InterlockedCompareExchange64¶

function InterlockedCompareExchange64(var Target: Int64; 
                                     NewValue: Int64; Comperand: Int64)
                                      : Int64;

function InterlockedCompareExchange64(var Target: QWord; 
                                     NewValue: QWord; Comperand: QWord)
                                      : QWord;external name 'FPC_INTERLOCKEDCOMPAREEXCHANGE64';