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    InterlockedExchange

    Exchange 2 integers in a thread-safe way.

    Declaration

    Source position: systemh.inc line 1641

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

    function InterlockedExchange(var Target: Pointer; Source: Pointer)
                             : Pointer;external name 'FPC_INTERLOCKEDEXCHANGE64';

    function InterlockedExchange(var Target: Cardinal; Source: Cardinal)
                             : Cardinal;external name 'FPC_INTERLOCKEDEXCHANGE';

    Description

    InterLockedExchange stores Source in Target 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.
    InterLockedExchangeAdd Thread-safe add and exchange of 2 values.
    InterlockedCompareExchange Conditional exchange.