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->effective_weight = stream->weight;
stream->sum_dep_weight = 0;
stream->sum_norest_weight = 0;
stream->sum_top_weight = 0;
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stream->roots = roots;
stream->root_prev = NULL;
stream->root_next = NULL;
}
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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) {
int rv;
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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if (item->weight > stream->effective_weight) {
item->weight = stream->effective_weight;
}
item->cycle = session->last_cycle;
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switch (item->frame.hd.type) {
case NGHTTP2_DATA:
rv = nghttp2_pq_push(&session->ob_da_pq, item);
break;
case NGHTTP2_HEADERS:
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if (stream->state == NGHTTP2_STREAM_RESERVED) {
rv = nghttp2_pq_push(&session->ob_ss_pq, item);
} else {
rv = nghttp2_pq_push(&session->ob_pq, item);
}
break;
default:
/* should not reach here */
assert(0);
}
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if (rv != 0) {
return rv;
}
item->queued = 1;
return 0;
}
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static nghttp2_stream *stream_first_sib(nghttp2_stream *stream) {
for (; stream->sib_prev; stream = stream->sib_prev)
;
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return stream;
}
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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;
}
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static nghttp2_stream *stream_update_dep_length(nghttp2_stream *stream,
ssize_t delta) {
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stream->num_substreams += delta;
stream = stream_first_sib(stream);
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if (stream->dep_prev) {
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return stream_update_dep_length(stream->dep_prev, delta);
}
return stream;
}
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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int32_t nghttp2_stream_dep_distributed_effective_weight(nghttp2_stream *stream,
int32_t weight) {
if (stream->sum_norest_weight == 0) {
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return stream->effective_weight;
}
weight = stream->effective_weight * weight / stream->sum_norest_weight;
return nghttp2_max(1, weight);
}
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static int32_t
stream_dep_distributed_top_effective_weight(nghttp2_stream *stream,
int32_t weight) {
if (stream->sum_top_weight == 0) {
return stream->effective_weight;
}
weight = stream->effective_weight * weight / stream->sum_top_weight;
return nghttp2_max(1, weight);
}
static void stream_update_dep_set_rest(nghttp2_stream *stream);
/* Updates effective_weight of descendant streams in subtree of
|stream|. We assume that stream->effective_weight is already set
right. */
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static void stream_update_dep_effective_weight(nghttp2_stream *stream) {
nghttp2_stream *si;
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DEBUGF(fprintf(stderr, "stream: update_dep_effective_weight "
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"stream(%p)=%d, weight=%d, sum_norest_weight=%d, "
"sum_top_weight=%d\n",
stream, stream->stream_id, stream->weight,
stream->sum_norest_weight, stream->sum_top_weight));
/* stream->sum_norest_weight == 0 means there is no
NGHTTP2_STREAM_DPRI_TOP under stream */
if (stream->dpri != NGHTTP2_STREAM_DPRI_NO_ITEM ||
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stream->sum_norest_weight == 0) {
return;
}
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/* If there is no direct descendant whose dpri is
NGHTTP2_STREAM_DPRI_TOP, indirect descendants have the chance to
send data, so recursively set weight for descendants. */
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if (stream->sum_top_weight == 0) {
for (si = stream->dep_next; si; si = si->sib_next) {
if (si->dpri != NGHTTP2_STREAM_DPRI_REST) {
si->effective_weight =
nghttp2_stream_dep_distributed_effective_weight(stream, si->weight);
}
stream_update_dep_effective_weight(si);
}
return;
}
/* If there is at least one direct descendant whose dpri is
NGHTTP2_STREAM_DPRI_TOP, we won't give a chance to indirect
descendants, since closed or blocked stream's weight is
distributed among its siblings */
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for (si = stream->dep_next; si; si = si->sib_next) {
if (si->dpri == NGHTTP2_STREAM_DPRI_TOP) {
si->effective_weight =
stream_dep_distributed_top_effective_weight(stream, si->weight);
DEBUGF(fprintf(stderr, "stream: stream=%d top eweight=%d\n",
si->stream_id, si->effective_weight));
continue;
}
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if (si->dpri == NGHTTP2_STREAM_DPRI_NO_ITEM) {
DEBUGF(fprintf(stderr, "stream: stream=%d no_item, ignored\n",
si->stream_id));
/* Since we marked NGHTTP2_STREAM_DPRI_TOP under si, we make
them NGHTTP2_STREAM_DPRI_REST again. */
stream_update_dep_set_rest(si->dep_next);
} else {
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DEBUGF(
fprintf(stderr, "stream: stream=%d rest, ignored\n", si->stream_id));
}
}
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}
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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.
*/
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static void stream_update_dep_set_top(nghttp2_stream *stream) {
nghttp2_stream *si;
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if (stream->dpri == NGHTTP2_STREAM_DPRI_TOP) {
return;
}
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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;
}
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for (si = stream->dep_next; si; si = si->sib_next) {
stream_update_dep_set_top(si);
}
}
/*
* 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;
}
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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 and stream->sum_top_weight
* recursively. We have to gather effective sum of weight of
* descendants. If stream->dpri == NGHTTP2_STREAM_DPRI_NO_ITEM, we
* have to go deeper and check that any of its descendants has dpri
* value of NGHTTP2_STREAM_DPRI_TOP. If so, we have to add weight of
* its direct descendants to stream->sum_norest_weight. To make this
* work, this function returns 1 if any of its descendants has dpri
* value of NGHTTP2_STREAM_DPRI_TOP, otherwise 0.
*
* Calculating stream->sum_top-weight is very simple compared to
* stream->sum_norest_weight. It just adds up the weight of direct
* descendants whose dpri is NGHTTP2_STREAM_DPRI_TOP.
*/
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static int stream_update_dep_sum_norest_weight(nghttp2_stream *stream) {
nghttp2_stream *si;
int rv;
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stream->sum_norest_weight = 0;
stream->sum_top_weight = 0;
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if (stream->dpri == NGHTTP2_STREAM_DPRI_TOP) {
return 1;
}
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if (stream->dpri == NGHTTP2_STREAM_DPRI_REST) {
return 0;
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}
rv = 0;
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for (si = stream->dep_next; si; si = si->sib_next) {
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if (stream_update_dep_sum_norest_weight(si)) {
rv = 1;
stream->sum_norest_weight += si->weight;
}
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if (si->dpri == NGHTTP2_STREAM_DPRI_TOP) {
stream->sum_top_weight += si->weight;
}
}
return rv;
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}
static int stream_update_dep_on_attach_item(nghttp2_stream *stream,
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nghttp2_session *session) {
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nghttp2_stream *root_stream;
stream->dpri = NGHTTP2_STREAM_DPRI_REST;
stream_update_dep_set_rest(stream->dep_next);
root_stream = nghttp2_stream_get_dep_root(stream);
DEBUGF(fprintf(stderr, "root=%p, stream=%p\n", root_stream, stream));
stream_update_dep_set_top(root_stream);
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stream_update_dep_sum_norest_weight(root_stream);
stream_update_dep_effective_weight(root_stream);
return stream_update_dep_queue_top(root_stream, session);
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}
static int stream_update_dep_on_detach_item(nghttp2_stream *stream,
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nghttp2_session *session) {
nghttp2_stream *root_stream;
stream->dpri = NGHTTP2_STREAM_DPRI_NO_ITEM;
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root_stream = nghttp2_stream_get_dep_root(stream);
stream_update_dep_set_top(root_stream);
stream_update_dep_sum_norest_weight(root_stream);
stream_update_dep_effective_weight(root_stream);
return stream_update_dep_queue_top(root_stream, 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 (;;) {
if (stream->sib_prev) {
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stream = stream->sib_prev;
continue;
}
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if (stream->dep_prev) {
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stream = stream->dep_prev;
continue;
}
break;
}
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);
}
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 *root_stream;
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assert(stream->item == NULL);
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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;
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if (dep_stream->dep_next) {
for (si = dep_stream->dep_next; si; si = si->sib_next) {
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stream->num_substreams += si->num_substreams;
}
stream->dep_next = dep_stream->dep_next;
stream->dep_next->dep_prev = stream;
}
dep_stream->dep_next = stream;
stream->dep_prev = dep_stream;
root_stream = stream_update_dep_length(dep_stream, 1);
stream_update_dep_sum_norest_weight(root_stream);
stream_update_dep_effective_weight(root_stream);
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++stream->roots->num_streams;
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}
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static void link_dep(nghttp2_stream *dep_stream, nghttp2_stream *stream) {
dep_stream->dep_next = stream;
stream->dep_prev = dep_stream;
}
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static void link_sib(nghttp2_stream *prev_stream, nghttp2_stream *stream) {
prev_stream->sib_next = stream;
stream->sib_prev = prev_stream;
}
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);
sib_next->dep_prev = NULL;
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
*/
dep_next->dep_prev = NULL;
link_sib(prev, dep_next);
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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);
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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) {
nghttp2_stream *root_stream;
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assert(stream->item == NULL);
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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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root_stream = 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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}
stream_update_dep_sum_norest_weight(root_stream);
stream_update_dep_effective_weight(root_stream);
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++stream->roots->num_streams;
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}
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void nghttp2_stream_dep_remove(nghttp2_stream *stream) {
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nghttp2_stream *prev, *next, *dep_prev, *si, *root_stream;
int32_t sum_dep_weight_delta;
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root_stream = NULL;
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DEBUGF(fprintf(stderr, "stream: dep_remove stream(%p)=%d\n", stream,
stream->stream_id));
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/* Distribute weight of |stream| to direct descendants */
sum_dep_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;
}
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prev = stream_first_sib(stream);
dep_prev = prev->dep_prev;
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if (dep_prev) {
root_stream = stream_update_dep_length(dep_prev, -1);
dep_prev->sum_dep_weight += sum_dep_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;
/* We already distributed weight of |stream| to this. */
si->effective_weight = si->weight;
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nghttp2_stream_roots_add(si->roots, si);
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si = next;
}
}
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if (root_stream) {
stream_update_dep_sum_norest_weight(root_stream);
stream_update_dep_effective_weight(root_stream);
}
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stream->num_substreams = 1;
stream->sum_dep_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 *root_stream;
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;
stream_update_dep_set_rest(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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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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dep_next->dep_prev = NULL;
} else {
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link_dep(stream, dep_next);
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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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}
root_stream = stream_update_dep_length(dep_stream, delta_substreams);
stream_update_dep_set_top(root_stream);
stream_update_dep_sum_norest_weight(root_stream);
stream_update_dep_effective_weight(root_stream);
return stream_update_dep_queue_top(root_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) {
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nghttp2_stream *root_stream;
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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stream_update_dep_set_rest(stream);
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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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}
root_stream = stream_update_dep_length(dep_stream, stream->num_substreams);
stream_update_dep_set_top(root_stream);
stream_update_dep_sum_norest_weight(root_stream);
stream_update_dep_effective_weight(root_stream);
return stream_update_dep_queue_top(root_stream, session);
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}
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void nghttp2_stream_dep_remove_subtree(nghttp2_stream *stream) {
nghttp2_stream *prev, *next, *dep_prev, *root_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) {
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prev = stream->sib_prev;
prev->sib_next = stream->sib_next;
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if (prev->sib_next) {
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prev->sib_next->sib_prev = prev;
}
prev = stream_first_sib(prev);
dep_prev = prev->dep_prev;
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} else if (stream->dep_prev) {
dep_prev = stream->dep_prev;
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next = stream->sib_next;
dep_prev->dep_next = next;
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if (next) {
next->dep_prev = dep_prev;
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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;
root_stream = stream_update_dep_length(dep_prev, -stream->num_substreams);
stream_update_dep_sum_norest_weight(root_stream);
stream_update_dep_effective_weight(root_stream);
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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);
stream_update_dep_set_rest(stream);
stream->effective_weight = stream->weight;
stream_update_dep_set_top(stream);
stream_update_dep_sum_norest_weight(stream);
stream_update_dep_effective_weight(stream);
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;
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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;
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link_sib(prev, si);
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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;
sib_next->dep_prev = NULL;
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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;
}