2 queue.h -- Thread-safe queue
3 Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #ifndef MESHLINK_QUEUE_H
21 #define MESHLINK_QUEUE_H
28 typedef struct meshlink_queue {
29 struct meshlink_queue_item *head;
30 struct meshlink_queue_item *tail;
31 pthread_mutex_t mutex;
34 typedef struct meshlink_queue_item {
36 struct meshlink_queue_item *next;
37 } meshlink_queue_item_t;
39 static inline bool meshlink_queue_push(meshlink_queue_t *queue, void *data) {
40 meshlink_queue_item_t *item = malloc(sizeof *item);
45 pthread_mutex_lock(&queue->mutex);
47 queue->head = queue->tail = item;
49 queue->tail = queue->tail->next = item;
50 pthread_mutex_unlock(&queue->mutex);
54 static inline void *meshlink_queue_pop(meshlink_queue_t *queue) {
55 meshlink_queue_item_t *item;
57 pthread_mutex_lock(&queue->mutex);
58 if((item = queue->head)) {
59 queue->head = item->next;
63 pthread_mutex_unlock(&queue->mutex);
64 data = item ? item->data : NULL;