Value, and returns its prior value.
The value to be exchanged with the value pointed to by Target.
The function returns the initial value of the Target parameter.
The interlocked functions provide a simple mechanism for synchronizing access to a variable that is shared by multiple threads. This function is atomic with respect to calls to other interlocked functions.
This function is implemented using a compiler intrinsic where possible. For more information, see the WinBase.h header file and _InterlockedExchange.
This function generates a full memory barrier (or fence) to ensure that memory operations are completed in order.
Itanium-based systems: For performance-critical applications, use InterlockedExchangeAcquire instead.
|Minimum supported client||Windows XP [desktop apps | UWP apps]|
|Minimum supported server||Windows Server 2003 [desktop apps | UWP apps]|
|Header||winnt.h (include Windows.h)|