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