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, 21 insertions, 20 deletions

diff --git a/sysdep/unix/io-loop.h b/sysdep/unix/io-loop.h
index d858b04e..4024b6c5 100644
--- a/sysdep/unix/io-loop.h
+++ b/sysdep/unix/io-loop.h
@@ -4,31 +4,32 @@
  *	Can be freely distributed and used under the terms of the GNU GPL.
  */
 
-#ifndef _BIRD_IO_LOOP_H_
-#define _BIRD_IO_LOOP_H_
+#ifndef _BIRD_SYSDEP_UNIX_IO_LOOP_H_
+#define _BIRD_SYSDEP_UNIX_IO_LOOP_H_
 
-#include "nest/bird.h"
-#include "lib/lists.h"
-#include "lib/resource.h"
-#include "lib/event.h"
-#include "lib/timer.h"
-#include "lib/socket.h"
+struct birdloop
+{
+  pool *pool;
 
+  struct timeloop time;
+  event_list event_list;
+  list sock_list;
+  uint sock_num;
 
-void ev2_schedule(event *e);
+  BUFFER(sock *) poll_sk;
+  BUFFER(struct pollfd) poll_fd;
+  u8 poll_changed;
+  u8 close_scheduled;
 
-void sk_start(sock *s);
-void sk_stop(sock *s);
+  _Atomic u32 ping_sent;
+  int wakeup_fds[2];
 
-struct birdloop *birdloop_new(void);
-void birdloop_start(struct birdloop *loop);
-void birdloop_stop(struct birdloop *loop);
-void birdloop_free(struct birdloop *loop);
+  uint links;
 
-void birdloop_enter(struct birdloop *loop);
-void birdloop_leave(struct birdloop *loop);
-void birdloop_mask_wakeups(struct birdloop *loop);
-void birdloop_unmask_wakeups(struct birdloop *loop);
+  void (*stopped)(void *data);
+  void *stop_data;
 
+  struct birdloop *prev_loop;
+};
 
-#endif /* _BIRD_IO_LOOP_H_ */
+#endif