4cd4b135860c2c59ac5c88bfe9298eaff3a1adfe
[urcu.git] / urcu / wfqueue.h
1 #ifndef _URCU_WFQUEUE_H
2 #define _URCU_WFQUEUE_H
3
4 /*
5 * wfqueue.h
6 *
7 * Userspace RCU library - Queue with Wait-Free Enqueue/Blocking Dequeue
8 *
9 * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 *
11 * This library is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
15 *
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this library; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26 #include <pthread.h>
27 #include <assert.h>
28 #include <urcu/compiler.h>
29
30 #ifdef __cplusplus
31 extern "C" {
32 #endif
33
34 #ifndef CDS_WFQ_DEPRECATED
35 #define CDS_WFQ_DEPRECATED \
36 CDS_DEPRECATED("urcu/wfqueue.h is deprecated. Please use urcu/wfcqueue.h instead.")
37 #endif
38
39 /*
40 * Queue with wait-free enqueue/blocking dequeue.
41 * This implementation adds a dummy head node when the queue is empty to ensure
42 * we can always update the queue locklessly.
43 *
44 * Inspired from half-wait-free/half-blocking queue implementation done by
45 * Paul E. McKenney.
46 */
47
48 struct cds_wfq_node {
49 struct cds_wfq_node *next;
50 };
51
52 struct cds_wfq_queue {
53 struct cds_wfq_node *head, **tail;
54 struct cds_wfq_node dummy; /* Dummy node */
55 pthread_mutex_t lock;
56 };
57
58 #ifdef _LGPL_SOURCE
59
60 #include <urcu/static/wfqueue.h>
61
62 static inline CDS_WFQ_DEPRECATED
63 void cds_wfq_node_init(struct cds_wfq_node *node)
64 {
65 _cds_wfq_node_init(node);
66 }
67
68 static inline CDS_WFQ_DEPRECATED
69 void cds_wfq_init(struct cds_wfq_queue *q)
70 {
71 _cds_wfq_init(q);
72 }
73
74 static inline CDS_WFQ_DEPRECATED
75 void cds_wfq_enqueue(struct cds_wfq_queue *q, struct cds_wfq_node *node)
76 {
77 _cds_wfq_enqueue(q, node);
78 }
79
80 static inline CDS_WFQ_DEPRECATED
81 struct cds_wfq_node *__cds_wfq_dequeue_blocking(struct cds_wfq_queue *q)
82 {
83 return ___cds_wfq_dequeue_blocking(q);
84 }
85
86 static inline CDS_WFQ_DEPRECATED
87 struct cds_wfq_node *cds_wfq_dequeue_blocking(struct cds_wfq_queue *q)
88 {
89 return _cds_wfq_dequeue_blocking(q);
90 }
91
92 #else /* !_LGPL_SOURCE */
93
94 extern CDS_WFQ_DEPRECATED
95 void cds_wfq_node_init(struct cds_wfq_node *node);
96
97 extern CDS_WFQ_DEPRECATED
98 void cds_wfq_init(struct cds_wfq_queue *q);
99
100 extern CDS_WFQ_DEPRECATED
101 void cds_wfq_enqueue(struct cds_wfq_queue *q, struct cds_wfq_node *node);
102
103 /* __cds_wfq_dequeue_blocking: caller ensures mutual exclusion between dequeues */
104 extern CDS_WFQ_DEPRECATED
105 struct cds_wfq_node *__cds_wfq_dequeue_blocking(struct cds_wfq_queue *q);
106
107 extern CDS_WFQ_DEPRECATED
108 struct cds_wfq_node *cds_wfq_dequeue_blocking(struct cds_wfq_queue *q);
109
110 #endif /* !_LGPL_SOURCE */
111
112 #ifdef __cplusplus
113 }
114 #endif
115
116 #endif /* _URCU_WFQUEUE_H */
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