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InterlockedCompareExchange16Release function

Performs an atomic compare-and-exchange operation on the specified values. The function compares two specified 16-bit values and exchanges with another 16-bit value based on the outcome of the comparison. The exchange is performed with release memory ordering semantics.

Syntax


short __cdecl InterlockedCompareExchange16Release(
  _Inout_  short volatile *Destination,
  _In_     short Exchange,
  _In_     short Comparand
);

Parameters

Destination [in, out]

A pointer to the destination value.

Exchange [in]

The exchange value.

Comparand [in]

The value to compare to Destination.

Return value

The function returns the initial value of the Destination parameter.

Remarks

This function compares the Destination value with the Comparand value. If the Destination value is equal to the Comparand value, the Exchange value is stored in the address specified by Destination. Otherwise, no operation is performed.

The variables for this function must be aligned on a 16-bit boundary; otherwise, this function will behave unpredictably on multiprocessor x86 systems and any non-x86 systems. See _aligned_malloc.

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 _InterlockedCompareExchange16_rel.

For processors that do not support release memory ordering semantics, this function is defined as a call to the InterlockedCompareExchange16 function. For more information, see WinBase.h.

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

Requirements

Minimum supported client

Windows 8 [desktop apps only]

Minimum supported server

Windows Server 2012 [desktop apps only]

Header

Winnt.h (include Windows.h)

See also

Interlocked Variable Access
InterlockedCompare64Exchange128
InterlockedCompareExchange
InterlockedCompareExchangeAcquire
InterlockedCompareExchangeRelease
InterlockedCompareExchangeNoFence
InterlockedCompareExchange16
InterlockedCompareExchange16Acquire
InterlockedCompareExchange16NoFence
InterlockedCompareExchange64
InterlockedCompareExchangeAcquire64
InterlockedCompareExchangeRelease64
InterlockedCompareExchangeNoFence64
InterlockedCompareExchange128
InterlockedCompareExchangePointer
InterlockedCompareExchangePointerAcquire
InterlockedCompareExchangePointerRelease
InterlockedCompareExchangePointerNoFence
Synchronization Functions

 

 

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