linux-kernel - Re: main thread pthread_exit/sys

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Message-Id: <20090205212234.934D1FC381@magilla.sf.frob.com>
Date:	Thu,  5 Feb 2009 13:22:34 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Kaz Kylheku <kkylheku@...il.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: main thread pthread_exit/sys_exit bug!

> Yes we have the bug, and wait_task_stopped() should be fixed. But it is
> buggy anyway, even if we delay the death of the main thread. But I also
> think we shouldn't.

Sorry, I'd missed the actual bug report among all the tangential verbiage.
I wrote this test case for it.  Is there any problem other than this one?


Thanks,
Roland

==========

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <pthread.h>
#include <assert.h>

static void *
thfunc (void *arg)
{
  sleep (2);
  puts ("stopping");
  raise (SIGSTOP);
  puts ("resumed");
  exit (0);
}

int
main (void)
{
  pthread_t th;
  int rc = pthread_create (&th, NULL, &thfunc, NULL);
  assert_perror (rc);
  pthread_exit (0);
  /*NOTREACHED*/
  return 1;
}
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