1/* Copyright (C) 2004-2021 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
17 not, see <https://www.gnu.org/licenses/>. */
18
19#ifndef _AIO_MISC_H
20# include_next <aio_misc.h>
21# include <limits.h>
22# include <pthread.h>
23# include <signal.h>
24# include <sysdep.h>
25
26# define aio_start_notify_thread __aio_start_notify_thread
27# define aio_create_helper_thread __aio_create_helper_thread
28
29extern inline void
30__aio_start_notify_thread (void)
31{
32 sigset_t ss;
33 sigemptyset (&ss);
34 INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_SETMASK, &ss, NULL,
35 __NSIG_BYTES);
36}
37
38extern inline int
39__aio_create_helper_thread (pthread_t *threadp, void *(*tf) (void *),
40 void *arg)
41{
42 pthread_attr_t attr;
43
44 /* Make sure the thread is created detached. */
45 __pthread_attr_init (&attr);
46 __pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
47
48 /* The helper thread needs only very little resources. */
49 __pthread_attr_setstacksize (&attr, __pthread_get_minstack (&attr));
50
51 /* Block all signals in the helper thread. To do this thoroughly we
52 temporarily have to block all signals here. */
53 sigset_t ss;
54 sigset_t oss;
55 sigfillset (&ss);
56 INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_SETMASK, &ss, &oss,
57 __NSIG_BYTES);
58
59 int ret = __pthread_create (threadp, &attr, tf, arg);
60
61 /* Restore the signal mask. */
62 INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_SETMASK, &oss, NULL,
63 __NSIG_BYTES);
64
65 __pthread_attr_destroy (&attr);
66 return ret;
67}
68#endif
69