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From: bj@cbmvax.commodore.com (Brian Jackson)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: Window Waiting (was <None> )
Message-ID: <21912@cbmvax.commodore.com>
Date: 25 May 91 01:19:58 GMT
References: <1991May24.102345.1@wombat.newcastle.edu.au> <1991May24.092943.31027@kuhub.cc.ukans.edu>
Reply-To: bj@cbmvax.commodore.com (Brian Jackson)
Organization: Commodore, West Chester, PA
Lines: 56

In article <1991May24.092943.31027@kuhub.cc.ukans.edu> markv@kuhub.cc.ukans.edu writes:
>
>There are two solutions.  One, if you only wan't to update the display
>when your window is active, and if you aren't real picky about
>precision, try INTUITICKS messsage.  I do this to update a clock
>counter, recheck memory, like this:
>
>    while(!QuitFlag) {
>	WaitPort(MyWindow->UserPort);
>	while ((MyMsg = GetMsg(MyWindow->UserPort)) != NULL) {
>	    switch(MyMsg->Class) {
>		case INTUITICK:
>			if((TickCount++) % 10) == 0) {
>				DoUpdateStuff();
>			}
>			break;
>		case CLOSEWINDOW:
>			QuitFlag = FALSE;
>			break;
>		/* ... etc ... */
>	    }
>	    ReplyMsg(MyMsg);
>	}
>    }	
>
>Mark Gooderum

The only change that I would make to this is that the ReplyMsg() call
should come much sooner.  Let Intuition have it's message back asap.

	ULONG class ;

	...

	while((MyMsg = GetMsg(MyWindow->UserPort)) != NULL) {
		class = MyMsg->Class ;   /* make a local copy */
		ReplyMsg(MyMsg) ;        /* reply asap        */
		switch(class) {
			...
		}
	}

If 'DoUpdateStuff()' is large, you hang onto Intuition's message
for a long time. If Intuition can't find an existing message to use
for the NEXT thing it wants to send to you, it will allocate memory
for a new one rather than use one already in existance. 

Brian

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/ Brian Jackson  Software Engineer, Commodore-Amiga Inc.    GEnie: B.J. \
\ bj@cbmvax.cbm.commodore.com      or     ...{uunet|rutgers}!cbmvax!bj  /
/ "Anyone considering the purchase of a high-end Macintosh or IBM-      \
\ compatible computer should try an Amiga 3000 for a few hours before   /
/ making the final decision." - Consumer Reports ('91 Buying Guide)     \
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