From: John Reiser <jreiser@BitWagon.com>
To: Daniel Jacobowitz <dan@debian.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: observe & control thread state for exit futex ?
Date: Tue, 15 Apr 2003 08:01:42 -0700 [thread overview]
Message-ID: <3E9C1ED6.9070005@BitWagon.com> (raw)
In-Reply-To: 20030414033548.GA4048@nevyn.them.org
Daniel Jacobowitz wrote:
> On Sun, Apr 13, 2003 at 07:52:08PM -0700, John Reiser wrote:
>
>>How can a debugger, newly attached to an arbitrary thread, determine whether
>>the thread has a pending exit futex and associated memory location to clear
>>[CLONE_CHILD_CLEARTID flag and child_tid_ptr parameter at __clone()]?
>>
>>If so, then how can the debugger determine the address, change the address,
>>cancel the futex, and/or intercept the notification?
>
>
> It can't. Even clone flags are not accessible.
>
> If you can think of a good reason that a debugger would need any
> particular piece of data, exposing it is very straightforward.
>
The debugger needs this information to determine the state of the thread.
An automated software audit program needs the information to verify
that threads are working correctly. In general, write-only state
[from the viewpoint of the thread] is a bad idea.
Would a new option to sys_prctl() be a good way to expose the data?
prev parent reply other threads:[~2003-04-15 14:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-14 2:52 observe & control thread state for exit futex ? John Reiser
2003-04-14 3:35 ` Daniel Jacobowitz
2003-04-15 15:01 ` John Reiser [this message]
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