extern "C" {
#endif
-#if (!defined(_GNU_SOURCE) && !defined(_LGPL_SOURCE))
-#error "Dynamic loader LGPL wrappers not implemented yet"
+#ifndef CDS_WFQ_DEPRECATED
+#define CDS_WFQ_DEPRECATED \
+ CDS_DEPRECATED("urcu/wfqueue.h is deprecated. Please use urcu/wfcqueue.h instead.")
#endif
/*
* Paul E. McKenney.
*/
-struct wfq_node {
- struct wfq_node *next;
+struct cds_wfq_node {
+ struct cds_wfq_node *next;
};
-struct wfq_queue {
- struct wfq_node *head, **tail;
- struct wfq_node dummy; /* Dummy node */
+struct cds_wfq_queue {
+ struct cds_wfq_node *head, **tail;
+ struct cds_wfq_node dummy; /* Dummy node */
pthread_mutex_t lock;
};
-void wfq_node_init(struct wfq_node *node)
+#ifdef _LGPL_SOURCE
+
+#include <urcu/static/wfqueue.h>
+
+static inline CDS_WFQ_DEPRECATED
+void cds_wfq_node_init(struct cds_wfq_node *node)
{
- node->next = NULL;
+ _cds_wfq_node_init(node);
}
-void wfq_init(struct wfq_queue *q)
+static inline CDS_WFQ_DEPRECATED
+void cds_wfq_init(struct cds_wfq_queue *q)
{
- int ret;
-
- wfq_node_init(&q->dummy);
- /* Set queue head and tail */
- q->head = &q->dummy;
- q->tail = &q->dummy.next;
- ret = pthread_mutex_init(&q->lock, NULL);
- assert(!ret);
+ _cds_wfq_init(q);
}
-void wfq_enqueue(struct wfq_queue *q, struct wfq_node *node)
+static inline CDS_WFQ_DEPRECATED
+void cds_wfq_enqueue(struct cds_wfq_queue *q, struct cds_wfq_node *node)
{
- struct wfq_node **old_tail;
-
- /*
- * uatomic_xchg() implicit memory barrier orders earlier stores to data
- * structure containing node and setting node->next to NULL before
- * publication.
- */
- old_tail = uatomic_xchg(&q->tail, node);
- /*
- * At this point, dequeuers see a NULL old_tail->next, which indicates
- * that the queue is being appended to. The following store will append
- * "node" to the queue from a dequeuer perspective.
- */
- STORE_SHARED(*old_tail, node);
+ _cds_wfq_enqueue(q, node);
}
-/*
- * It is valid to reuse and free a dequeued node immediately.
- *
- * No need to go on a waitqueue here, as there is no possible state in which the
- * list could cause dequeue to busy-loop needlessly while waiting for another
- * thread to be scheduled. The queue appears empty until tail->next is set by
- * enqueue.
- */
-struct wfq_node *
-__wfq_dequeue_blocking(struct wfq_queue *q)
+static inline CDS_WFQ_DEPRECATED
+struct cds_wfq_node *__cds_wfq_dequeue_blocking(struct cds_wfq_queue *q)
{
- struct wfq_node *node, *next;
- int busy_wait = 16;
-
- /*
- * Queue is empty if it only contains the dummy node.
- */
- if (q->head == &q->dummy && LOAD_SHARED(q->tail) == &q->dummy.next)
- return NULL;
- node = q->head;
-
- /*
- * Adaptative busy-looping waiting for enqueuer to complete enqueue.
- */
- while ((next = LOAD_SHARED(node->next)) == NULL) {
- if (busy_wait > 0) {
- cpu_relax();
- busy_wait--;
- } else
- poll(NULL, 0, 1); /* Wait for 1ms */
- }
- /*
- * Move queue head forward.
- */
- q->head = next;
- /*
- * Requeue dummy node if we just dequeued it.
- */
- if (node == &q->dummy) {
- wfq_node_init(node);
- wfq_enqueue(q, node);
- return __wfq_dequeue_blocking(q);
- }
- return node;
+ return ___cds_wfq_dequeue_blocking(q);
}
-struct wfq_node *
-wfq_dequeue_blocking(struct wfq_queue *q)
+static inline CDS_WFQ_DEPRECATED
+struct cds_wfq_node *cds_wfq_dequeue_blocking(struct cds_wfq_queue *q)
{
- struct wfq_node *retnode;
- int ret;
-
- ret = pthread_mutex_lock(&q->lock);
- assert(!ret);
- retnode = __wfq_dequeue_blocking(q);
- ret = pthread_mutex_unlock(&q->lock);
- assert(!ret);
- return retnode;
+ 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_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