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/* sigwaiter.c - Signal handling functions.
Copyright (C) 2008 Free Software Foundation, Inc.
Written by Neal H. Walfield <neal@gnu.org>.
This file is part of the GNU Hurd.
The GNU Hurd 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 3 of
the License, or (at your option) any later version.
The GNU Hurd 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 this program. If not, see
<http://www.gnu.org/licenses/>. */
#include "sig-internal.h"
#include <hurd/futex.h>
struct sigwaiter *sigwaiters;
siginfo_t
sigwaiter_block (struct signal_state *ss, const sigset_t *restrict set)
{
assert (pthread_mutex_trylock (&sig_lock) == EBUSY);
assert (pthread_mutex_trylock (&ss->lock) == EBUSY);
assert (! ss->sigwaiter);
struct sigwaiter waiter;
waiter.next = sigwaiters;
if (waiter.next)
{
assert (! waiter.next->prev);
waiter.next->prev = &waiter;
}
waiter.prev = 0;
sigwaiters = &waiter;
waiter.ss = ss;
waiter.info.si_signo = 0;
waiter.signals = *set;
ss->sigwaiter = &waiter;
pthread_mutex_unlock (&ss->lock);
pthread_mutex_unlock (&sig_lock);
futex_wait (&waiter.info.si_signo, 0);
#ifndef NDEBUG
pthread_mutex_lock (&ss->lock);
ss->sigwaiter = 0;
pthread_mutex_unlock (&ss->lock);
#endif
assert (waiter.info.si_signo);
return waiter.info;
}
void
sigwaiter_unblock (struct sigwaiter *waiter)
{
assert (pthread_mutex_trylock (&sig_lock) == EBUSY);
assert (pthread_mutex_trylock (&waiter->ss->lock) == EBUSY);
struct sigwaiter *prev = waiter->prev;
struct sigwaiter *next = waiter->next;
if (next)
next->prev = prev;
if (prev)
prev->next = next;
else
sigwaiters = next;
sigdelset (&process_pending, waiter->info.si_signo);
sigdelset (&waiter->ss->pending, waiter->info.si_signo);
pthread_mutex_unlock (&waiter->ss->lock);
pthread_mutex_unlock (&sig_lock);
futex_wake (&waiter->info.si_signo, 1);
}
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