InterlockedCompare64Exchange128
InterlockedCompare64Exchange128 performs an atomic compare-and-exchange operation on the specified values. The function compares the specified 64-bit values and exchanges with the specified 128-bit value based on the outcome of the comparison.
Syntax
LONG64 InterlockedCompare64Exchange128( LONG64 volatile *Destination, LONG64 ExchangeHigh, LONG64 ExchangeLow, LONG64 Comparand );
Parameters
Destination
A pointer to the destination value.
ExchangeHigh
The high-order part of the exchange value.
ExchangeLow
The low-order part of the exchange value.
Comparand
The value to compare to Destination.
Return Value
The function returns the initial value of the Destination parameter.
Remarks
The 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 variable pointed to by the Destination parameter must be aligned on a 128-bit boundary.
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 _InterlockedCompare64Exchange128.
This function generates a full memory barrier (or fence) to ensure that memory operations are completed in order.
Requirements
Minimum Supported Version | RTX64 3.1 |
Header | windows.h |
Library | Rtx_Rtss.lib |
See Also: