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InterlockedExchangeAcquire function

Sets a 32-bit variable to the specified value as an atomic operation. The operation is performed using acquire memory ordering semantics.

Syntax

LONG __cdecl InterlockedExchangeAcquire(
  _Inout_ LONG volatile *Target,
  _In_    LONG          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 _InterlockedExchange_acq.

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

 

Requirements

Header

Winnt.h (include Windows.h)

See also

Interlocked Variable Access

InterlockedCompareExchange

InterlockedExchange

InterlockedExchangeNoFence

InterlockedExchange8

InterlockedExchange16

InterlockedExchange16Acquire

InterlockedExchange16NoFence

InterlockedExchange64

InterlockedExchangeAcquire64

InterlockedExchangeNoFence64

InterlockedExchangePointer

InterlockedExchangePointerAcquire

InterlockedExchangePointerNoFence

InterlockedExchangeAdd

InterlockedExchangeSubtract

Synchronization Functions