For safer memory allocations, resources are bound to loops.

Also all loops have their basic resource pool for allocations which are
auto-freed when the loop is stopping.

sysdep/unix/io-loop.h

@@ -9,7 +9,10 @@
 
 struct birdloop
 {
+  resource r;
+
   pool *pool;
+  pool *parent;
 
   struct timeloop time;
   event_list event_list;