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rcu_queue: add RCU QSIMPLEQ

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Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <20180819091335.22863-4-cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Emilio G. Cota 2018-08-19 05:13:27 -04:00 committed by Paolo Bonzini
parent 735d1af662
commit 13d8ef7dda
1 changed files with 65 additions and 0 deletions
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65
include/qemu/rcu_queue.h
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@ -128,6 +128,71 @@ extern "C" {
((next_var) = atomic_rcu_read(&(var)->field.le_next), 1); \
(var) = (next_var))
/*
* RCU simple queue
*/
/* Simple queue access methods */
#define QSIMPLEQ_EMPTY_RCU(head) (atomic_read(&(head)->sqh_first) == NULL)
#define QSIMPLEQ_FIRST_RCU(head) atomic_rcu_read(&(head)->sqh_first)
#define QSIMPLEQ_NEXT_RCU(elm, field) atomic_rcu_read(&(elm)->field.sqe_next)
/* Simple queue functions */
#define QSIMPLEQ_INSERT_HEAD_RCU(head, elm, field) do { \
(elm)->field.sqe_next = (head)->sqh_first; \
if ((elm)->field.sqe_next == NULL) { \
(head)->sqh_last = &(elm)->field.sqe_next; \
} \
atomic_rcu_set(&(head)->sqh_first, (elm)); \
} while (/*CONSTCOND*/0)
#define QSIMPLEQ_INSERT_TAIL_RCU(head, elm, field) do { \
(elm)->field.sqe_next = NULL; \
atomic_rcu_set((head)->sqh_last, (elm)); \
(head)->sqh_last = &(elm)->field.sqe_next; \
} while (/*CONSTCOND*/0)
#define QSIMPLEQ_INSERT_AFTER_RCU(head, listelm, elm, field) do { \
(elm)->field.sqe_next = (listelm)->field.sqe_next; \
if ((elm)->field.sqe_next == NULL) { \
(head)->sqh_last = &(elm)->field.sqe_next; \
} \
atomic_rcu_set(&(listelm)->field.sqe_next, (elm)); \
} while (/*CONSTCOND*/0)
#define QSIMPLEQ_REMOVE_HEAD_RCU(head, field) do { \
atomic_set(&(head)->sqh_first, (head)->sqh_first->field.sqe_next); \
if ((head)->sqh_first == NULL) { \
(head)->sqh_last = &(head)->sqh_first; \
} \
} while (/*CONSTCOND*/0)
#define QSIMPLEQ_REMOVE_RCU(head, elm, type, field) do { \
if ((head)->sqh_first == (elm)) { \
QSIMPLEQ_REMOVE_HEAD_RCU((head), field); \
} else { \
struct type *curr = (head)->sqh_first; \
while (curr->field.sqe_next != (elm)) { \
curr = curr->field.sqe_next; \
} \
atomic_set(&curr->field.sqe_next, \
curr->field.sqe_next->field.sqe_next); \
if (curr->field.sqe_next == NULL) { \
(head)->sqh_last = &(curr)->field.sqe_next; \
} \
} \
} while (/*CONSTCOND*/0)
#define QSIMPLEQ_FOREACH_RCU(var, head, field) \
for ((var) = atomic_rcu_read(&(head)->sqh_first); \
(var); \
(var) = atomic_rcu_read(&(var)->field.sqe_next))
#define QSIMPLEQ_FOREACH_SAFE_RCU(var, head, field, next) \
for ((var) = atomic_rcu_read(&(head)->sqh_first); \
(var) && ((next) = atomic_rcu_read(&(var)->field.sqe_next), 1); \
(var) = (next))
#ifdef __cplusplus
}
#endif