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/*
* nghttp3
*
* Copyright (c) 2019 nghttp3 contributors
*
* 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.
*/
#include "nghttp3_tnode.h"
#include <assert.h>
#include "nghttp3_macro.h"
#include "nghttp3_stream.h"
#include "nghttp3_conn.h"
#include "nghttp3_conv.h"
nghttp3_node_id *nghttp3_node_id_init(nghttp3_node_id *nid,
nghttp3_node_id_type type, int64_t id) {
nid->type = type;
nid->id = id;
return nid;
}
int nghttp3_node_id_eq(const nghttp3_node_id *a, const nghttp3_node_id *b) {
return a->type == b->type && a->id == b->id;
}
void nghttp3_tnode_init(nghttp3_tnode *tnode, const nghttp3_node_id *nid,
uint64_t seq, uint8_t pri) {
assert(nghttp3_pri_uint8_urgency(pri) < NGHTTP3_URGENCY_LEVELS);
tnode->pe.index = NGHTTP3_PQ_BAD_INDEX;
tnode->nid = *nid;
tnode->seq = seq;
tnode->cycle = 0;
tnode->pri = pri;
}
void nghttp3_tnode_free(nghttp3_tnode *tnode) { (void)tnode; }
static void tnode_unschedule(nghttp3_tnode *tnode, nghttp3_pq *pq) {
assert(tnode->pe.index != NGHTTP3_PQ_BAD_INDEX);
nghttp3_pq_remove(pq, &tnode->pe);
tnode->pe.index = NGHTTP3_PQ_BAD_INDEX;
}
void nghttp3_tnode_unschedule(nghttp3_tnode *tnode, nghttp3_pq *pq) {
if (tnode->pe.index == NGHTTP3_PQ_BAD_INDEX) {
return;
}
tnode_unschedule(tnode, pq);
}
static uint64_t pq_get_first_cycle(nghttp3_pq *pq) {
nghttp3_tnode *top;
if (nghttp3_pq_empty(pq)) {
return 0;
}
top = nghttp3_struct_of(nghttp3_pq_top(pq), nghttp3_tnode, pe);
return top->cycle;
}
int nghttp3_tnode_schedule(nghttp3_tnode *tnode, nghttp3_pq *pq,
uint64_t nwrite) {
uint64_t penalty = nwrite / NGHTTP3_STREAM_MIN_WRITELEN;
if (tnode->pe.index == NGHTTP3_PQ_BAD_INDEX) {
tnode->cycle = pq_get_first_cycle(pq) +
((nwrite == 0 || !nghttp3_pri_uint8_inc(tnode->pri))
? 0
: nghttp3_max(1, penalty));
} else if (nwrite > 0) {
if (!nghttp3_pri_uint8_inc(tnode->pri) || nghttp3_pq_size(pq) == 1) {
return 0;
}
nghttp3_pq_remove(pq, &tnode->pe);
tnode->pe.index = NGHTTP3_PQ_BAD_INDEX;
tnode->cycle += nghttp3_max(1, penalty);
} else {
return 0;
}
return nghttp3_pq_push(pq, &tnode->pe);
}
int nghttp3_tnode_is_scheduled(nghttp3_tnode *tnode) {
return tnode->pe.index != NGHTTP3_PQ_BAD_INDEX;
}
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