diff mbox

[v7,02/26] queue: Add macro for incremental traversal

Message ID 149815344951.1830.10391111520714284403.stgit@frigg.lan (mailing list archive)
State New, archived
Headers show

Commit Message

Lluís Vilanova June 22, 2017, 5:44 p.m. UTC 
Adds macro QTAILQ_FOREACH_CONTINUE to support incremental list
traversal.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
---
 include/qemu/queue.h |   12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/include/qemu/queue.h b/include/qemu/queue.h
index 35292c3155..eb2bf9cb1c 100644
--- a/include/qemu/queue.h
+++ b/include/qemu/queue.h
@@ -415,6 +415,18 @@  struct {                                                                \
                 (var);                                                  \
                 (var) = ((var)->field.tqe_next))
 
+/**
+ * QTAILQ_FOREACH_CONTINUE:
+ * @var: Variable to resume iteration from.
+ * @field: Field in @var holding a QTAILQ_ENTRY for this queue.
+ *
+ * Resumes iteration on a queue from the element in @var.
+ */
+#define QTAILQ_FOREACH_CONTINUE(var, field)                             \
+        for ((var) = ((var)->field.tqe_next);                           \
+                (var);                                                  \
+                (var) = ((var)->field.tqe_next))
+
 #define QTAILQ_FOREACH_SAFE(var, head, field, next_var)                 \
         for ((var) = ((head)->tqh_first);                               \
                 (var) && ((next_var) = ((var)->field.tqe_next), 1);     \