Path: utzoo!attcan!uunet!lll-winken!ames!pasteur!ucbvax!hplabs!hp-pcd!hpcvlx!bturner
From: bturner@hpcvlx.HP.COM (Bill Turner)
Newsgroups: comp.windows.ms
Subject: Re: Yield?
Message-ID: <106580013@hpcvlx.HP.COM>
Date: 9 Jan 89 17:42:51 GMT
References: <33575@grapevine.uucp>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 23

> how does one use the Yield call?

One doesn't.  If your application has windows, then Yield is a no-op.

If you want to yield control, you must empty the message queue.  That
means either calling GetMessage to empty the queue (and block till a
message arrives), or using PeekMessage.  Thus, you can do something
like:

    while (more processing required) {
	do processing;

	while (PeekMessage(&msg, hWnd, 0, 0, TRUE)) {
	    TranslateMessage(&msg);
	    DispatchMessage(&msg);
	}
    }

You do *NOT* want to throw away the messages comming in during this
loop, so you have to be careful of reentrancy problems.  As far as I know,
this is the only way to yield during message processing.

--Bill Turner