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queue: add QTAILQ_REMOVE_SEVERAL

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This is faster than removing elements one by one.

Will gain a user soon.

Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Emilio G. Cota 2018-12-06 19:04:07 -05:00 committed by Alex Bennée
parent 5c5d69b0d5
commit 050ec8cc18
1 changed files with 10 additions and 0 deletions
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10
include/qemu/queue.h
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@ -420,6 +420,16 @@ union { \
(elm)->field.tqe_circ.tql_prev = NULL; \
} while (/*CONSTCOND*/0)
/* remove @left, @right and all elements in between from @head */
#define QTAILQ_REMOVE_SEVERAL(head, left, right, field) do { \
if (((right)->field.tqe_next) != NULL) \
(right)->field.tqe_next->field.tqe_circ.tql_prev = \
(left)->field.tqe_circ.tql_prev; \
else \
(head)->tqh_circ.tql_prev = (left)->field.tqe_circ.tql_prev; \
(left)->field.tqe_circ.tql_prev->tql_next = (right)->field.tqe_next; \
} while (/*CONSTCOND*/0)
#define QTAILQ_FOREACH(var, head, field) \
for ((var) = ((head)->tqh_first); \
(var); \