[PATCH 05/19] vl.c: add deleted flag for deleting the handler.

[Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>]

Make deleting handlers robust against deletion of any elements in a
handler by using a deleted flag like in file descriptors.

Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>
---
 vl.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/vl.c b/vl.c
index 768dbf4..f3b4a5b 100644
--- a/vl.c
+++ b/vl.c
@@ -1140,6 +1140,7 @@ static void nographic_update(void *opaque)
 struct vm_change_state_entry {
     VMChangeStateHandler *cb;
     void *opaque;
+    int deleted;
     QLIST_ENTRY (vm_change_state_entry) entries;
 };
 
@@ -1160,8 +1161,7 @@ VMChangeStateEntry *qemu_add_vm_change_state_handler(VMChangeStateHandler *cb,
 
 void qemu_del_vm_change_state_handler(VMChangeStateEntry *e)
 {
-    QLIST_REMOVE (e, entries);
-    qemu_free (e);
+    e->deleted = 1;
 }
 
 void vm_state_notify(int running, int reason)
@@ -1170,8 +1170,13 @@ void vm_state_notify(int running, int reason)
 
     trace_vm_state_notify(running, reason);
 
-    for (e = vm_change_state_head.lh_first; e; e = e->entries.le_next) {
-        e->cb(e->opaque, running, reason);
+    QLIST_FOREACH(e, &vm_change_state_head, entries) {
+        if (e->deleted) {
+            QLIST_REMOVE(e, entries);
+            qemu_free(e);
+        } else {
+            e->cb(e->opaque, running, reason);
+        }
     }
 }
 
-- 
1.7.1.2

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