/* Copyright (C) 2006 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/* We define a special synchronization primitive for AIO.  POSIX
   conditional variables would be ideal but the pthread_cond_*wait
   operations do not return on EINTR.  This is a requirement for
   correct aio_suspend and lio_listio implementations.  */

#include <assert.h>
#include <signal.h>

#undef DONT_NEED_GAI_MISC_COND

#define gai_start_notify_thread __gai_start_notify_thread
#define gai_create_helper_thread __gai_create_helper_thread

extern inline void
__gai_start_notify_thread (void)
{
  sigset_t ss;
  sigemptyset (&ss);
  sigprocmask (SIG_SETMASK, &ss, NULL);
}

extern inline int
__gai_create_helper_thread (pthread_t *threadp, void *(*tf) (void *),
			    void *arg)
{
  pthread_attr_t attr;

  /* Make sure the thread is created detached.  */
  pthread_attr_init (&attr);
  pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);

  /* The helper thread needs only very little resources.  */
  (void) pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);

  /* Block all signals in the helper thread.  To do this thoroughly we
     temporarily have to block all signals here.  */
  sigset_t ss;
  sigset_t oss;
  sigfillset (&ss);
  sigprocmask (SIG_SETMASK, &ss, &oss);

  int ret = pthread_create (threadp, &attr, tf, arg);

  /* Restore the signal mask.  */
  sigprocmask (SIG_SETMASK, &oss, NULL);

  (void) pthread_attr_destroy (&attr);
  return ret;
}

#include_next <gai_misc.h>