QSIMPLEQ_CONCAT(a, b) joins a = a + b. The new QSIMPLEQ_PREPEND(a, b)
API joins a = b + a.
Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
Reviewed-by: Paolo Bonzini <pbonz...@redhat.com>
Message-id: 20180322152834.12656-2-stefa...@redhat.com
Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
---
include/qemu/queue.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/qemu/queue.h b/include/qemu/queue.h
index aa270d2b38..59fd1203a1 100644
--- a/include/qemu/queue.h
+++ b/include/qemu/queue.h
@@ -324,6 +324,14 @@ struct {
\
} \
} while (/*CONSTCOND*/0)
+#define QSIMPLEQ_PREPEND(head1, head2) do { \
+ if (!QSIMPLEQ_EMPTY((head2))) { \
+ *(head2)->sqh_last = (head1)->sqh_first; \
+ (head1)->sqh_first = (head2)->sqh_first; \
+ QSIMPLEQ_INIT((head2)); \
+ } \
+} while (/*CONSTCOND*/0)
+
#define QSIMPLEQ_LAST(head, type, field) \
(QSIMPLEQ_EMPTY((head)) ? \
NULL : \
--
2.14.3
