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f26d456b98
The __NSIG_WORDS value is based on minimum number of words to hold the maximum number of signals supported by the architecture. This patch also adds __NSIG_BYTES, which is the number of bytes required to represent the supported number of signals. It is used in syscalls which takes a sigset_t. Checked on x86_64-linux-gnu and i686-linux-gnu. Tested-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/* Copyright (C) 2004-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <https://www.gnu.org/licenses/>. */
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#ifndef _AIO_MISC_H
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# include_next <aio_misc.h>
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# include <limits.h>
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# include <pthread.h>
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# include <signal.h>
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# include <sysdep.h>
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# define aio_start_notify_thread __aio_start_notify_thread
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# define aio_create_helper_thread __aio_create_helper_thread
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extern inline void
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__aio_start_notify_thread (void)
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{
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sigset_t ss;
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sigemptyset (&ss);
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INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_SETMASK, &ss, NULL,
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__NSIG_BYTES);
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}
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extern inline int
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__aio_create_helper_thread (pthread_t *threadp, void *(*tf) (void *),
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void *arg)
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{
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pthread_attr_t attr;
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/* Make sure the thread is created detached. */
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pthread_attr_init (&attr);
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pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
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/* The helper thread needs only very little resources. */
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(void) pthread_attr_setstacksize (&attr, __pthread_get_minstack (&attr));
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/* Block all signals in the helper thread. To do this thoroughly we
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temporarily have to block all signals here. */
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sigset_t ss;
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sigset_t oss;
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sigfillset (&ss);
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INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_SETMASK, &ss, &oss,
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__NSIG_BYTES);
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int ret = pthread_create (threadp, &attr, tf, arg);
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/* Restore the signal mask. */
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INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_SETMASK, &oss, NULL,
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__NSIG_BYTES);
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(void) pthread_attr_destroy (&attr);
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return ret;
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}
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#endif
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