100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
/*
|
|
* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
|
|
* (C) 2010 by On-Waves
|
|
* All Rights Reserved
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 Affero General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
#include <thread.h>
|
|
|
|
#include <osmocore/talloc.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
static void *tall_ctx_thr;
|
|
|
|
static int thread_finish(struct thread_notifier *not)
|
|
{
|
|
pthread_mutex_destroy(¬->guard);
|
|
close(not->fd[0]);
|
|
close(not->fd[1]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void thread_init(void)
|
|
{
|
|
tall_ctx_thr = talloc_named_const(NULL, 1, "threads");
|
|
}
|
|
|
|
struct thread_notifier *thread_notifier_alloc()
|
|
{
|
|
struct thread_notifier *not = talloc_zero(tall_ctx_thr, struct thread_notifier);
|
|
if (!not)
|
|
return NULL;
|
|
|
|
if (socketpair(AF_UNIX, SOCK_STREAM, 0, not->fd) == -1) {
|
|
talloc_free(not);
|
|
return NULL;
|
|
}
|
|
|
|
if (pthread_mutex_init(¬->guard, NULL) != 0) {
|
|
close(not->fd[0]);
|
|
close(not->fd[1]);
|
|
talloc_free(not);
|
|
return NULL;
|
|
}
|
|
|
|
not->bfd.fd = not->fd[1];
|
|
INIT_LLIST_HEAD(¬->__head1);
|
|
INIT_LLIST_HEAD(¬->__head2);
|
|
not->main_head = ¬->__head1;
|
|
not->thread_head = ¬->__head2;
|
|
talloc_set_destructor(not, thread_finish);
|
|
return not;
|
|
}
|
|
|
|
void thread_safe_add(struct thread_notifier *not, struct llist_head *_new)
|
|
{
|
|
char c;
|
|
pthread_mutex_lock(¬->guard);
|
|
|
|
llist_add_tail(_new, not->thread_head);
|
|
if (!not->no_write && write(not->fd[0], &c, sizeof(c)) != 1) {
|
|
fprintf(stderr, "BAD NEWS. Socket write failed.\n");
|
|
}
|
|
|
|
pthread_mutex_unlock(¬->guard);
|
|
}
|
|
|
|
void thread_swap(struct thread_notifier *not)
|
|
{
|
|
pthread_mutex_lock(¬->guard);
|
|
|
|
if (not->main_head == ¬->__head1) {
|
|
not->main_head = ¬->__head2;
|
|
not->thread_head = ¬->__head1;
|
|
} else {
|
|
not->main_head = ¬->__head1;
|
|
not->thread_head = ¬->__head2;
|
|
}
|
|
|
|
pthread_mutex_unlock(¬->guard);
|
|
}
|