Messages in this thread | | | Date | Fri, 3 Feb 2012 20:30:25 +0400 | From | Cyrill Gorcunov <> | Subject | Re: [PATCH] ptrace: add ability to get clear_tid_address |
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On Fri, Feb 03, 2012 at 08:25:19AM -0800, Tejun Heo wrote: > On Fri, Feb 03, 2012 at 02:11:23PM +0300, Andrew Vagin wrote: > > Zero is written at clear_tid_address, when the process exits. > > This functionality is used by pthread_join(). > > > > sys_set_tid_address() changes this address for current task. > > > > Before this patch clear_tid_address could not be got from user space. > > I want to dump a full state of a task, so I need this address. > > Also I think it may be useful for debugging a multithreading program. > > > > I am not sure that ptrace is suitable place. It may be added in prctl, > > but I think it's a bit useless and strange. I can't image a real > > situation (avoid checkpointing) when a thread will want to get own > > clear_tid_address from itself, this address is used by parent ussually. > > > > Signed-off-by: Andrew Vagin <avagin@openvz.org> > > Ummm... this really doesn't fit in ptrace. Cyrill, why not put it > together with other params you're exporting? >
We could add it to /proc/pid/stat (but I fear Andrew Morton shoot me then ;)
Cyrill
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