lkml.org 
[lkml]   [2005]   [Aug]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] Re: 2.6.12: itimer_real timers don't survive execve() any more
Roland McGrath wrote:
>>There are other concerns. Let me see if I understand this. A thread
>>(other than the leader) can exec and we then need to change the
>>real_timer to wake the new task which will NOT be using the same task
>>struct.
>
>
> That's correct. de_thread will turn the thread calling exec into the new
> leader and kill off all the other threads, including the old leader. The
> exec'ing thread's existing task_struct is reassigned to the PID of the
> original leader.
>
>
>>My looking at the code shows that the thread leader can exit and then
>>stays around as a zombi until the last thread in the group exits.
>
>
> That is correct.
>
>
>>If an alarm comes during this wait I suspect it will wake this zombi and
>>cause problems.
>
>
> You are mistaken. The signal code handles process signals sent when the
> leader is a zombie. The group leader sticks around with the PID that
> matches the TGID, until there are no live threads with its TGID. That is
> how process-wide kill can still work.

Yes, I see, traced through the signal delivery. So Linus' patch as well
as the regression of Ingo's will fix all of this. Right?

--
George Anzinger george@mvista.com
HRT (High-res-timers): http://sourceforge.net/projects/high-res-timers/
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-08-06 02:55    [W:0.064 / U:0.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site