From: Andrew Lunn <andrew@lunn.ch>
To: Laurie Gellatly <laurie.gellatly@netic.com>
Cc: ecos-discuss@sources.redhat.com
Subject: Re: [ECOS] building and debugging
Date: Tue, 20 Feb 2007 19:32:00 -0000 [thread overview]
Message-ID: <20070220193159.GB15919@lunn.ch> (raw)
In-Reply-To: <OBEELMDOHGDFDEMJCJCJMEFELKAA.laurie.gellatly@netic.com>
On Mon, Feb 19, 2007 at 06:22:56PM +1100, Laurie Gellatly wrote:
> Hi All,
> I've been using eclipse to develop my arm based system for some time.
> The application runs multiple threads and I had been able to debug them
> reasonably well (the program did not always flow the way I expected when
> single stepping and sometimes local variables are not able to be displayed).
Try disabling the optimizer, i.e. remove the -O2 flag. It will then
flow in a more logical, but less efficient way.
> What I have now is that although the main thread seems to be able to be
> debugged, the other threads have problems.
> I can set a breakpoint in a thread and it will stop, but single stepping or
> trying to display local variables etc no longer works.
Part of the problem is that gdb is not fully thread aware. It cannot
stop a thread context change at a time slice. It cannot stop a higher
priority thread taking over, it cannot stop a timer tick happening
etc. So when every you do a single step something else can take over
control from the current thread. What you can do is run the thread you
are trying to debug at a higher priority than anything else. That will
reduce the likelihood of it being preempted. However if you are
looking for a race condition this is not going to help you...
Andrew
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Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
next prev parent reply other threads:[~2007-02-20 19:32 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-18 17:51 [ECOS] i2c questions Grant Edwards
2007-02-18 18:57 ` [ECOS] " Grant Edwards
2007-02-18 21:56 ` Grant Edwards
2007-02-19 7:23 ` [ECOS] building and debugging Laurie Gellatly
2007-02-20 19:32 ` Andrew Lunn [this message]
[not found] <519508.74681.qm@web62310.mail.re1.yahoo.com>
2007-02-21 10:04 ` Laurie Gellatly
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