Subject: sleep, usleep, and nanosleep vs. pthreads?
To: None <firstname.lastname@example.org>
From: Steven M. Bellovin <email@example.com>
Date: 09/17/2005 18:32:39
I'm trying to get gtkpod working on NetBSD. When I ran it, it went
into an CPU-chewing loop in the following code:
/* keep space_ipod_free/used updated in regular intervals */
static gpointer th_space_thread (gpointer gp)
if (!space_uptodate) th_space_update ();
Contrary to the usleep call -- SPACE_TIMEOUT is 4000, so it should have
been a 4-second sleep -- it seemed to return either immediately or
virtually immediately. Changing it to use nanosleep didn't help.
However, using sleep() made it work.
I'm puzzled. However, I know nothing of pthreads, so I don't know if
some special invocation should have been used by gtkpod to make that
work. The problem with usleep occurs on 2.0 and -current; the fix
works on -current and hasn't been tried yet on 2.0.
--Steven M. Bellovin, http://www.cs.columbia.edu/~smb