Sets a 64-bit variable to the specified value as an atomic operation. The operation is performed atomically, but without using memory barriers.
To operate on a 16-bit variable, use the InterlockedExchange16NoFence function.
To operate on a 64-bit variable, use the InterlockedExchangeNoFence64 function.
- Target [in, out]
A pointer to the value to be exchanged. The function sets this variable to Value, and returns its prior value.
- Value [in]
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_nf.
This function generates no memory barriers (or fences) and does not guarantee that independent memory operations before or after it are completed in order.
Note This function is supported on Windows RT-based systems.
Minimum supported client
|Windows 8 [desktop apps only]|
Minimum supported server
|Windows Server 2012 [desktop apps only]|
- Interlocked Variable Access
- Synchronization Functions