X-Git-Url: http://git.liburcu.org/?p=userspace-rcu.git;a=blobdiff_plain;f=include%2Furcu%2Fwfqueue.h;fp=include%2Furcu%2Fwfqueue.h;h=2ba86248aa7095c4ca83e94b13769c073507a58c;hp=0000000000000000000000000000000000000000;hb=6893800a4d1cc14dff0395ddcd660a5138db183d;hpb=a59f39055b5ecb77b68cf78b9839aa9e8e4ec332

diff --git a/include/urcu/wfqueue.h b/include/urcu/wfqueue.h
new file mode 100644
index 0000000..2ba8624
--- /dev/null
+++ b/include/urcu/wfqueue.h
@@ -0,0 +1,125 @@
+#ifndef _URCU_WFQUEUE_H
+#define _URCU_WFQUEUE_H
+
+/*
+ * wfqueue.h
+ *
+ * Userspace RCU library - Queue with Wait-Free Enqueue/Blocking Dequeue
+ *
+ * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <pthread.h>
+#include <assert.h>
+#include <urcu/compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef CDS_WFQ_DEPRECATED
+#define CDS_WFQ_DEPRECATED	\
+	CDS_DEPRECATED("urcu/wfqueue.h is deprecated. Please use urcu/wfcqueue.h instead.")
+#endif
+
+/*
+ * Queue with wait-free enqueue/blocking dequeue.
+ * This implementation adds a dummy head node when the queue is empty to ensure
+ * we can always update the queue locklessly.
+ *
+ * Inspired from half-wait-free/half-blocking queue implementation done by
+ * Paul E. McKenney.
+ */
+
+struct cds_wfq_node {
+	struct cds_wfq_node *next;
+};
+
+struct cds_wfq_queue {
+	struct cds_wfq_node *head, **tail;
+	struct cds_wfq_node dummy;	/* Dummy node */
+	pthread_mutex_t lock;
+};
+
+#ifdef _LGPL_SOURCE
+
+#include <urcu/static/wfqueue.h>
+
+static inline CDS_WFQ_DEPRECATED
+void cds_wfq_node_init(struct cds_wfq_node *node)
+{
+	_cds_wfq_node_init(node);
+}
+
+static inline CDS_WFQ_DEPRECATED
+void cds_wfq_init(struct cds_wfq_queue *q)
+{
+	_cds_wfq_init(q);
+}
+
+static inline CDS_WFQ_DEPRECATED
+void cds_wfq_destroy(struct cds_wfq_queue *q)
+{
+	_cds_wfq_destroy(q);
+}
+
+static inline CDS_WFQ_DEPRECATED
+void cds_wfq_enqueue(struct cds_wfq_queue *q, struct cds_wfq_node *node)
+{
+	_cds_wfq_enqueue(q, node);
+}
+
+static inline CDS_WFQ_DEPRECATED
+struct cds_wfq_node *__cds_wfq_dequeue_blocking(struct cds_wfq_queue *q)
+{
+	return ___cds_wfq_dequeue_blocking(q);
+}
+
+static inline CDS_WFQ_DEPRECATED
+struct cds_wfq_node *cds_wfq_dequeue_blocking(struct cds_wfq_queue *q)
+{
+	return _cds_wfq_dequeue_blocking(q);
+}
+
+#else /* !_LGPL_SOURCE */
+
+extern CDS_WFQ_DEPRECATED
+void cds_wfq_node_init(struct cds_wfq_node *node);
+
+extern CDS_WFQ_DEPRECATED
+void cds_wfq_init(struct cds_wfq_queue *q);
+
+extern CDS_WFQ_DEPRECATED
+void cds_wfq_destroy(struct cds_wfq_queue *q);
+
+extern CDS_WFQ_DEPRECATED
+void cds_wfq_enqueue(struct cds_wfq_queue *q, struct cds_wfq_node *node);
+
+/* __cds_wfq_dequeue_blocking: caller ensures mutual exclusion between dequeues */
+extern CDS_WFQ_DEPRECATED
+struct cds_wfq_node *__cds_wfq_dequeue_blocking(struct cds_wfq_queue *q);
+
+extern CDS_WFQ_DEPRECATED
+struct cds_wfq_node *cds_wfq_dequeue_blocking(struct cds_wfq_queue *q);
+
+#endif /* !_LGPL_SOURCE */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _URCU_WFQUEUE_H */