Fix event_dlist definition when sys/queue not included

This header adds TAILQ_HEAD and TAILQ_ENTRY if sys/queue is not included.
There is a similar macro that adds LIST_ENTRY but not LIST_HEAD, even though
LIST_HEAD is used later.

This change pulls in the correct definition (swiped from sys/queue) for
LIST_HEAD and cleans up the one spot where it is used.  The change can be
tested by adding

	#undef LIST_HEAD
	#undef LIST_ENTRY

right before the #ifndef checks and removing

	#define EVENT_DEFINED_LISTENTRY_
	#define EVENT_DEFINED_LISTHEAD_

so that the macros persist later.

diff --git a/include/event2/event_struct.h b/include/event2/event_struct.h
index cf7b3df359c4a2450987ca0a6d5b70fef51d2f00..8d0428462588e7e694ac1772da4fff9f6fae56a7 100644 (file)
--- a/include/event2/event_struct.h
+++ b/include/event2/event_struct.h
@@ -91,7 +91,15 @@ struct {                                                             \
        struct type *le_next;   /* next element */                      \
        struct type **le_prev;  /* address of previous next element */  \
 }
-#endif /* !TAILQ_ENTRY */
+#endif /* !LIST_ENTRY */
+
+#ifndef LIST_HEAD
+#define EVENT_DEFINED_LISTHEAD_
+#define LIST_HEAD(name, type)                                          \
+struct name {                                                          \
+       struct type *lh_first;  /* first element */                     \
+       }
+#endif /* !LIST_HEAD */
 
 struct event_callback {
        TAILQ_ENTRY(event_callback) evcb_active_next;
@@ -150,13 +158,15 @@ TAILQ_HEAD (event_list, event);
 #undef TAILQ_HEAD
 #endif
 
+LIST_HEAD (event_dlist, event); 
+
 #ifdef EVENT_DEFINED_LISTENTRY_
 #undef LIST_ENTRY
-struct event_dlist;
-#undef EVENT_DEFINED_LISTENTRY_
-#else
-LIST_HEAD (event_dlist, event);
-#endif /* EVENT_DEFINED_LISTENTRY_ */
+#endif
+
+#ifdef EVENT_DEFINED_LISTHEAD_
+#undef LIST_HEAD
+#endif
 
 #ifdef __cplusplus
 }