glibc/nptl/sysdeps/unix/sysv/linux/aio_misc.h

/* Copyright (C) 2004 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.

   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; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#ifndef _AIO_MISC_H
# include_next <aio_misc.h>
# include <signal.h>
# include <sysdep.h>
# include <pthread.h>

# define aio_start_notify_thread __aio_start_notify_thread
# define aio_create_helper_thread __aio_create_helper_thread

extern inline void
__aio_start_notify_thread (void)
{
  sigset_t ss;
  sigemptyset (&ss);
  INTERNAL_SYSCALL_DECL (err);
  INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, &ss, NULL, _NSIG / 8);
}

extern inline int
__aio_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);
  INTERNAL_SYSCALL_DECL (err);
  INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, &ss, &oss, _NSIG / 8);

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

  /* Restore the signal mask.  */
  INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, &oss, NULL,
		    _NSIG / 8);

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