diff mbox series

[v4,16/54] queue: add QTAILQ_REMOVE_SEVERAL

Message ID 20190731160719.11396-17-alex.bennee@linaro.org (mailing list archive)
State New, archived
Headers show
Series plugins for TCG | expand

Commit Message

Alex Bennée July 31, 2019, 4:06 p.m. UTC 
From: "Emilio G. Cota" <cota@braap.org>

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>
---
 include/qemu/queue.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

Comments

Richard Henderson Aug. 1, 2019, 4:16 p.m. UTC | #1 
On 7/31/19 9:06 AM, Alex Bennée wrote:
> From: "Emilio G. Cota" <cota@braap.org>
> 
> 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>
> ---
>  include/qemu/queue.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
Richard Henderson Aug. 1, 2019, 4:16 p.m. UTC | #2 
On 7/31/19 9:06 AM, Alex Bennée wrote:
> From: "Emilio G. Cota" <cota@braap.org>
> 
> 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>
> ---
>  include/qemu/queue.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~
diff mbox series

Patch

diff --git a/include/qemu/queue.h b/include/qemu/queue.h
index 0379bd8fdbb..66e834dad11 100644
--- a/include/qemu/queue.h
+++ b/include/qemu/queue.h
@@ -422,6 +422,16 @@  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);                                                  \