Re: Callback mechanics

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#5952

From: Remy Lebeau (TeamB)
Date: Wed, 22 Jun 2005 06:26

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"AlexB" <b.a.v@inbox.ru> wrote in message
news:42b8e174$1@newsgroups.borland.com...

> // main thread, multimedia timer
> mmt=timeSetEvent(

A multimedia timer is essentially just a worker thread that calls the
callback function in a loop.

> while(1)            // forever
> { // VCL in progress
>   StringList->Lines->Add(...);
> }
>
> ...
> void CALLBACK mmtCallback(UINT wTimerID, UINT msg,
>      DWORD dwUser, DWORD dw1, DWORD dw2)
> {
>   StringList->Lines->Add(...);
> }

That code is not thread-safe.  You must protect access to the TStringList by
using a synchronization object, such as a critical section, mutex,
semaphore, etc.


Gambit

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Subject: Re: Callback mechanics
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