InterlockedExchange8 function
Sets an 8-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 32-bit variable, use the InterlockedExchange function.
To operate on a 64-bit variable, use the InterlockedExchange64 function.
Syntax
char __cdecl InterlockedExchange8( _Inout_ char volatile *Target, _In_ char Value );
Parameters
- 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]
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The value to be exchanged with the value pointed to by Target.
Return value
The function returns the initial value of the Target parameter.
Remarks
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 _InterlockedExchange8.
This function generates a full memory barrier (or fence) to ensure that memory operations are completed in order.
Requirements
|
Minimum supported client |
Windows 8 [desktop apps only] |
|---|---|
|
Minimum supported server |
Windows Server 2012 [desktop apps only] |
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Header |
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See also
- Interlocked Variable Access
- InterlockedCompareExchange
- InterlockedExchange
- InterlockedExchangeAcquire
- InterlockedExchangeNoFence
- InterlockedExchange16
- InterlockedExchange16Acquire
- InterlockedExchange16NoFence
- InterlockedExchange64
- InterlockedExchangeAcquire64
- InterlockedExchangeNoFence64
- InterlockedExchangePointer
- InterlockedExchangePointerAcquire
- InterlockedExchangePointerNoFence
- InterlockedExchangeAdd
- InterlockedExchangeSubtract
- Synchronization Functions