InterlockedCompareExchange
Conditional exchange
Declaration
Source position: systemh.inc line 1530
function InterlockedCompareExchange(var Target: LongInt;
NewValue: LongInt;
Comperand: LongInt) : LongInt;
function InterlockedCompareExchange(var Target: Pointer;
NewValue: Pointer;
Comperand: Pointer) : Pointer;
function InterlockedCompareExchange(var Target: Cardinal;
NewValue: Cardinal;
Comperand: Cardinal) : Cardinal;
Description
InterlockedCompareExchange does an compare-and-exchange operation on the specified values in a thread-safe way. The function compares Target and Comperand and exchanges Target with NewValue if Target and Comperand are equal. It 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 |
| InterLockedExchange | Exchange 2 integers in a thread-safe way |
| InterLockedExchangeAdd | Thread-safe add and exchange of 2 values |
| InterLockedIncrement | Thread-safe increment |