CDS_WFCQ_RET_SRC_EMPTY = 2,
};
+enum cds_wfcq_state {
+ CDS_WFCQ_STATE_LAST = (1U << 0),
+};
+
struct cds_wfcq_node {
struct cds_wfcq_node *next;
};
/* Locking performed within cds_wfcq calls. */
#define cds_wfcq_dequeue_blocking _cds_wfcq_dequeue_blocking
+#define cds_wfcq_dequeue_with_state_blocking \
+ _cds_wfcq_dequeue_with_state_blocking
#define cds_wfcq_splice_blocking _cds_wfcq_splice_blocking
#define cds_wfcq_first_blocking _cds_wfcq_first_blocking
#define cds_wfcq_next_blocking _cds_wfcq_next_blocking
/* Locking ensured by caller by holding cds_wfcq_dequeue_lock() */
#define __cds_wfcq_dequeue_blocking ___cds_wfcq_dequeue_blocking
+#define __cds_wfcq_dequeue_with_state_blocking \
+ ___cds_wfcq_dequeue_with_state_blocking
#define __cds_wfcq_splice_blocking ___cds_wfcq_splice_blocking
#define __cds_wfcq_first_blocking ___cds_wfcq_first_blocking
#define __cds_wfcq_next_blocking ___cds_wfcq_next_blocking
* need to block. splice returns nonzero if it needs to block.
*/
#define __cds_wfcq_dequeue_nonblocking ___cds_wfcq_dequeue_nonblocking
+#define __cds_wfcq_dequeue_with_state_nonblocking \
+ ___cds_wfcq_dequeue_with_state_nonblocking
#define __cds_wfcq_splice_nonblocking ___cds_wfcq_splice_nonblocking
#define __cds_wfcq_first_nonblocking ___cds_wfcq_first_nonblocking
#define __cds_wfcq_next_nonblocking ___cds_wfcq_next_nonblocking
* Content written into the node before enqueue is guaranteed to be
* consistent, but no other memory ordering is ensured.
* It is valid to reuse and free a dequeued node immediately.
- * Mutual exlusion with cds_wfcq_dequeue_blocking and dequeue lock is
+ * Mutual exclusion with cds_wfcq_dequeue_blocking and dequeue lock is
* ensured.
*/
extern struct cds_wfcq_node *cds_wfcq_dequeue_blocking(
struct cds_wfcq_head *head,
struct cds_wfcq_tail *tail);
+/*
+ * cds_wfcq_dequeue_with_state_blocking: dequeue with state.
+ *
+ * Same as cds_wfcq_dequeue_blocking, but saves whether dequeueing the
+ * last node of the queue into state (CDS_WFCQ_STATE_LAST).
+ */
+extern struct cds_wfcq_node *cds_wfcq_dequeue_with_state_blocking(
+ struct cds_wfcq_head *head,
+ struct cds_wfcq_tail *tail,
+ int *state);
+
/*
* cds_wfcq_splice_blocking: enqueue all src_q nodes at the end of dest_q.
*
* dest_q must be already initialized.
* Content written into the node before enqueue is guaranteed to be
* consistent, but no other memory ordering is ensured.
- * Mutual exlusion with cds_wfcq_dequeue_blocking and dequeue lock is
+ * Mutual exclusion with cds_wfcq_dequeue_blocking and dequeue lock is
* ensured.
*
* Returns enum cds_wfcq_ret which indicates the state of the src or
- * dest queue. Cannot block.
+ * dest queue.
*/
extern enum cds_wfcq_ret cds_wfcq_splice_blocking(
struct cds_wfcq_head *dest_q_head,
struct cds_wfcq_head *head,
struct cds_wfcq_tail *tail);
+/*
+ * __cds_wfcq_dequeue_with_state_blocking: dequeue with state.
+ *
+ * Same as __cds_wfcq_dequeue_blocking, but saves whether dequeueing the
+ * last node of the queue into state (CDS_WFCQ_STATE_LAST).
+ */
+extern struct cds_wfcq_node *__cds_wfcq_dequeue_with_state_blocking(
+ struct cds_wfcq_head *head,
+ struct cds_wfcq_tail *tail,
+ int *state);
+
/*
* __cds_wfcq_dequeue_nonblocking: dequeue a node from a wait-free queue.
*
struct cds_wfcq_head *head,
struct cds_wfcq_tail *tail);
+/*
+ * __cds_wfcq_dequeue_with_state_blocking: dequeue with state.
+ *
+ * Same as __cds_wfcq_dequeue_nonblocking, but saves whether dequeueing
+ * the last node of the queue into state (CDS_WFCQ_STATE_LAST).
+ */
+extern struct cds_wfcq_node *__cds_wfcq_dequeue_with_state_nonblocking(
+ struct cds_wfcq_head *head,
+ struct cds_wfcq_tail *tail,
+ int *state);
+
/*
* __cds_wfcq_splice_blocking: enqueue all src_q nodes at the end of dest_q.
*