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InterlockedExchangeAcquire64 function

Sets a 64-bit variable to the specified value as an atomic operation. The operation is performed using acquire memory ordering semantics.

Syntax

LONGLONG __cdecl InterlockedExchangeAcquire64(
  _Inout_ LONGLONG volatile Target,
  _In_    LONGLONG          Value
);

Parameters

  • Target [in, out]
    A pointer to the value to exchange. The function sets the value of this parameter to the value of the Value parameter, and returns the prior value of this parameter.

  • Value [in]
    The value to be compared to the value of the Target parameter.

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_acq.

Note  This function is supported on Windows RT-based systems.

 

Requirements

Minimum supported client

Windows Vista [desktop apps | UWP apps]

Minimum supported server

Windows Server 2003 [desktop apps | UWP apps]

Header

WinBase.h (include Windows.h)

See also

Interlocked Variable Access

InterlockedCompareExchange

InterlockedExchange

InterlockedExchangeAcquire

InterlockedExchangeNoFence

InterlockedExchange8

InterlockedExchange16

InterlockedExchange16Acquire

InterlockedExchange16NoFence

InterlockedExchange64

InterlockedExchangeNoFence64

InterlockedExchangePointer

InterlockedExchangePointerAcquire

InterlockedExchangePointerNoFence

InterlockedExchangeAdd

InterlockedExchangeSubtract

Synchronization Functions