MEDIUM: mux-h2: make the conditions to send based on mbuf, not just its tail

This is in preparation for iterating over lists. First we need to always
check the buffer's head and not its tail.

diff --git a/src/mux_h2.c b/src/mux_h2.c
index 7e9ba043d5d12e398e19ba603e0c7ab241f413bb..392848425f27f5ab5cab6a9356481ac7b52fc935 100644 (file)
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -310,7 +310,7 @@ h2c_is_dead(struct h2c *h2c)
            ((h2c->conn->flags & CO_FL_ERROR) ||    /* errors close immediately */
             (h2c->st0 >= H2_CS_ERROR && !h2c->task) || /* a timeout stroke earlier */
             (!(h2c->conn->owner)) || /* Nobody's left to take care of the connection, drop it now */
-            (!b_data(br_tail(h2c->mbuf)) &&  /* mux buffer empty, also process clean events below */
+            (!br_data(h2c->mbuf) &&  /* mux buffer empty, also process clean events below */
              (conn_xprt_read0_pending(h2c->conn) ||
               (h2c->last_sid >= 0 && h2c->max_id >= h2c->last_sid)))))
                return 1;
@@ -2775,7 +2775,7 @@ static int h2_send(struct h2c *h2c)
                if (h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))
                        flags |= CO_SFL_MSG_MORE;
 
-               if (b_data(br_tail(h2c->mbuf))) {
+               if (br_data(h2c->mbuf)) {
                        int ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, br_tail(h2c->mbuf), b_data(br_tail(h2c->mbuf)), flags);
                        if (!ret)
                                break;
@@ -2819,7 +2819,7 @@ static int h2_send(struct h2c *h2c)
                }
        }
        /* We're done, no more to send */
-       if (!b_data(br_tail(h2c->mbuf)))
+       if (!br_data(h2c->mbuf))
                return sent;
 schedule:
        if (!(h2c->wait_event.events & SUB_RETRY_SEND))
@@ -2912,13 +2912,13 @@ static int h2_process(struct h2c *h2c)
        if ((conn->flags & CO_FL_SOCK_WR_SH) ||
            h2c->st0 == H2_CS_ERROR2 || (h2c->flags & H2_CF_GOAWAY_FAILED) ||
            (h2c->st0 != H2_CS_ERROR &&
-            !b_data(br_tail(h2c->mbuf)) &&
+            !br_data(h2c->mbuf) &&
             (h2c->mws <= 0 || LIST_ISEMPTY(&h2c->fctl_list)) &&
             ((h2c->flags & H2_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&h2c->send_list))))
                h2_release_buf(h2c, br_tail(h2c->mbuf));
 
        if (h2c->task) {
-               if (eb_is_empty(&h2c->streams_by_id) || b_data(br_tail(h2c->mbuf))) {
+               if (eb_is_empty(&h2c->streams_by_id) || br_data(h2c->mbuf)) {
                        h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
                        task_queue(h2c->task);
                }
@@ -2963,7 +2963,7 @@ static struct task *h2_timeout_task(struct task *t, void *context, unsigned shor
        h2c_error(h2c, H2_ERR_NO_ERROR);
        h2_wake_some_streams(h2c, 0);
 
-       if (b_data(br_tail(h2c->mbuf))) {
+       if (br_data(h2c->mbuf)) {
                /* don't even try to send a GOAWAY, the buffer is stuck */
                h2c->flags |= H2_CF_GOAWAY_FAILED;
        }
@@ -2973,7 +2973,7 @@ static struct task *h2_timeout_task(struct task *t, void *context, unsigned shor
        if (h2c_send_goaway_error(h2c, NULL) <= 0)
                h2c->flags |= H2_CF_GOAWAY_FAILED;
 
-       if (b_data(br_tail(h2c->mbuf)) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) {
+       if (br_data(h2c->mbuf) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) {
                int ret = h2c->conn->xprt->snd_buf(h2c->conn, h2c->conn->xprt_ctx, br_tail(h2c->mbuf), b_data(br_tail(h2c->mbuf)), 0);
                if (ret > 0) {
                        b_del(br_tail(h2c->mbuf), ret);
@@ -3160,7 +3160,7 @@ static void h2_detach(struct conn_stream *cs)
                h2_release(h2c);
        }
        else if (h2c->task) {
-               if (eb_is_empty(&h2c->streams_by_id) || b_data(br_tail(h2c->mbuf))) {
+               if (eb_is_empty(&h2c->streams_by_id) || br_data(h2c->mbuf)) {
                        h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
                        task_queue(h2c->task);
                }