Path: utzoo!utgpu!cunews!bnrgate!brtph3!brchh104!brchs1!bnr.ca!rice.edu!sun-spots-request
From: onecom!mason@cs.utexas.edu (Jeff Mason)
Newsgroups: comp.sys.sun
Subject: Sunview and select - or how to watch the cpu meter get pegged
Keywords: Windows
Message-ID: <1309@brchh104.bnr.ca>
Date: 16 Jan 91 22:35:44 GMT
Sender: news@brchh104.bnr.ca
Organization: Sun-Spots
Lines: 17
Approved: Sun-Spots@rice.edu
X-Sun-Spots-Digest: Volume 10, Issue 17, message 12
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I have a problem that somebody else might have a solution for.  I am
currently converting a large Objective-C program to be a nicely behaved
Sunview application.  

I am using the notifier in an implicit dispatch mode (I call
notify_do_dispatch(); my input loop consists of a call to
select(x,y,..,NULL) and then a read of an internal buffer which is filled
by my input proc.) My call to select has 2 read fds which I am interested
in - one for the input and one for a Socket which I need to monitor.  

The problem is that when I go into the select and do nothing (i.e. no
input from either keyboard/mouse or Socket), the cpu meter hits the roof.
I know that Sunview has overridden the select system call.  This sort of
behaviour makes me worried that a poll is happening within the select
which seems to defeat its purpose.  What is going on here ??

Thanks in advance.