void nghttp2_stream_reschedule(nghttp2_stream *stream) {
nghttp2_stream *dep_stream;
assert(stream->queued);
dep_stream = stream->dep_prev;
for (; dep_stream; stream = dep_stream, dep_stream = dep_stream->dep_prev) {
if (nghttp2_pq_size(&dep_stream->obq) == 1) {
dep_stream->descendant_last_cycle = 0;
stream->cycle = 0;
} else {
dep_stream->descendant_last_cycle =
nghttp2_max(dep_stream->descendant_last_cycle, stream->cycle);
stream->cycle =
stream_next_cycle(stream, dep_stream->descendant_last_cycle);
nghttp2_pq_remove(&dep_stream->obq, &stream->pq_entry);
nghttp2_pq_push(&dep_stream->obq, &stream->pq_entry);
}
DEBUGF(fprintf(stderr, "stream: stream=%d obq resched cycle=%ld\n",
stream->stream_id, stream->cycle));
dep_stream->last_writelen = stream->last_writelen;
}
}
/*
* Removes |stream| from parent's obq. If removal of |stream| makes
* parent's obq empty, and parent is not active, then parent is also
* removed. This process is repeated recursively.
*/
static void stream_obq_remove(nghttp2_stream *stream) {
nghttp2_stream *dep_stream;
dep_stream = stream->dep_prev;
if (!stream->queued) {
return;
}
for (; dep_stream; stream = dep_stream, dep_stream = dep_stream->dep_prev) {
DEBUGF(fprintf(stderr, "stream: remove stream %d from stream %d\n",
stream->stream_id, dep_stream->stream_id));
nghttp2_pq_remove(&dep_stream->obq, &stream->pq_entry);
assert(stream->queued);
stream->queued = 0;
stream->cycle = 0;
stream->descendant_last_cycle = 0;
if (stream_subtree_active(dep_stream)) {
return;
}
}
}
void nghttp2_stream_change_weight(nghttp2_stream *stream, int32_t weight) {
nghttp2_stream *dep_stream;
uint32_t last_cycle;
int32_t old_weight;
uint32_t wlen_penalty;
if (stream->weight == weight) {
return;
}
old_weight = stream->weight;
stream->weight = weight;
dep_stream = stream->dep_prev;
if (!dep_stream) {
return;
}
dep_stream->sum_dep_weight += weight - old_weight;
if (!stream->queued) {
return;
}
nghttp2_pq_remove(&dep_stream->obq, &stream->pq_entry);
wlen_penalty = (uint32_t)stream->last_writelen * NGHTTP2_MAX_WEIGHT;
/* Compute old stream->pending_penalty we used to calculate
stream->cycle */
stream->pending_penalty =
(uint32_t)((stream->pending_penalty + (uint32_t)old_weight -
(wlen_penalty % (uint32_t)old_weight)) %
(uint32_t)old_weight);
last_cycle = stream->cycle -
(wlen_penalty + stream->pending_penalty) / (uint32_t)old_weight;
/* Now we have old stream->pending_penalty and new stream->weight in
place */
stream_next_cycle(stream, last_cycle);
if (stream->cycle < dep_stream->descendant_last_cycle &&
(dep_stream->descendant_last_cycle - stream->cycle) <=
NGHTTP2_MAX_CYCLE_DISTANCE) {
stream->cycle = dep_stream->descendant_last_cycle;
}
/* Continue to use same stream->seq */
nghttp2_pq_push(&dep_stream->obq, &stream->pq_entry);
DEBUGF("stream: stream=%d obq resched cycle=%d\n", stream->stream_id,
stream->cycle);
}
/*
* Moves |stream| from |src|'s obq to |dest|'s obq. Removal from
* |src|'s obq is just done calling nghttp2_pq_remove(), so it does
* not recursively remove |src| and ancestors, like
* stream_obq_remove().
*/
static int stream_obq_move(nghttp2_stream *dest, nghttp2_stream *src,
nghttp2_stream *stream) {
if (!stream->queued) {
return 0;
}
DEBUGF(fprintf(stderr, "stream: remove stream %d from stream %d (move)\n",
stream->stream_id, src->stream_id));
nghttp2_pq_remove(&src->obq, &stream->pq_entry);
stream->queued = 0;
return stream_obq_push(dest, stream);
}
void nghttp2_stream_reschedule(nghttp2_stream *stream) {
nghttp2_stream *dep_stream;
assert(stream->queued);
dep_stream = stream->dep_prev;
for (; dep_stream; stream = dep_stream, dep_stream = dep_stream->dep_prev) {
nghttp2_pq_remove(&dep_stream->obq, &stream->pq_entry);
stream_next_cycle(stream, dep_stream->descendant_last_cycle);
stream->seq = dep_stream->descendant_next_seq++;
nghttp2_pq_push(&dep_stream->obq, &stream->pq_entry);
DEBUGF("stream: stream=%d obq resched cycle=%d\n", stream->stream_id,
stream->cycle);
dep_stream->last_writelen = stream->last_writelen;
}
}