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

   1 /* Copyright (C) 2004, 2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _AIO_MISC_H
  21 # include_next <aio_misc.h>
  22 # include <limits.h>
  23 # include <pthread.h>
  24 # include <signal.h>
  25 # include <sysdep.h>
  26
  27 # define aio_start_notify_thread __aio_start_notify_thread
  28 # define aio_create_helper_thread __aio_create_helper_thread
  29
  30 extern inline void
  31 __aio_start_notify_thread (void)
  32 {
  33   sigset_t ss;
  34   sigemptyset (&ss);
  35   INTERNAL_SYSCALL_DECL (err);
  36   INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, &ss, NULL, _NSIG / 8);
  37 }
  38
  39 extern inline int
  40 __aio_create_helper_thread (pthread_t *threadp, void *(*tf) (void *),
  41                             void *arg)
  42 {
  43   pthread_attr_t attr;
  44
  45   /* Make sure the thread is created detached.  */
  46   pthread_attr_init (&attr);
  47   pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
  48
  49   /* The helper thread needs only very little resources.  */
  50   (void) pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);
  51
  52   /* Block all signals in the helper thread.  To do this thoroughly we
  53      temporarily have to block all signals here.  */
  54   sigset_t ss;
  55   sigset_t oss;
  56   sigfillset (&ss);
  57   INTERNAL_SYSCALL_DECL (err);
  58   INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, &ss, &oss, _NSIG / 8);
  59
  60   int ret = pthread_create (threadp, &attr, tf, arg);
  61
  62   /* Restore the signal mask.  */
  63   INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, &oss, NULL,
  64                     _NSIG / 8);
  65
  66   (void) pthread_attr_destroy (&attr);
  67   return ret;
  68 }
  69 #endif