assert(!ret);
}
+/*
+ * __cds_wfcq_init: initialize wait-free queue.
+ */
+static inline void ___cds_wfcq_init(struct __cds_wfcq_head *head,
+ struct cds_wfcq_tail *tail)
+{
+ /* Set queue head and tail */
+ _cds_wfcq_node_init(&head->node);
+ tail->p = &head->node;
+}
+
/*
* cds_wfcq_empty: return whether wait-free queue is empty.
*
* make a queue appear empty if an enqueuer is preempted for a long time
* between xchg() and setting the previous node's next pointer.
*/
-static inline bool _cds_wfcq_empty(struct cds_wfcq_head *head,
+static inline bool _cds_wfcq_empty(cds_wfcq_head_ptr_t u_head,
struct cds_wfcq_tail *tail)
{
+ struct __cds_wfcq_head *head = u_head._h;
/*
* Queue is empty if no node is pointed by head->node.next nor
* tail->p. Even though the tail->p check is sufficient to find
assert(!ret);
}
-static inline bool ___cds_wfcq_append(struct cds_wfcq_head *head,
+static inline bool ___cds_wfcq_append(cds_wfcq_head_ptr_t u_head,
struct cds_wfcq_tail *tail,
struct cds_wfcq_node *new_head,
struct cds_wfcq_node *new_tail)
{
+ struct __cds_wfcq_head *head = u_head._h;
struct cds_wfcq_node *old_tail;
/*
* Returns false if the queue was empty prior to adding the node.
* Returns true otherwise.
*/
-static inline bool _cds_wfcq_enqueue(struct cds_wfcq_head *head,
+static inline bool _cds_wfcq_enqueue(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
struct cds_wfcq_node *new_tail)
{
}
static inline struct cds_wfcq_node *
-___cds_wfcq_first(struct cds_wfcq_head *head,
+___cds_wfcq_first(cds_wfcq_head_ptr_t u_head,
struct cds_wfcq_tail *tail,
int blocking)
{
+ struct __cds_wfcq_head *head = u_head._h;
struct cds_wfcq_node *node;
if (_cds_wfcq_empty(head, tail))
* Returns NULL if queue is empty, first node otherwise.
*/
static inline struct cds_wfcq_node *
-___cds_wfcq_first_blocking(struct cds_wfcq_head *head,
+___cds_wfcq_first_blocking(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail)
{
return ___cds_wfcq_first(head, tail, 1);
* it needs to block.
*/
static inline struct cds_wfcq_node *
-___cds_wfcq_first_nonblocking(struct cds_wfcq_head *head,
+___cds_wfcq_first_nonblocking(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail)
{
return ___cds_wfcq_first(head, tail, 0);
}
static inline struct cds_wfcq_node *
-___cds_wfcq_next(struct cds_wfcq_head *head,
+___cds_wfcq_next(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
struct cds_wfcq_node *node,
int blocking)
* otherwise.
*/
static inline struct cds_wfcq_node *
-___cds_wfcq_next_blocking(struct cds_wfcq_head *head,
+___cds_wfcq_next_blocking(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
struct cds_wfcq_node *node)
{
* it needs to block.
*/
static inline struct cds_wfcq_node *
-___cds_wfcq_next_nonblocking(struct cds_wfcq_head *head,
+___cds_wfcq_next_nonblocking(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
struct cds_wfcq_node *node)
{
}
static inline struct cds_wfcq_node *
-___cds_wfcq_dequeue_with_state(struct cds_wfcq_head *head,
+___cds_wfcq_dequeue_with_state(cds_wfcq_head_ptr_t u_head,
struct cds_wfcq_tail *tail,
int *state,
int blocking)
{
+ struct __cds_wfcq_head *head = u_head._h;
struct cds_wfcq_node *node, *next;
if (state)
* caller.
*/
static inline struct cds_wfcq_node *
-___cds_wfcq_dequeue_with_state_blocking(struct cds_wfcq_head *head,
+___cds_wfcq_dequeue_with_state_blocking(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail, int *state)
{
return ___cds_wfcq_dequeue_with_state(head, tail, state, 1);
* state.
*/
static inline struct cds_wfcq_node *
-___cds_wfcq_dequeue_blocking(struct cds_wfcq_head *head,
+___cds_wfcq_dequeue_blocking(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail)
{
return ___cds_wfcq_dequeue_with_state_blocking(head, tail, NULL);
* if it needs to block.
*/
static inline struct cds_wfcq_node *
-___cds_wfcq_dequeue_with_state_nonblocking(struct cds_wfcq_head *head,
+___cds_wfcq_dequeue_with_state_nonblocking(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail, int *state)
{
return ___cds_wfcq_dequeue_with_state(head, tail, state, 0);
* state.
*/
static inline struct cds_wfcq_node *
-___cds_wfcq_dequeue_nonblocking(struct cds_wfcq_head *head,
+___cds_wfcq_dequeue_nonblocking(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail)
{
return ___cds_wfcq_dequeue_with_state_nonblocking(head, tail, NULL);
*/
static inline enum cds_wfcq_ret
___cds_wfcq_splice(
- struct cds_wfcq_head *dest_q_head,
+ cds_wfcq_head_ptr_t u_dest_q_head,
struct cds_wfcq_tail *dest_q_tail,
- struct cds_wfcq_head *src_q_head,
+ cds_wfcq_head_ptr_t u_src_q_head,
struct cds_wfcq_tail *src_q_tail,
int blocking)
{
+ struct __cds_wfcq_head *dest_q_head = u_dest_q_head._h;
+ struct __cds_wfcq_head *src_q_head = u_src_q_head._h;
struct cds_wfcq_node *head, *tail;
int attempt = 0;
*/
static inline enum cds_wfcq_ret
___cds_wfcq_splice_blocking(
- struct cds_wfcq_head *dest_q_head,
+ cds_wfcq_head_ptr_t dest_q_head,
struct cds_wfcq_tail *dest_q_tail,
- struct cds_wfcq_head *src_q_head,
+ cds_wfcq_head_ptr_t src_q_head,
struct cds_wfcq_tail *src_q_tail)
{
return ___cds_wfcq_splice(dest_q_head, dest_q_tail,
*/
static inline enum cds_wfcq_ret
___cds_wfcq_splice_nonblocking(
- struct cds_wfcq_head *dest_q_head,
+ cds_wfcq_head_ptr_t dest_q_head,
struct cds_wfcq_tail *dest_q_tail,
- struct cds_wfcq_head *src_q_head,
+ cds_wfcq_head_ptr_t src_q_head,
struct cds_wfcq_tail *src_q_tail)
{
return ___cds_wfcq_splice(dest_q_head, dest_q_tail,
* enqueue/dequeue are expected from many CPUs. This eliminates
* false-sharing between enqueue and dequeue.
*/
+struct __cds_wfcq_head {
+ struct cds_wfcq_node node;
+};
+
struct cds_wfcq_head {
struct cds_wfcq_node node;
pthread_mutex_t lock;
};
+/*
+ * The transparent union allows calling functions that work on both
+ * struct cds_wfcq_head and struct __cds_wfcq_head on any of those two
+ * types.
+ */
+typedef union __attribute__((__transparent_union__)) {
+ struct __cds_wfcq_head *_h;
+ struct cds_wfcq_head *h;
+} cds_wfcq_head_ptr_t;
+
struct cds_wfcq_tail {
struct cds_wfcq_node *p;
};
extern void cds_wfcq_init(struct cds_wfcq_head *head,
struct cds_wfcq_tail *tail);
+/*
+ * __cds_wfcq_init: initialize wait-free queue.
+ */
+extern void __cds_wfcq_init(struct __cds_wfcq_head *head,
+ struct cds_wfcq_tail *tail);
+
/*
* cds_wfcq_empty: return whether wait-free queue is empty.
*
* No memory barrier is issued. No mutual exclusion is required.
*/
-extern bool cds_wfcq_empty(struct cds_wfcq_head *head,
+extern bool cds_wfcq_empty(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail);
/*
* Returns false if the queue was empty prior to adding the node.
* Returns true otherwise.
*/
-extern bool cds_wfcq_enqueue(struct cds_wfcq_head *head,
+extern bool cds_wfcq_enqueue(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
struct cds_wfcq_node *node);
* caller.
*/
extern struct cds_wfcq_node *__cds_wfcq_dequeue_blocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail);
/*
* 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,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
int *state);
* if it needs to block.
*/
extern struct cds_wfcq_node *__cds_wfcq_dequeue_nonblocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail);
/*
* 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,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
int *state);
* dest queue. Never returns CDS_WFCQ_RET_WOULDBLOCK.
*/
extern enum cds_wfcq_ret __cds_wfcq_splice_blocking(
- struct cds_wfcq_head *dest_q_head,
+ cds_wfcq_head_ptr_t dest_q_head,
struct cds_wfcq_tail *dest_q_tail,
- struct cds_wfcq_head *src_q_head,
+ cds_wfcq_head_ptr_t src_q_head,
struct cds_wfcq_tail *src_q_tail);
/*
* CDS_WFCQ_RET_WOULDBLOCK if it needs to block.
*/
extern enum cds_wfcq_ret __cds_wfcq_splice_nonblocking(
- struct cds_wfcq_head *dest_q_head,
+ cds_wfcq_head_ptr_t dest_q_head,
struct cds_wfcq_tail *dest_q_tail,
- struct cds_wfcq_head *src_q_head,
+ cds_wfcq_head_ptr_t src_q_head,
struct cds_wfcq_tail *src_q_tail);
/*
* Returns NULL if queue is empty, first node otherwise.
*/
extern struct cds_wfcq_node *__cds_wfcq_first_blocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail);
/*
* it needs to block.
*/
extern struct cds_wfcq_node *__cds_wfcq_first_nonblocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail);
/*
* otherwise.
*/
extern struct cds_wfcq_node *__cds_wfcq_next_blocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
struct cds_wfcq_node *node);
* it needs to block.
*/
extern struct cds_wfcq_node *__cds_wfcq_next_nonblocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
struct cds_wfcq_node *node);
/*
* __cds_wfcq_for_each_blocking: Iterate over all nodes in a queue,
* without dequeuing them.
- * @head: head of the queue (struct cds_wfcq_head pointer).
+ * @head: head of the queue (struct cds_wfcq_head or __cds_wfcq_head pointer).
* @tail: tail of the queue (struct cds_wfcq_tail pointer).
* @node: iterator on the queue (struct cds_wfcq_node pointer).
*
/*
* __cds_wfcq_for_each_blocking_safe: Iterate over all nodes in a queue,
* without dequeuing them. Safe against deletion.
- * @head: head of the queue (struct cds_wfcq_head pointer).
+ * @head: head of the queue (struct cds_wfcq_head or __cds_wfcq_head pointer).
* @tail: tail of the queue (struct cds_wfcq_tail pointer).
* @node: iterator on the queue (struct cds_wfcq_node pointer).
* @n: struct cds_wfcq_node pointer holding the next pointer (used
_cds_wfcq_init(head, tail);
}
-bool cds_wfcq_empty(struct cds_wfcq_head *head,
+void __cds_wfcq_init(struct __cds_wfcq_head *head,
+ struct cds_wfcq_tail *tail)
+{
+ ___cds_wfcq_init(head, tail);
+}
+
+bool cds_wfcq_empty(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail)
{
return _cds_wfcq_empty(head, tail);
}
-bool cds_wfcq_enqueue(struct cds_wfcq_head *head,
+bool cds_wfcq_enqueue(cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
struct cds_wfcq_node *node)
{
}
struct cds_wfcq_node *__cds_wfcq_dequeue_blocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail)
{
return ___cds_wfcq_dequeue_blocking(head, tail);
}
struct cds_wfcq_node *__cds_wfcq_dequeue_with_state_blocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
int *state)
{
}
struct cds_wfcq_node *__cds_wfcq_dequeue_nonblocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail)
{
return ___cds_wfcq_dequeue_nonblocking(head, tail);
}
struct cds_wfcq_node *__cds_wfcq_dequeue_with_state_nonblocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
int *state)
{
}
enum cds_wfcq_ret __cds_wfcq_splice_blocking(
- struct cds_wfcq_head *dest_q_head,
+ cds_wfcq_head_ptr_t dest_q_head,
struct cds_wfcq_tail *dest_q_tail,
- struct cds_wfcq_head *src_q_head,
+ cds_wfcq_head_ptr_t src_q_head,
struct cds_wfcq_tail *src_q_tail)
{
return ___cds_wfcq_splice_blocking(dest_q_head, dest_q_tail,
}
enum cds_wfcq_ret __cds_wfcq_splice_nonblocking(
- struct cds_wfcq_head *dest_q_head,
+ cds_wfcq_head_ptr_t dest_q_head,
struct cds_wfcq_tail *dest_q_tail,
- struct cds_wfcq_head *src_q_head,
+ cds_wfcq_head_ptr_t src_q_head,
struct cds_wfcq_tail *src_q_tail)
{
return ___cds_wfcq_splice_nonblocking(dest_q_head, dest_q_tail,
}
struct cds_wfcq_node *__cds_wfcq_first_blocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail)
{
return ___cds_wfcq_first_blocking(head, tail);
}
struct cds_wfcq_node *__cds_wfcq_first_nonblocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail)
{
return ___cds_wfcq_first_nonblocking(head, tail);
}
struct cds_wfcq_node *__cds_wfcq_next_blocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
struct cds_wfcq_node *node)
{
}
struct cds_wfcq_node *__cds_wfcq_next_nonblocking(
- struct cds_wfcq_head *head,
+ cds_wfcq_head_ptr_t head,
struct cds_wfcq_tail *tail,
struct cds_wfcq_node *node)
{
projects / userspace-rcu.git / commitdiff
