BOUNCE rtl@rtlinux.org: Approval required: (fwd)

[Der Herr Hofrat <der.herr@hofr.at>]

>From owner-rtl Tue Jul 31 17:49:17 2001
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Reply-To: <sseeger@stellartec.com>
From: sseeger@stellartec.com (Steven Seeger)
To: <rtl@rtlinux.org>
Subject: pthread_wakeup_np blocks
Date: Tue, 31 Jul 2001 13:23:17 -0700
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Hey all. I'll make it simple, and if anyone wants to see the code I can post
it.

I set up some tasks which go through their own initialization and then
suspend themselves with pthread_suspend_np(pthread_self()).

My system revolves around a series of FIFOs, and the main one from the GUI
in user space sends a command say to play some audio (writes to a DAC on our
interface board housing the PC/104) and from there a funciton is called
which wakes up the audio thread. This works fine, but if I let the system
sit a while and then press something on the touch panel that should generate
a clicking sound, for example, the GUI will just sit there for about half a
second and then the audio will start.

Why do my tasks take this long to wakeup after they have been suspended for
several minutes?

The task is calling pthread_wait_np() at each run through the loop. The
audio task runs at a period of 122000 ns. Clock running in periodic mode.

Thanks!

Steve
sseeger@stellartec.com

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