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[Qemu-devel] [PATCH v2 04/11] rcu_queue: add RCU QTAILQ
From: |
Emilio G. Cota |
Subject: |
[Qemu-devel] [PATCH v2 04/11] rcu_queue: add RCU QTAILQ |
Date: |
Sun, 19 Aug 2018 05:13:28 -0400 |
Signed-off-by: Emilio G. Cota <address@hidden>
---
include/qemu/rcu_queue.h | 66 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 66 insertions(+)
diff --git a/include/qemu/rcu_queue.h b/include/qemu/rcu_queue.h
index e0395c989a..904b3372dc 100644
--- a/include/qemu/rcu_queue.h
+++ b/include/qemu/rcu_queue.h
@@ -193,6 +193,72 @@ extern "C" {
(var) && ((next) = atomic_rcu_read(&(var)->field.sqe_next), 1); \
(var) = (next))
+/*
+ * RCU tail queue
+ */
+
+/* Tail queue access methods */
+#define QTAILQ_EMPTY_RCU(head) (atomic_read(&(head)->tqh_first) == NULL)
+#define QTAILQ_FIRST_RCU(head) atomic_rcu_read(&(head)->tqh_first)
+#define QTAILQ_NEXT_RCU(elm, field) atomic_rcu_read(&(elm)->field.tqe_next)
+
+/* Tail queue functions */
+#define QTAILQ_INSERT_HEAD_RCU(head, elm, field) do { \
+ (elm)->field.tqe_next = (head)->tqh_first; \
+ if ((elm)->field.tqe_next != NULL) { \
+ (head)->tqh_first->field.tqe_prev = &(elm)->field.tqe_next; \
+ } else { \
+ (head)->tqh_last = &(elm)->field.tqe_next; \
+ } \
+ atomic_rcu_set(&(head)->tqh_first, (elm)); \
+ (elm)->field.tqe_prev = &(head)->tqh_first; \
+} while (/*CONSTCOND*/0)
+
+#define QTAILQ_INSERT_TAIL_RCU(head, elm, field) do { \
+ (elm)->field.tqe_next = NULL; \
+ (elm)->field.tqe_prev = (head)->tqh_last; \
+ atomic_rcu_set((head)->tqh_last, (elm)); \
+ (head)->tqh_last = &(elm)->field.tqe_next; \
+} while (/*CONSTCOND*/0)
+
+#define QTAILQ_INSERT_AFTER_RCU(head, listelm, elm, field) do { \
+ (elm)->field.tqe_next = (listelm)->field.tqe_next; \
+ if ((elm)->field.tqe_next != NULL) { \
+ (elm)->field.tqe_next->field.tqe_prev = &(elm)->field.tqe_next; \
+ } else { \
+ (head)->tqh_last = &(elm)->field.tqe_next; \
+ } \
+ atomic_rcu_set(&(listelm)->field.tqe_next, (elm)); \
+ (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
+} while (/*CONSTCOND*/0)
+
+#define QTAILQ_INSERT_BEFORE_RCU(listelm, elm, field) do { \
+ (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
+ (elm)->field.tqe_next = (listelm); \
+ atomic_rcu_set((listelm)->field.tqe_prev, (elm)); \
+ (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \
+ } while (/*CONSTCOND*/0)
+
+#define QTAILQ_REMOVE_RCU(head, elm, field) do { \
+ if (((elm)->field.tqe_next) != NULL) { \
+ (elm)->field.tqe_next->field.tqe_prev = (elm)->field.tqe_prev; \
+ } else { \
+ (head)->tqh_last = (elm)->field.tqe_prev; \
+ } \
+ atomic_set((elm)->field.tqe_prev, (elm)->field.tqe_next); \
+ (elm)->field.tqe_prev = NULL; \
+} while (/*CONSTCOND*/0)
+
+#define QTAILQ_FOREACH_RCU(var, head, field) \
+ for ((var) = atomic_rcu_read(&(head)->tqh_first); \
+ (var); \
+ (var) = atomic_rcu_read(&(var)->field.tqe_next))
+
+#define QTAILQ_FOREACH_SAFE_RCU(var, head, field, next) \
+ for ((var) = atomic_rcu_read(&(head)->tqh_first); \
+ (var) && ((next) = atomic_rcu_read(&(var)->field.tqe_next), 1); \
+ (var) = (next))
+
#ifdef __cplusplus
}
#endif
--
2.17.1
- [Qemu-devel] [PATCH v2 00/11] convert CPU list to RCU, Emilio G. Cota, 2018/08/19
- [Qemu-devel] [PATCH v2 02/11] rcu_queue: remove barrier from QLIST_EMPTY_RCU, Emilio G. Cota, 2018/08/19
- [Qemu-devel] [PATCH v2 07/11] test-rcu-list: abstract the list implementation, Emilio G. Cota, 2018/08/19
- [Qemu-devel] [PATCH v2 01/11] rcu_queue: use atomic_set in QLIST_REMOVE_RCU, Emilio G. Cota, 2018/08/19
- [Qemu-devel] [PATCH v2 10/11] spapr: do not use CPU_FOREACH_REVERSE, Emilio G. Cota, 2018/08/19
- [Qemu-devel] [PATCH v2 03/11] rcu_queue: add RCU QSIMPLEQ, Emilio G. Cota, 2018/08/19
- [Qemu-devel] [PATCH v2 11/11] qom: convert the CPU list to RCU, Emilio G. Cota, 2018/08/19
- [Qemu-devel] [PATCH v2 06/11] test-rcu-list: access counters with atomics, Emilio G. Cota, 2018/08/19
- [Qemu-devel] [PATCH v2 04/11] rcu_queue: add RCU QTAILQ,
Emilio G. Cota <=
- [Qemu-devel] [PATCH v2 09/11] tests: add test-rcu-tailq, Emilio G. Cota, 2018/08/19
- [Qemu-devel] [PATCH v2 08/11] tests: add test-list-simpleq, Emilio G. Cota, 2018/08/19
- [Qemu-devel] [PATCH v2 05/11] test-rcu-list: access goflag with atomics, Emilio G. Cota, 2018/08/19
- Re: [Qemu-devel] [PATCH v2 00/11] convert CPU list to RCU, Paolo Bonzini, 2018/08/20