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.
Minimum supported client
Windows 8 [desktop apps only]
Minimum supported server
Windows Server 2012 [desktop apps only]
- Interlocked Variable Access
- Synchronization Functions