InterlockedExchange64 function
Sets a 64-bit variable to the specified value as an atomic operation.
To operate on a 16-bit variable, use the InterlockedExchange16 function.
To operate on a 32-bit variable, use the InterlockedExchange function.
Syntax
LONGLONG __cdecl InterlockedExchange64(
_Inout_ LONGLONG volatile *Target,
_In_ LONGLONG 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]
-
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 _InterlockedExchange64.
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 InterlockedExchangeAcquire64 instead.
Note This function is supported on Windows RT-based systems.
Note
Requirements
|
Minimum supported client | Windows Vista [desktop apps | Windows Store apps] |
|---|---|
|
Minimum supported server | Windows Server 2003 [desktop apps | Windows Store apps] |
|
Header |
|
See also
- Interlocked Variable Access
- InterlockedCompareExchange
- InterlockedExchange
- InterlockedExchangeAcquire
- InterlockedExchangeNoFence
- InterlockedExchange8
- InterlockedExchange16
- InterlockedExchange16Acquire
- InterlockedExchange16NoFence
- InterlockedExchangeAcquire64
- InterlockedExchangeNoFence64
- InterlockedExchangePointer
- InterlockedExchangePointerAcquire
- InterlockedExchangePointerNoFence
- InterlockedExchangeAdd
- InterlockedExchangeSubtract
- Synchronization Functions
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Build date: 12/18/2012
