nghttp2/lib/nghttp2_stream.c

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/*
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* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
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#include "nghttp2_stream.h"
#include <assert.h>
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#include <stdio.h>
#include "nghttp2_session.h"
#include "nghttp2_helper.h"
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void nghttp2_stream_init(nghttp2_stream *stream, int32_t stream_id,
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uint8_t flags, nghttp2_stream_state initial_state,
int32_t weight, nghttp2_stream_roots *roots,
int32_t remote_initial_window_size,
int32_t local_initial_window_size,
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void *stream_user_data) {
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nghttp2_map_entry_init(&stream->map_entry, stream_id);
stream->stream_id = stream_id;
stream->flags = flags;
stream->state = initial_state;
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stream->shut_flags = NGHTTP2_SHUT_NONE;
stream->stream_user_data = stream_user_data;
stream->item = NULL;
stream->remote_window_size = remote_initial_window_size;
stream->local_window_size = local_initial_window_size;
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stream->recv_window_size = 0;
stream->consumed_size = 0;
stream->recv_reduction = 0;
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stream->dep_prev = NULL;
stream->dep_next = NULL;
stream->sib_prev = NULL;
stream->sib_next = NULL;
stream->closed_prev = NULL;
stream->closed_next = NULL;
stream->dpri = NGHTTP2_STREAM_DPRI_NO_ITEM;
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stream->num_substreams = 1;
stream->weight = weight;
stream->sum_dep_weight = 0;
stream->sum_norest_weight = 0;
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stream->roots = roots;
stream->root_prev = NULL;
stream->root_next = NULL;
stream->http_flags = NGHTTP2_HTTP_FLAG_NONE;
stream->content_length = -1;
stream->recv_content_length = 0;
stream->status_code = -1;
}
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void nghttp2_stream_free(nghttp2_stream *stream _U_) {
/* We don't free stream->item. If it is assigned to aob, then
active_outbound_item_reset() will delete it. If it is queued,
then it is deleted when pq is deleted in nghttp2_session_del().
Otherwise, nghttp2_session_del() will delete it. */
}
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void nghttp2_stream_shutdown(nghttp2_stream *stream, nghttp2_shut_flag flag) {
stream->shut_flags |= flag;
}
static int stream_push_item(nghttp2_stream *stream, nghttp2_session *session) {
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/* This is required for Android NDK r10d */
int rv = 0;
nghttp2_outbound_item *item;
assert(stream->item);
assert(stream->item->queued == 0);
item = stream->item;
/* If item is now sent, don't push it to the queue. Otherwise, we
may push same item twice. */
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if (session->aob.item == item) {
return 0;
}
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switch (item->frame.hd.type) {
case NGHTTP2_DATA:
/* Penalize item by delaying scheduling according to effective
weight. This will delay low priority stream, which is good.
OTOH, this may incur delay for high priority item. Will
see. */
item->cycle = session->last_cycle +
NGHTTP2_DATA_PAYLOADLEN * NGHTTP2_MAX_WEIGHT /
nghttp2_stream_compute_effective_weight(stream);
rv = nghttp2_pq_push(&session->ob_da_pq, item);
if (rv != 0) {
return rv;
}
break;
case NGHTTP2_HEADERS:
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if (stream->state == NGHTTP2_STREAM_RESERVED) {
nghttp2_outbound_queue_push(&session->ob_syn, item);
} else {
nghttp2_outbound_queue_push(&session->ob_reg, item);
}
break;
default:
/* should not reach here */
assert(0);
}
item->queued = 1;
return 0;
}
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static nghttp2_stream *stream_last_sib(nghttp2_stream *stream) {
for (; stream->sib_next; stream = stream->sib_next)
;
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return stream;
}
static void stream_update_dep_length(nghttp2_stream *stream, ssize_t delta) {
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stream->num_substreams += delta;
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if (stream->dep_prev) {
stream_update_dep_length(stream->dep_prev, delta);
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}
}
int32_t nghttp2_stream_dep_distributed_weight(nghttp2_stream *stream,
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int32_t weight) {
weight = stream->weight * weight / stream->sum_dep_weight;
return nghttp2_max(1, weight);
}
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static void stream_update_dep_set_rest(nghttp2_stream *stream) {
if (stream == NULL) {
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return;
}
DEBUGF(fprintf(stderr, "stream: stream=%d is rest\n", stream->stream_id));
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if (stream->dpri == NGHTTP2_STREAM_DPRI_REST) {
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return;
}
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if (stream->dpri == NGHTTP2_STREAM_DPRI_TOP) {
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stream->dpri = NGHTTP2_STREAM_DPRI_REST;
stream_update_dep_set_rest(stream->sib_next);
return;
}
stream_update_dep_set_rest(stream->sib_next);
stream_update_dep_set_rest(stream->dep_next);
}
/*
* Performs dfs starting |stream|, search stream which can become
* NGHTTP2_STREAM_DPRI_TOP and set its dpri. This function also
* updates sum_norest_weight if stream->dpri ==
* NGHTTP2_STREAM_DPRI_NO_ITEM. This function returns nonzero if
* stream's subtree contains at least one NGHTTP2_STRAEM_DPRI_TOP
* stream.
*/
static int stream_update_dep_set_top(nghttp2_stream *stream) {
nghttp2_stream *si;
if (!stream) {
return 0;
}
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if (stream->dpri == NGHTTP2_STREAM_DPRI_TOP) {
return 1;
}
stream->sum_norest_weight = 0;
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if (stream->dpri == NGHTTP2_STREAM_DPRI_REST) {
DEBUGF(
fprintf(stderr, "stream: stream=%d item is top\n", stream->stream_id));
stream->dpri = NGHTTP2_STREAM_DPRI_TOP;
return 1;
}
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for (si = stream->dep_next; si; si = si->sib_next) {
if (stream_update_dep_set_top(si)) {
stream->sum_norest_weight += si->weight;
}
}
return stream->sum_norest_weight > 0;
}
/*
* Performs dfs starting |stream|, and dueue stream whose dpri is
* NGHTTP2_STREAM_DPRI_TOP and has not been queued yet.
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*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
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*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
static int stream_update_dep_queue_top(nghttp2_stream *stream,
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nghttp2_session *session) {
int rv;
nghttp2_stream *si;
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if (stream->dpri == NGHTTP2_STREAM_DPRI_REST) {
return 0;
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}
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if (stream->dpri == NGHTTP2_STREAM_DPRI_TOP) {
if (!stream->item->queued) {
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DEBUGF(fprintf(stderr, "stream: stream=%d enqueue\n", stream->stream_id));
rv = stream_push_item(stream, session);
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if (rv != 0) {
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return rv;
}
}
return 0;
}
if (stream->sum_norest_weight == 0) {
return 0;
}
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for (si = stream->dep_next; si; si = si->sib_next) {
rv = stream_update_dep_queue_top(si, session);
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if (rv != 0) {
return rv;
}
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}
return 0;
}
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/*
* Updates stream->sum_norest_weight recursively towards root.
* |delta| must not be 0. We have to gather effective sum of weight
* of descendants. |delta| is added to stream->sum_norest_weight. If
* stream->sum_norest_weight becomes 0, we have to update parent
* stream, decreasing its sum_norest_weight by stream->weight. If
* stream->sum_norest_weight becomes from 0 to positive, then we have
* to update parent stream, increasing its sum_norest_weight by
* stream->weight. Otherwise, we stop recursive call.
*/
static void stream_update_dep_sum_norest_weight(nghttp2_stream *stream,
int32_t delta) {
int32_t old;
if (!stream) {
return;
}
assert(delta != 0);
assert(stream->sum_norest_weight + delta >= 0);
old = stream->sum_norest_weight;
stream->sum_norest_weight += delta;
if (old == 0) {
assert(delta > 0);
stream_update_dep_sum_norest_weight(stream->dep_prev, stream->weight);
return;
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}
assert(old > 0);
if (stream->sum_norest_weight == 0) {
stream_update_dep_sum_norest_weight(stream->dep_prev, -stream->weight);
}
}
/*
* Returns stream whose dpri is NGHTTP2_STREAM_DPRI_NO_ITEM along the
* path following stream->dep_prev (stream's ancestors, including
* itself). In other words, find stream which blocks the descendant
* streams. If there is no such stream, returns NULL.
*/
static nghttp2_stream *stream_get_dep_blocking(nghttp2_stream *stream) {
for (; stream; stream = stream->dep_prev) {
if (stream->dpri != NGHTTP2_STREAM_DPRI_NO_ITEM) {
return stream;
}
}
return NULL;
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}
static int stream_update_dep_on_attach_item(nghttp2_stream *stream,
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nghttp2_session *session) {
nghttp2_stream *blocking_stream;
int rv;
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stream->dpri = NGHTTP2_STREAM_DPRI_REST;
blocking_stream = stream_get_dep_blocking(stream->dep_prev);
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/* If we found REST or TOP in ascendants, we don't have to update
any metadata. */
if (blocking_stream) {
return 0;
}
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stream->dpri = NGHTTP2_STREAM_DPRI_TOP;
if (stream->sum_norest_weight == 0) {
stream_update_dep_sum_norest_weight(stream->dep_prev, stream->weight);
} else {
stream_update_dep_set_rest(stream->dep_next);
}
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if (!stream->item->queued) {
DEBUGF(fprintf(stderr, "stream: stream=%d enqueue\n", stream->stream_id));
rv = stream_push_item(stream, session);
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if (rv != 0) {
return rv;
}
}
return 0;
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}
static int stream_update_dep_on_detach_item(nghttp2_stream *stream,
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nghttp2_session *session) {
if (stream->dpri == NGHTTP2_STREAM_DPRI_REST) {
stream->dpri = NGHTTP2_STREAM_DPRI_NO_ITEM;
return 0;
}
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assert(stream->dpri == NGHTTP2_STREAM_DPRI_TOP);
stream->dpri = NGHTTP2_STREAM_DPRI_NO_ITEM;
if (stream_update_dep_set_top(stream) == 0) {
stream_update_dep_sum_norest_weight(stream->dep_prev, -stream->weight);
return 0;
}
return stream_update_dep_queue_top(stream->dep_next, session);
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}
int nghttp2_stream_attach_item(nghttp2_stream *stream,
nghttp2_outbound_item *item,
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nghttp2_session *session) {
assert((stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_ALL) == 0);
assert(stream->item == NULL);
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DEBUGF(fprintf(stderr, "stream: stream=%d attach item=%p\n",
stream->stream_id, item));
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stream->item = item;
return stream_update_dep_on_attach_item(stream, session);
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}
int nghttp2_stream_detach_item(nghttp2_stream *stream,
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nghttp2_session *session) {
DEBUGF(fprintf(stderr, "stream: stream=%d detach item=%p\n",
stream->stream_id, stream->item));
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stream->item = NULL;
stream->flags &= ~NGHTTP2_STREAM_FLAG_DEFERRED_ALL;
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return stream_update_dep_on_detach_item(stream, session);
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}
int nghttp2_stream_defer_item(nghttp2_stream *stream, uint8_t flags,
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nghttp2_session *session) {
assert(stream->item);
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DEBUGF(fprintf(stderr, "stream: stream=%d defer item=%p cause=%02x\n",
stream->stream_id, stream->item, flags));
stream->flags |= flags;
return stream_update_dep_on_detach_item(stream, session);
}
int nghttp2_stream_resume_deferred_item(nghttp2_stream *stream, uint8_t flags,
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nghttp2_session *session) {
assert(stream->item);
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DEBUGF(fprintf(stderr, "stream: stream=%d resume item=%p flags=%02x\n",
stream->stream_id, stream->item, flags));
stream->flags &= ~flags;
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if (stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_ALL) {
return 0;
}
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return stream_update_dep_on_attach_item(stream, session);
}
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int nghttp2_stream_check_deferred_item(nghttp2_stream *stream) {
return stream->item && (stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_ALL);
}
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int nghttp2_stream_check_deferred_by_flow_control(nghttp2_stream *stream) {
return stream->item &&
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(stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_FLOW_CONTROL);
}
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static int update_initial_window_size(int32_t *window_size_ptr,
int32_t new_initial_window_size,
int32_t old_initial_window_size) {
int64_t new_window_size = (int64_t)(*window_size_ptr) +
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new_initial_window_size - old_initial_window_size;
if (INT32_MIN > new_window_size ||
new_window_size > NGHTTP2_MAX_WINDOW_SIZE) {
return -1;
}
*window_size_ptr = (int32_t)new_window_size;
return 0;
}
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int nghttp2_stream_update_remote_initial_window_size(
nghttp2_stream *stream, int32_t new_initial_window_size,
int32_t old_initial_window_size) {
return update_initial_window_size(&stream->remote_window_size,
new_initial_window_size,
old_initial_window_size);
}
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int nghttp2_stream_update_local_initial_window_size(
nghttp2_stream *stream, int32_t new_initial_window_size,
int32_t old_initial_window_size) {
return update_initial_window_size(&stream->local_window_size,
new_initial_window_size,
old_initial_window_size);
}
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void nghttp2_stream_promise_fulfilled(nghttp2_stream *stream) {
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stream->state = NGHTTP2_STREAM_OPENED;
stream->flags &= ~NGHTTP2_STREAM_FLAG_PUSH;
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}
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nghttp2_stream *nghttp2_stream_get_dep_root(nghttp2_stream *stream) {
for (; stream->dep_prev; stream = stream->dep_prev)
;
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return stream;
}
int nghttp2_stream_dep_subtree_find(nghttp2_stream *stream,
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nghttp2_stream *target) {
if (stream == NULL) {
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return 0;
}
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if (stream == target) {
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return 1;
}
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if (nghttp2_stream_dep_subtree_find(stream->sib_next, target)) {
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return 1;
}
return nghttp2_stream_dep_subtree_find(stream->dep_next, target);
}
int32_t nghttp2_stream_compute_effective_weight(nghttp2_stream *stream) {
int32_t weight;
if (!stream->dep_prev) {
return stream->weight;
}
weight = nghttp2_stream_compute_effective_weight(stream->dep_prev) *
stream->weight / stream->dep_prev->sum_norest_weight;
return nghttp2_max(1, weight);
}
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void nghttp2_stream_dep_insert(nghttp2_stream *dep_stream,
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nghttp2_stream *stream) {
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nghttp2_stream *si;
nghttp2_stream *blocking_stream;
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assert(stream->dpri == NGHTTP2_STREAM_DPRI_NO_ITEM);
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DEBUGF(fprintf(stderr,
"stream: dep_insert dep_stream(%p)=%d, stream(%p)=%d\n",
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dep_stream, dep_stream->stream_id, stream, stream->stream_id));
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stream->sum_dep_weight = dep_stream->sum_dep_weight;
dep_stream->sum_dep_weight = stream->weight;
blocking_stream = stream_get_dep_blocking(dep_stream);
stream->sum_norest_weight = 0;
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if (dep_stream->dep_next) {
assert(dep_stream->num_substreams >= 1);
/* num_substreams includes node itself */
stream->num_substreams = dep_stream->num_substreams;
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for (si = dep_stream->dep_next; si; si = si->sib_next) {
si->dep_prev = stream;
if (!blocking_stream && (si->dpri == NGHTTP2_STREAM_DPRI_TOP ||
(si->dpri == NGHTTP2_STREAM_DPRI_NO_ITEM &&
si->sum_norest_weight))) {
stream->sum_norest_weight += si->weight;
}
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}
stream->dep_next = dep_stream->dep_next;
}
dep_stream->dep_next = stream;
stream->dep_prev = dep_stream;
if (stream->sum_norest_weight) {
dep_stream->sum_norest_weight = stream->weight;
}
stream_update_dep_length(dep_stream, 1);
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++stream->roots->num_streams;
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}
static void set_dep_prev(nghttp2_stream *stream, nghttp2_stream *dep) {
for (; stream; stream = stream->sib_next) {
stream->dep_prev = dep;
}
}
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static void link_dep(nghttp2_stream *dep_stream, nghttp2_stream *stream) {
dep_stream->dep_next = stream;
if (stream) {
stream->dep_prev = dep_stream;
}
}
static void link_sib(nghttp2_stream *a, nghttp2_stream *b) {
a->sib_next = b;
if (b) {
b->sib_prev = a;
}
}
static void insert_link_dep(nghttp2_stream *dep_stream,
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nghttp2_stream *stream) {
nghttp2_stream *sib_next;
assert(stream->sib_prev == NULL);
sib_next = dep_stream->dep_next;
link_sib(stream, sib_next);
link_dep(dep_stream, stream);
}
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static void unlink_sib(nghttp2_stream *stream) {
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nghttp2_stream *prev, *next, *dep_next;
prev = stream->sib_prev;
dep_next = stream->dep_next;
assert(prev);
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if (dep_next) {
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/*
* prev--stream(--sib_next--...)
* |
* dep_next
*/
link_sib(prev, dep_next);
set_dep_prev(dep_next, stream->dep_prev);
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if (stream->sib_next) {
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link_sib(stream_last_sib(dep_next), stream->sib_next);
}
} else {
/*
* prev--stream(--sib_next--...)
*/
next = stream->sib_next;
prev->sib_next = next;
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if (next) {
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next->sib_prev = prev;
}
}
}
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static void unlink_dep(nghttp2_stream *stream) {
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nghttp2_stream *prev, *next, *dep_next;
prev = stream->dep_prev;
dep_next = stream->dep_next;
assert(prev);
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if (dep_next) {
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/*
* prev
* |
* stream(--sib_next--...)
* |
* dep_next
*/
link_dep(prev, dep_next);
set_dep_prev(dep_next, stream->dep_prev);
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if (stream->sib_next) {
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link_sib(stream_last_sib(dep_next), stream->sib_next);
}
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} else if (stream->sib_next) {
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/*
* prev
* |
* stream--sib_next
*/
next = stream->sib_next;
next->sib_prev = NULL;
link_dep(prev, next);
} else {
prev->dep_next = NULL;
}
}
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void nghttp2_stream_dep_add(nghttp2_stream *dep_stream,
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nghttp2_stream *stream) {
assert(stream->dpri == NGHTTP2_STREAM_DPRI_NO_ITEM);
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DEBUGF(fprintf(stderr, "stream: dep_add dep_stream(%p)=%d, stream(%p)=%d\n",
dep_stream, dep_stream->stream_id, stream, stream->stream_id));
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stream_update_dep_length(dep_stream, 1);
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dep_stream->sum_dep_weight += stream->weight;
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if (dep_stream->dep_next == NULL) {
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link_dep(dep_stream, stream);
} else {
insert_link_dep(dep_stream, stream);
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}
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++stream->roots->num_streams;
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}
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void nghttp2_stream_dep_remove(nghttp2_stream *stream) {
nghttp2_stream *next, *dep_prev, *si, *blocking_stream;
int32_t sum_dep_weight_delta, sum_norest_weight_delta;
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assert(stream->dpri == NGHTTP2_STREAM_DPRI_NO_ITEM);
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DEBUGF(fprintf(stderr, "stream: dep_remove stream(%p)=%d\n", stream,
stream->stream_id));
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blocking_stream = stream_get_dep_blocking(stream->dep_prev);
/* Distribute weight of |stream| to direct descendants */
sum_dep_weight_delta = -stream->weight;
sum_norest_weight_delta = 0;
/* blocking_stream == NULL means that ascendants are all
NGHTTP2_STREAM_DPRI_NO_ITEM */
if (!blocking_stream && stream->sum_norest_weight) {
sum_norest_weight_delta -= stream->weight;
}
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for (si = stream->dep_next; si; si = si->sib_next) {
si->weight = nghttp2_stream_dep_distributed_weight(stream, si->weight);
sum_dep_weight_delta += si->weight;
if (!blocking_stream &&
(si->dpri == NGHTTP2_STREAM_DPRI_TOP ||
(si->dpri == NGHTTP2_STREAM_DPRI_NO_ITEM && si->sum_norest_weight))) {
sum_norest_weight_delta += si->weight;
}
}
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dep_prev = stream->dep_prev;
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if (dep_prev) {
stream_update_dep_length(dep_prev, -1);
dep_prev->sum_dep_weight += sum_dep_weight_delta;
dep_prev->sum_norest_weight += sum_norest_weight_delta;
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}
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if (stream->sib_prev) {
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unlink_sib(stream);
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} else if (stream->dep_prev) {
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unlink_dep(stream);
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} else {
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nghttp2_stream_roots_remove(stream->roots, stream);
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/* stream is a root of tree. Removing stream makes its
descendants a root of its own subtree. */
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for (si = stream->dep_next; si;) {
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next = si->sib_next;
si->dep_prev = NULL;
si->sib_prev = NULL;
si->sib_next = NULL;
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nghttp2_stream_roots_add(si->roots, si);
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si = next;
}
}
stream->num_substreams = 1;
stream->sum_dep_weight = 0;
stream->sum_norest_weight = 0;
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stream->dep_prev = NULL;
stream->dep_next = NULL;
stream->sib_prev = NULL;
stream->sib_next = NULL;
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--stream->roots->num_streams;
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}
int nghttp2_stream_dep_insert_subtree(nghttp2_stream *dep_stream,
nghttp2_stream *stream,
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nghttp2_session *session) {
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nghttp2_stream *last_sib;
nghttp2_stream *dep_next;
nghttp2_stream *blocking_stream;
nghttp2_stream *si;
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size_t delta_substreams;
DEBUGF(fprintf(stderr, "stream: dep_insert_subtree dep_stream(%p)=%d "
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"stream(%p)=%d\n",
dep_stream, dep_stream->stream_id, stream, stream->stream_id));
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delta_substreams = stream->num_substreams;
blocking_stream = stream_get_dep_blocking(dep_stream);
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if (dep_stream->dep_next) {
/* dep_stream->num_substreams includes dep_stream itself */
stream->num_substreams += dep_stream->num_substreams - 1;
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stream->sum_dep_weight += dep_stream->sum_dep_weight;
dep_stream->sum_dep_weight = stream->weight;
dep_next = dep_stream->dep_next;
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if (!blocking_stream && dep_stream->sum_norest_weight) {
stream_update_dep_set_rest(dep_next);
}
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link_dep(dep_stream, stream);
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if (stream->dep_next) {
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last_sib = stream_last_sib(stream->dep_next);
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link_sib(last_sib, dep_next);
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} else {
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link_dep(stream, dep_next);
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}
for (si = dep_next; si; si = si->sib_next) {
si->dep_prev = stream;
}
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} else {
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link_dep(dep_stream, stream);
assert(dep_stream->sum_dep_weight == 0);
dep_stream->sum_dep_weight = stream->weight;
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}
stream_update_dep_length(dep_stream, delta_substreams);
if (blocking_stream) {
stream_update_dep_set_rest(stream);
return 0;
}
if (stream_update_dep_set_top(stream) == 0) {
return 0;
}
dep_stream->sum_norest_weight = stream->weight;
stream_update_dep_sum_norest_weight(dep_stream->dep_prev, dep_stream->weight);
return stream_update_dep_queue_top(stream, session);
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}
int nghttp2_stream_dep_add_subtree(nghttp2_stream *dep_stream,
nghttp2_stream *stream,
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nghttp2_session *session) {
nghttp2_stream *blocking_stream;
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DEBUGF(fprintf(stderr, "stream: dep_add_subtree dep_stream(%p)=%d "
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"stream(%p)=%d\n",
dep_stream, dep_stream->stream_id, stream, stream->stream_id));
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if (dep_stream->dep_next) {
dep_stream->sum_dep_weight += stream->weight;
insert_link_dep(dep_stream, stream);
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} else {
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link_dep(dep_stream, stream);
assert(dep_stream->sum_dep_weight == 0);
dep_stream->sum_dep_weight = stream->weight;
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}
stream_update_dep_length(dep_stream, stream->num_substreams);
blocking_stream = stream_get_dep_blocking(dep_stream);
if (blocking_stream) {
/* We cannot make any assumption for stream if its dpri is not
NGHTTP2_DPRI_TOP. Just dfs under stream here. */
stream_update_dep_set_rest(stream);
return 0;
}
if (stream->dpri == NGHTTP2_STREAM_DPRI_TOP) {
stream_update_dep_sum_norest_weight(dep_stream, stream->weight);
return 0;
}
if (stream_update_dep_set_top(stream) == 0) {
return 0;
}
/* Newly added subtree contributes to dep_stream's
sum_norest_weight */
stream_update_dep_sum_norest_weight(dep_stream, stream->weight);
return stream_update_dep_queue_top(stream, session);
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}
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void nghttp2_stream_dep_remove_subtree(nghttp2_stream *stream) {
nghttp2_stream *next, *dep_prev, *blocking_stream;
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DEBUGF(fprintf(stderr, "stream: dep_remove_subtree stream(%p)=%d\n", stream,
stream->stream_id));
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if (stream->sib_prev) {
link_sib(stream->sib_prev, stream->sib_next);
dep_prev = stream->dep_prev;
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} else if (stream->dep_prev) {
dep_prev = stream->dep_prev;
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next = stream->sib_next;
link_dep(dep_prev, next);
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if (next) {
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next->sib_prev = NULL;
}
} else {
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nghttp2_stream_roots_remove(stream->roots, stream);
dep_prev = NULL;
}
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if (dep_prev) {
dep_prev->sum_dep_weight -= stream->weight;
stream_update_dep_length(dep_prev, -stream->num_substreams);
blocking_stream = stream_get_dep_blocking(dep_prev);
if (!blocking_stream && (stream->dpri == NGHTTP2_STREAM_DPRI_TOP ||
(stream->dpri == NGHTTP2_STREAM_DPRI_NO_ITEM &&
stream->sum_norest_weight))) {
stream_update_dep_sum_norest_weight(dep_prev, -stream->weight);
}
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}
stream->sib_prev = NULL;
stream->sib_next = NULL;
stream->dep_prev = NULL;
}
int nghttp2_stream_dep_make_root(nghttp2_stream *stream,
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nghttp2_session *session) {
DEBUGF(fprintf(stderr, "stream: dep_make_root stream(%p)=%d\n", stream,
stream->stream_id));
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nghttp2_stream_roots_add(stream->roots, stream);
if (stream_update_dep_set_top(stream) == 0) {
return 0;
}
return stream_update_dep_queue_top(stream, session);
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}
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int
nghttp2_stream_dep_all_your_stream_are_belong_to_us(nghttp2_stream *stream,
nghttp2_session *session) {
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nghttp2_stream *first, *si;
DEBUGF(fprintf(stderr, "stream: ALL YOUR STREAM ARE BELONG TO US "
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"stream(%p)=%d\n",
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stream, stream->stream_id));
first = stream->roots->head;
/* stream must not be include in stream->roots->head list */
assert(first != stream);
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if (first) {
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nghttp2_stream *prev;
prev = first;
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DEBUGF(fprintf(stderr, "stream: root stream(%p)=%d\n", first,
first->stream_id));
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stream->sum_dep_weight += first->weight;
stream->num_substreams += first->num_substreams;
if (stream->dpri != NGHTTP2_STREAM_DPRI_NO_ITEM &&
(first->dpri == NGHTTP2_STREAM_DPRI_TOP ||
(first->dpri == NGHTTP2_STREAM_DPRI_NO_ITEM &&
first->sum_norest_weight))) {
stream_update_dep_set_rest(first);
}
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for (si = first->root_next; si; si = si->root_next) {
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assert(si != stream);
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DEBUGF(
fprintf(stderr, "stream: root stream(%p)=%d\n", si, si->stream_id));
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stream->sum_dep_weight += si->weight;
stream->num_substreams += si->num_substreams;
if (stream->dpri != NGHTTP2_STREAM_DPRI_NO_ITEM &&
(si->dpri == NGHTTP2_STREAM_DPRI_TOP ||
(si->dpri == NGHTTP2_STREAM_DPRI_NO_ITEM &&
si->sum_norest_weight))) {
stream_update_dep_set_rest(si);
}
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link_sib(prev, si);
si->dep_prev = stream;
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prev = si;
}
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if (stream->dep_next) {
nghttp2_stream *sib_next;
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sib_next = stream->dep_next;
first->dep_prev = stream;
link_sib(first, sib_next);
link_dep(stream, prev);
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} else {
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link_dep(stream, first);
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}
}
nghttp2_stream_roots_remove_all(stream->roots);
return nghttp2_stream_dep_make_root(stream, session);
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}
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int nghttp2_stream_in_dep_tree(nghttp2_stream *stream) {
return stream->dep_prev || stream->dep_next || stream->sib_prev ||
stream->sib_next || stream->root_next || stream->root_prev ||
stream->roots->head == stream;
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}
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void nghttp2_stream_roots_init(nghttp2_stream_roots *roots) {
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roots->head = NULL;
roots->num_streams = 0;
}
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void nghttp2_stream_roots_free(nghttp2_stream_roots *roots _U_) {}
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void nghttp2_stream_roots_add(nghttp2_stream_roots *roots,
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nghttp2_stream *stream) {
if (roots->head) {
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stream->root_next = roots->head;
roots->head->root_prev = stream;
}
roots->head = stream;
}
void nghttp2_stream_roots_remove(nghttp2_stream_roots *roots,
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nghttp2_stream *stream) {
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nghttp2_stream *root_prev, *root_next;
root_prev = stream->root_prev;
root_next = stream->root_next;
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if (root_prev) {
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root_prev->root_next = root_next;
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if (root_next) {
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root_next->root_prev = root_prev;
}
} else {
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if (root_next) {
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root_next->root_prev = NULL;
}
roots->head = root_next;
}
stream->root_prev = NULL;
stream->root_next = NULL;
}
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void nghttp2_stream_roots_remove_all(nghttp2_stream_roots *roots) {
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nghttp2_stream *si, *next;
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for (si = roots->head; si;) {
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next = si->root_next;
si->root_prev = NULL;
si->root_next = NULL;
si = next;
}
roots->head = NULL;
}