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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

WinBase.h (include Windows.h)

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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