1 files changed, 43 insertions, 7 deletions

diff --git a/lib/event.h b/lib/event.h
index 5f3b78d8..9773c3a9 100644
--- a/lib/event.h
+++ b/lib/event.h
@@ -10,33 +10,69 @@
 #define _BIRD_EVENT_H_
 
 #include "lib/resource.h"
+#include "lib/locking.h"
+
+#include <stdatomic.h>
+
+struct birdloop;
 
 typedef struct event {
   resource r;
   void (*hook)(void *);
   void *data;
-  node n;				/* Internal link */
+  struct event * _Atomic next;
 } event;
 
-typedef list event_list;
+typedef union event_list {
+  struct {
+    event * _Atomic receiver;	/* Event receive list */
+    event * _Atomic _executor;	/* Event execute list */
+    const char *name;
+    struct birdloop *loop;	/* The executor loop */
+    char _end[0];
+  };
+  event _sentinel;	/* Sentinel node to actively detect list end */
+} event_list;
 
 extern event_list global_event_list;
 extern event_list global_work_list;
 
 event *ev_new(pool *);
 void ev_run(event *);
-#define ev_init_list(el) init_list(el)
+void ev_init_list(event_list *, struct birdloop *loop, const char *name);
 void ev_enqueue(event_list *, event *);
-void ev_schedule(event *);
-void ev_schedule_work(event *);
+#define ev_send ev_enqueue
+#define ev_send_loop(l, e) ev_send(birdloop_event_list((l)), (e))
+
+#define ev_schedule(e) ({ ASSERT_THE_BIRD_LOCKED; if (!ev_active((e))) ev_send(&global_event_list, (e)); })
+#define ev_schedule_work(e) ({ ASSERT_THE_BIRD_LOCKED; if (!ev_active((e))) ev_send(&global_work_list, (e)); })
+
 void ev_postpone(event *);
-int ev_run_list(event_list *);
 int ev_run_list_limited(event_list *, uint);
+#define ev_run_list(l)	ev_run_list_limited((l), ~0)
+
+#define LEGACY_EVENT_LIST(l)  (((l) == &global_event_list) || ((l) == &global_work_list))
 
 static inline int
 ev_active(event *e)
 {
-  return e->n.next != NULL;
+  return atomic_load_explicit(&e->next, memory_order_relaxed) != NULL;
+}
+
+static inline event_list *
+ev_get_list(event *e)
+{
+  /* We are looking for the sentinel node at the list end.
+   * After this, we have s->next == NULL */
+  event *s = e;
+  for (event *sn; sn = atomic_load_explicit(&s->next, memory_order_acquire); s = sn)
+    ;
+
+  /* No sentinel, no list. */
+  if (s == e)
+    return NULL;
+  else
+    return SKIP_BACK(event_list, _sentinel, s);
 }
 
 static inline event*