Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!sunybcs!rutgers!cbmvax!peter
From: peter@cbmvax.commodore.com (Peter Cherna)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Wait()ing Peacefully
Message-ID: <10227@cbmvax.commodore.com>
Date: 16 Mar 90 23:33:10 GMT
References: <1990Mar16.214401.1738@spectre.ccsf.caltech.edu>
Reply-To: peter@cbmvax (Peter Cherna)
Distribution: comp
Organization: Commodore, West Chester, PA
Lines: 48

In article <1990Mar16.214401.1738@spectre.ccsf.caltech.edu> bdiscoe@tybalt.caltech.edu (Ben W. Discoe) writes:
>How do you Wait() on several ports simultaneously?  I know how to wait on,
>say, the serial device, console device and an IDCMP individually, but what
>I really need to do is wait on a message from any one of them.
>
>I tried:  waitflags = <port 1's bit> | <port 2's bit> |.... ;
>	  Wait(waitflags);
>but this didn't seem to work.

You can WaitPort() on a port, but you can only Wait() on a signal.
To be clear, you wait on the signal mask (for example 0000000010000000 binary)
and not on the signal bit number (for example signal #7).

So you see constructs like this all the time

	Wait( 1 << msgport->mp_SigBit );

which converts the signal bit number to a bit mask.  So if you have
multiple ports, say arexxport, intuiport, and timerport, you might say

	timermask = ( 1 << timerport->mp_SigBit );
	arexxmask = ( 1 << arexxport->mp_SigBit );
	intuimask = ( 1 << intuiport->mp_SigBit );

	signalmask = Wait( timermask | arexxmask | intuimask );

	if (signalmask & timermask)
	{
		/*  got a msg at timerport */
	}

	if (signalmask & arexxmask)
	{
		/*  got a msg at arexxport */
	}

	if (signalmask & intuimask)
	{
		/*  got a msg at intuiport */
	}

>-Ben "But I READ the manual!  Honest!"

     Peter
--
     Peter Cherna, Software Engineer, Commodore-Amiga, Inc.
     {uunet|rutgers}!cbmvax!peter    peter@cbmvax.cbm.commodore.com
My opinions do not necessarily represent the opinions of my employer.