[Qemu-devel] [PATCH 1/2] Add TAILQ_FOREACH_SAFE

[Jan Kiszka]

Add TAILQ iterator that allows to safely remove elements while walking
the list.

Signed-off-by: Jan Kiszka <address@hidden>
---

 sys-queue.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/sys-queue.h b/sys-queue.h
index 3d0773e..b92a77f 100644
--- a/sys-queue.h
+++ b/sys-queue.h
@@ -210,6 +210,12 @@ struct {                                                   
             \
                 (var);                                                  \
                 (var) = ((var)->field.tqe_next))
 
+#define TAILQ_FOREACH_SAFE(var, head, field, next_var)                  \
+        for ((var) = ((head)->tqh_first);                               \
+                (var) ? ({ (next_var) = ((var)->field.tqe_next); 1; })  \
+                      : 0;                                              \
+                (var) = (next_var))
+
 #define TAILQ_FOREACH_REVERSE(var, head, headname, field)               \
         for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last));   
 \
                 (var);                                                  \