* Stack implementing push, pop, pop_all operations, as well as iterator
* on the stack head returned by pop_all.
*
- * Wait-free operations: cds_wfs_push, __cds_wfs_pop_all.
- * Blocking operations: cds_wfs_pop, cds_wfs_pop_all, iteration on stack
- * head returned by pop_all.
+ * Wait-free operations: cds_wfs_push, __cds_wfs_pop_all, cds_wfs_empty,
+ * cds_wfs_first.
+ * Blocking operations: cds_wfs_pop, cds_wfs_pop_all, cds_wfs_next,
+ * iteration on stack head returned by pop_all.
*
* Synchronization table:
*
* synchronization.
*/
+#define CDS_WFS_WOULDBLOCK ((void *) -1UL)
+
+enum cds_wfs_state {
+ CDS_WFS_STATE_LAST = (1U << 0),
+};
+
/*
* struct cds_wfs_node is returned by __cds_wfs_pop, and also used as
* iterator on stack. It is not safe to dereference the node next
/* Locking performed internally */
#define cds_wfs_pop_blocking _cds_wfs_pop_blocking
+#define cds_wfs_pop_with_state_blocking _cds_wfs_pop_with_state_blocking
#define cds_wfs_pop_all_blocking _cds_wfs_pop_all_blocking
/*
*/
#define cds_wfs_first _cds_wfs_first
#define cds_wfs_next_blocking _cds_wfs_next_blocking
+#define cds_wfs_next_nonblocking _cds_wfs_next_nonblocking
/* Pop locking with internal mutex */
#define cds_wfs_pop_lock _cds_wfs_pop_lock
/* Synchronization ensured by the caller. See synchronization table. */
#define __cds_wfs_pop_blocking ___cds_wfs_pop_blocking
+#define __cds_wfs_pop_with_state_blocking \
+ ___cds_wfs_pop_with_state_blocking
+#define __cds_wfs_pop_nonblocking ___cds_wfs_pop_nonblocking
+#define __cds_wfs_pop_with_state_nonblocking \
+ ___cds_wfs_pop_with_state_nonblocking
#define __cds_wfs_pop_all ___cds_wfs_pop_all
#else /* !_LGPL_SOURCE */
*/
extern struct cds_wfs_node *cds_wfs_pop_blocking(struct cds_wfs_stack *s);
+/*
+ * cds_wfs_pop_with_state_blocking: pop a node from the stack, with state.
+ *
+ * Same as cds_wfs_pop_blocking, but stores whether the stack was
+ * empty into state (CDS_WFS_STATE_LAST).
+ */
+extern struct cds_wfs_node *
+ cds_wfs_pop_with_state_blocking(struct cds_wfs_stack *s, int *state);
+
/*
* cds_wfs_pop_all_blocking: pop all nodes from a stack.
*
*/
extern struct cds_wfs_node *cds_wfs_next_blocking(struct cds_wfs_node *node);
+/*
+ * cds_wfs_next_nonblocking: get next node of a popped stack.
+ *
+ * Same as cds_wfs_next_blocking, but returns CDS_WFS_WOULDBLOCK if it
+ * needs to block.
+ */
+extern struct cds_wfs_node *cds_wfs_next_nonblocking(struct cds_wfs_node *node);
+
/*
* cds_wfs_pop_lock: lock stack pop-protection mutex.
*/
*/
extern struct cds_wfs_node *__cds_wfs_pop_blocking(struct cds_wfs_stack *s);
+/*
+ * __cds_wfs_pop_with_state_blocking: pop a node from the stack, with state.
+ *
+ * Same as __cds_wfs_pop_blocking, but stores whether the stack was
+ * empty into state (CDS_WFS_STATE_LAST).
+ */
+extern struct cds_wfs_node *
+ __cds_wfs_pop_with_state_blocking(struct cds_wfs_stack *s, int *state);
+
+/*
+ * __cds_wfs_pop_nonblocking: pop a node from the stack.
+ *
+ * Same as __cds_wfs_pop_blocking, but returns CDS_WFS_WOULDBLOCK if
+ * it needs to block.
+ */
+extern struct cds_wfs_node *__cds_wfs_pop_nonblocking(struct cds_wfs_stack *s);
+
+/*
+ * __cds_wfs_pop_with_state_nonblocking: pop a node from the stack, with state.
+ *
+ * Same as __cds_wfs_pop_nonblocking, but stores whether the stack was
+ * empty into state (CDS_WFS_STATE_LAST).
+ */
+extern struct cds_wfs_node *
+ __cds_wfs_pop_with_state_nonblocking(struct cds_wfs_stack *s,
+ int *state);
+
/*
* __cds_wfs_pop_all: pop all nodes from a stack.
*