Avoid calling the poll callback for UDP style channels.

We still call it on connection establishment and on errors, but we don't
call it when we have space free in the send buffer.

diff --git a/utcp.c b/utcp.c
index 6279d925a781814eeb06710c406fa47063c2f052..aa1c50f79c965709276951f992fd3e681c6feb94 100644 (file)
--- a/utcp.c
+++ b/utcp.c
@@ -816,7 +816,6 @@ ssize_t utcp_send(struct utcp_connection *c, const void *data, size_t len) {
        if(!is_reliable(c)) {
                c->snd.una = c->snd.nxt = c->snd.last;
                buffer_discard(&c->sndbuf, c->sndbuf.used);
-               c->do_poll = true;
        }
 
        if(is_reliable(c) && !timespec_isset(&c->rtrx_timeout)) {
@@ -1594,7 +1593,10 @@ synack:
 
                if(data_acked) {
                        buffer_discard(&c->sndbuf, data_acked);
-                       c->do_poll = true;
+
+                       if(is_reliable(c)) {
+                               c->do_poll = true;
+                       }
                }
 
                // Also advance snd.nxt if possible
@@ -2318,7 +2320,7 @@ void utcp_set_sndbuf(struct utcp_connection *c, size_t size) {
                c->sndbuf.maxsize = -1;
        }
 
-       c->do_poll = buffer_free(&c->sndbuf);
+       c->do_poll = is_reliable(c) && buffer_free(&c->sndbuf);
 }
 
 size_t utcp_get_rcvbuf(struct utcp_connection *c) {
@@ -2386,7 +2388,7 @@ void utcp_set_recv_cb(struct utcp_connection *c, utcp_recv_t recv) {
 void utcp_set_poll_cb(struct utcp_connection *c, utcp_poll_t poll) {
        if(c) {
                c->poll = poll;
-               c->do_poll = buffer_free(&c->sndbuf);
+               c->do_poll = is_reliable(c) && buffer_free(&c->sndbuf);
        }
 }