JCL Help:LockedExchange@Int64@Int64

 JCL Help: LockedExchange Function

JCL Functions

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Summary

Thread safe exchange.

Pascal

 function LockedExchange(var Target: Integer; Value: Integer): Integer; overload;
function LockedExchange(var Target: Int64; Value: Int64): Int64; overload;

Parameters

Parameters	Description
var Target: Integer	The Target variable.
Value: Integer	The value to move into Target.

Return Value

The value of Target before the exchange.

Description

LockedExchange implements a thread safe exchange of two integer values. The function exchanges the values of Target and Value and returns the previous value of Target. The LockedXxx functions allow for a simple and efficient way for applications to synchronize access to and manipulate integer variables which are shared by multiple threads.

See Also

LockedAdd LockedSub LockedInc LockedDec

About

Unit

JclSynch

Donator

Azret Botash

Notes

The Win32 API provides similar functions. Look up InterlockedXxx in the Platform SDK.

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