JCL Help:LockedExchangeSub@Int64@Int64

 JCL Help: LockedExchangeSub Function

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Summary

Thread safe subtraction.

Pascal

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

Parameters

Parameters	Description
var Target: Integer	The Target variable to manipulate.
Value: Integer	The value to subtract from Target.

Return Value

The value of Target before the subtraction.

Description

LockedExchangeSub implements threadsafe subtraction for integers. The function subtracts Value from Target and returns the old 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

LockedExchangeAdd LockedExchange LockedExchangeInc LockedExchangeDec

About

Unit

JclSynch

Donator

Azret Botash

Notes

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

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