More --timeout improvements, especially for the receiving side:

- The receiver now sends keep-alive messages to the generator
  when it is actively doing work and hasn't sent anything
  recently.  This ensures that the generator won't timeout
  if the receiver is working hard.
- The perform_io() code has improved keep-alive participation.
- Allow the sender to send some keep-alive messages, which
  ensures that if it is in a lull, it can probe the socket.

1 files changed, 2 insertions, 3 deletions

diff --git a/sender.c b/sender.c
index 60820dd8..600ad847 100644
--- a/sender.c
+++ b/sender.c
@@ -43,7 +43,6 @@ extern int inplace;
 extern int batch_fd;
 extern int write_batch;
 extern int file_old_total;
-extern BOOL we_send_keepalive_messages;
 extern struct stats stats;
 extern struct file_list *cur_flist, *first_flist, *dir_flist;
 
@@ -64,7 +63,7 @@ static struct sum_struct *receive_sums(int f)
 {
 	struct sum_struct *s;
 	int32 i;
-	int lull_mod = allowed_lull * 5;
+	int lull_mod = protocol_version >= 31 ? 0 : allowed_lull * 5;
 	OFF_T offset = 0;
 
 	if (!(s = new(struct sum_struct)))
@@ -105,7 +104,7 @@ static struct sum_struct *receive_sums(int f)
 			s->sums[i].len = s->blength;
 		offset += s->sums[i].len;
 
-		if (we_send_keepalive_messages && !(i % lull_mod))
+		if (lull_mod && !(i % lull_mod))
 			maybe_send_keepalive(time(NULL), True);
 
 		if (DEBUG_GTE(DELTASUM, 3)) {