1 #ifndef MESHLINK_QUEUE_H
2 #define MESHLINK_QUEUE_H
5 queue.h -- Thread-safe queue
6 Copyright (C) 2014, 2017 Guus Sliepen <guus@meshlink.io>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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 void meshlink_queue_init(meshlink_queue_t *queue) {
42 pthread_mutex_init(&queue->mutex, NULL);
45 static inline void meshlink_queue_exit(meshlink_queue_t *queue) {
46 pthread_mutex_destroy(&queue->mutex);
49 static inline __attribute__((__warn_unused_result__)) bool meshlink_queue_push(meshlink_queue_t *queue, void *data) {
50 meshlink_queue_item_t *item = malloc(sizeof(*item));
59 if(pthread_mutex_lock(&queue->mutex) != 0) {
64 queue->head = queue->tail = item;
66 queue->tail = queue->tail->next = item;
69 pthread_mutex_unlock(&queue->mutex);
73 static inline __attribute__((__warn_unused_result__)) void *meshlink_queue_pop(meshlink_queue_t *queue) {
74 meshlink_queue_item_t *item;
76 if(pthread_mutex_lock(&queue->mutex) != 0) {
80 if((item = queue->head)) {
81 queue->head = item->next;
88 pthread_mutex_unlock(&queue->mutex);
90 void *data = item ? item->data : NULL;
95 static inline __attribute__((__warn_unused_result__)) void *meshlink_queue_pop_cond(meshlink_queue_t *queue, pthread_cond_t *cond) {
96 meshlink_queue_item_t *item;
98 if(pthread_mutex_lock(&queue->mutex) != 0) {
102 while(!queue->head) {
103 pthread_cond_wait(cond, &queue->mutex);
107 queue->head = item->next;
113 pthread_mutex_unlock(&queue->mutex);
115 void *data = item->data;