Converting the former BFD loop to a universal IO loop and protocol loop.

There is a simple universal IO loop, taking care of events, timers and
sockets. Primarily, one instance of a protocol should use exactly one IO
loop to do all its work, as is now done in BFD.

Contrary to previous versions, the loop is now launched and cleaned by
the nest/proto.c code, allowing for a protocol to just request its own
loop by setting the loop's lock order in config higher than the_bird.

It is not supported nor checked if any protocol changed the requested
lock order in reconfigure. No protocol should do it at all.

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/lists.h b/lib/lists.h
index 64b4a981..dc49ec8a 100644
--- a/lib/lists.h
+++ b/lib/lists.h
@@ -68,6 +68,18 @@ typedef union list {			/* In fact two overlayed nodes */
 
 #define EMPTY_LIST(list) (!(list).head->next)
 
+static inline _Bool
+enlisted(node *n)
+{
+  switch ((!!n->next) + (!!n->prev))
+  {
+    case 0: return 0;
+    case 2: return 1;
+    case 1: bug("Garbled event list node");
+  }
+
+  bug("Maths is broken. And you should see a new heaven and a new earth: for the first heaven and the first earth had been passed away.");
+}
 
 #ifndef _BIRD_LISTS_C_
 #define LIST_INLINE static inline