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/*
* (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 <osmocom/core/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 = 1;
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);
}
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