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wfcqueue: clarify locking usage
[urcu.git]
/
urcu
/
static
/
wfcqueue.h
diff --git
a/urcu/static/wfcqueue.h
b/urcu/static/wfcqueue.h
index 2c8c447fd591f46fa213bb6573c79d2a8293316f..2ca9eebe649d9436f7584c1f898e0d29524207b9 100644
(file)
--- a/
urcu/static/wfcqueue.h
+++ b/
urcu/static/wfcqueue.h
@@
-59,6
+59,10
@@
extern "C" {
*
* For convenience, cds_wfcq_dequeue_blocking() and
* cds_wfcq_splice_blocking() hold the dequeue lock.
*
* For convenience, cds_wfcq_dequeue_blocking() and
* cds_wfcq_splice_blocking() hold the dequeue lock.
+ *
+ * Besides locking, mutual exclusion of dequeue, splice and iteration
+ * can be ensured by performing all of those operations from a single
+ * thread, without requiring any lock.
*/
#define WFCQ_ADAPT_ATTEMPTS 10 /* Retry if being set */
*/
#define WFCQ_ADAPT_ATTEMPTS 10 /* Retry if being set */
@@
-192,7
+196,8
@@
___cds_wfcq_node_sync_next(struct cds_wfcq_node *node)
*
* Content written into the node before enqueue is guaranteed to be
* consistent, but no other memory ordering is ensured.
*
* Content written into the node before enqueue is guaranteed to be
* consistent, but no other memory ordering is ensured.
- * Should be called with cds_wfcq_dequeue_lock() held.
+ * Dequeue/splice/iteration mutual exclusion should be ensured by the
+ * caller.
*
* Used by for-like iteration macros in urcu/wfqueue.h:
* __cds_wfcq_for_each_blocking()
*
* Used by for-like iteration macros in urcu/wfqueue.h:
* __cds_wfcq_for_each_blocking()
@@
-217,7
+222,8
@@
___cds_wfcq_first_blocking(struct cds_wfcq_head *head,
*
* Content written into the node before enqueue is guaranteed to be
* consistent, but no other memory ordering is ensured.
*
* Content written into the node before enqueue is guaranteed to be
* consistent, but no other memory ordering is ensured.
- * Should be called with cds_wfcq_dequeue_lock() held.
+ * Dequeue/splice/iteration mutual exclusion should be ensured by the
+ * caller.
*
* Used by for-like iteration macros in urcu/wfqueue.h:
* __cds_wfcq_for_each_blocking()
*
* Used by for-like iteration macros in urcu/wfqueue.h:
* __cds_wfcq_for_each_blocking()
@@
-259,7
+265,8
@@
___cds_wfcq_next_blocking(struct cds_wfcq_head *head,
* 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.
* 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.
- * Should be called with cds_wfcq_dequeue_lock() held.
+ * Dequeue/splice/iteration mutual exclusion should be ensured by the
+ * caller.
*/
static inline struct cds_wfcq_node *
___cds_wfcq_dequeue_blocking(struct cds_wfcq_head *head,
*/
static inline struct cds_wfcq_node *
___cds_wfcq_dequeue_blocking(struct cds_wfcq_head *head,
@@
-308,7
+315,8
@@
___cds_wfcq_dequeue_blocking(struct cds_wfcq_head *head,
*
* Dequeue all nodes from src_q.
* dest_q must be already initialized.
*
* Dequeue all nodes from src_q.
* dest_q must be already initialized.
- * Should be called with cds_wfcq_dequeue_lock() held on src_q.
+ * Dequeue/splice/iteration mutual exclusion for src_q should be ensured
+ * by the caller.
*/
static inline void
___cds_wfcq_splice_blocking(
*/
static inline void
___cds_wfcq_splice_blocking(
@@
-345,7
+353,7
@@
___cds_wfcq_splice_blocking(
*
* Content written into the node before enqueue is guaranteed to be
* consistent, but no other memory ordering is ensured.
*
* Content written into the node before enqueue is guaranteed to be
* consistent, but no other memory ordering is ensured.
- * Mutual exlusion with
(and only with) cds_wfcq_splice_blocking
is
+ * Mutual exlusion with
cds_wfcq_splice_blocking and dequeue lock
is
* ensured.
* It is valid to reuse and free a dequeued node immediately.
*/
* ensured.
* It is valid to reuse and free a dequeued node immediately.
*/
@@
-368,7
+376,7
@@
_cds_wfcq_dequeue_blocking(struct cds_wfcq_head *head,
* 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.
* 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
(and only with) cds_wfcq_dequeue_blocking
is
+ * Mutual exlusion with
cds_wfcq_dequeue_blocking and dequeue lock
is
* ensured.
*/
static inline void
* ensured.
*/
static inline void
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