Skip to content

    InterlockedExchangeAdd

    Thread-safe add and exchange of 2 values.

    Declaration

    Source position: systemh.inc line 1642

    function InterlockedExchangeAdd(var Target: LongInt; Source: LongInt)
                                : LongInt;

    function InterlockedExchangeAdd(var Target: Pointer; Source: Pointer)
                                : Pointer;external name 'FPC_INTERLOCKEDEXCHANGEADD64';

    function InterlockedExchangeAdd(var Target: Cardinal; Source: Cardinal)
                                : Cardinal;external name 'FPC_INTERLOCKEDEXCHANGEADD';

    Description

    InterLockedExchangeAdd adds to Target the value of Source in a thread-safe way, and returns the old value of Target.This is done in a thread-safe way, i.e., only one processor is accessing the Target variable at a time.

    Errors

    None.

    See also

    Name Description
    InterLockedDecrement Thread-safe decrement.
    InterLockedIncrement Thread-safe increment.
    InterLockedExchange Exchange 2 integers in a thread-safe way.
    InterlockedCompareExchange Conditional exchange.