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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <grpc/support/port_platform.h>
#include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
#include "src/core/ext/transport/chttp2/transport/internal.h"
#include <grpc/support/log.h>
static const char* stream_list_id_string(grpc_chttp2_stream_list_id id) {
switch (id) {
case GRPC_CHTTP2_LIST_WRITABLE:
return "writable";
case GRPC_CHTTP2_LIST_WRITING:
return "writing";
case GRPC_CHTTP2_LIST_STALLED_BY_TRANSPORT:
return "stalled_by_transport";
case GRPC_CHTTP2_LIST_STALLED_BY_STREAM:
return "stalled_by_stream";
case GRPC_CHTTP2_LIST_WAITING_FOR_CONCURRENCY:
return "waiting_for_concurrency";
case STREAM_LIST_COUNT:
GPR_UNREACHABLE_CODE(return "unknown");
}
GPR_UNREACHABLE_CODE(return "unknown");
}
grpc_core::TraceFlag grpc_trace_http2_stream_state(false, "http2_stream_state");
/* core list management */
static bool stream_list_empty(grpc_chttp2_transport* t,
grpc_chttp2_stream_list_id id) {
return t->lists[id].head == nullptr;
}
static bool stream_list_pop(grpc_chttp2_transport* t,
grpc_chttp2_stream** stream,
grpc_chttp2_stream_list_id id) {
grpc_chttp2_stream* s = t->lists[id].head;
if (s) {
grpc_chttp2_stream* new_head = s->links[id].next;
GPR_ASSERT(s->included[id]);
if (new_head) {
t->lists[id].head = new_head;
new_head->links[id].prev = nullptr;
} else {
t->lists[id].head = nullptr;
t->lists[id].tail = nullptr;
}
s->included[id] = 0;
}
*stream = s;
if (s && grpc_trace_http2_stream_state.enabled()) {
gpr_log(GPR_INFO, "%p[%d][%s]: pop from %s", t, s->id,
t->is_client ? "cli" : "svr", stream_list_id_string(id));
}
return s != nullptr;
}
static void stream_list_remove(grpc_chttp2_transport* t, grpc_chttp2_stream* s,
grpc_chttp2_stream_list_id id) {
GPR_ASSERT(s->included[id]);
s->included[id] = 0;
if (s->links[id].prev) {
s->links[id].prev->links[id].next = s->links[id].next;
} else {
GPR_ASSERT(t->lists[id].head == s);
t->lists[id].head = s->links[id].next;
}
if (s->links[id].next) {
s->links[id].next->links[id].prev = s->links[id].prev;
} else {
t->lists[id].tail = s->links[id].prev;
}
if (grpc_trace_http2_stream_state.enabled()) {
gpr_log(GPR_INFO, "%p[%d][%s]: remove from %s", t, s->id,
t->is_client ? "cli" : "svr", stream_list_id_string(id));
}
}
static bool stream_list_maybe_remove(grpc_chttp2_transport* t,
grpc_chttp2_stream* s,
grpc_chttp2_stream_list_id id) {
if (s->included[id]) {
stream_list_remove(t, s, id);
return true;
} else {
return false;
}
}
static void stream_list_add_tail(grpc_chttp2_transport* t,
grpc_chttp2_stream* s,
grpc_chttp2_stream_list_id id) {
grpc_chttp2_stream* old_tail;
GPR_ASSERT(!s->included[id]);
old_tail = t->lists[id].tail;
s->links[id].next = nullptr;
s->links[id].prev = old_tail;
if (old_tail) {
old_tail->links[id].next = s;
} else {
t->lists[id].head = s;
}
t->lists[id].tail = s;
s->included[id] = 1;
if (grpc_trace_http2_stream_state.enabled()) {
gpr_log(GPR_INFO, "%p[%d][%s]: add to %s", t, s->id,
t->is_client ? "cli" : "svr", stream_list_id_string(id));
}
}
static bool stream_list_add(grpc_chttp2_transport* t, grpc_chttp2_stream* s,
grpc_chttp2_stream_list_id id) {
if (s->included[id]) {
return false;
}
stream_list_add_tail(t, s, id);
return true;
}
/* wrappers for specializations */
bool grpc_chttp2_list_add_writable_stream(grpc_chttp2_transport* t,
grpc_chttp2_stream* s) {
GPR_ASSERT(s->id != 0);
return stream_list_add(t, s, GRPC_CHTTP2_LIST_WRITABLE);
}
bool grpc_chttp2_list_pop_writable_stream(grpc_chttp2_transport* t,
grpc_chttp2_stream** s) {
return stream_list_pop(t, s, GRPC_CHTTP2_LIST_WRITABLE);
}
bool grpc_chttp2_list_remove_writable_stream(grpc_chttp2_transport* t,
grpc_chttp2_stream* s) {
return stream_list_maybe_remove(t, s, GRPC_CHTTP2_LIST_WRITABLE);
}
bool grpc_chttp2_list_add_writing_stream(grpc_chttp2_transport* t,
grpc_chttp2_stream* s) {
return stream_list_add(t, s, GRPC_CHTTP2_LIST_WRITING);
}
bool grpc_chttp2_list_have_writing_streams(grpc_chttp2_transport* t) {
return !stream_list_empty(t, GRPC_CHTTP2_LIST_WRITING);
}
bool grpc_chttp2_list_pop_writing_stream(grpc_chttp2_transport* t,
grpc_chttp2_stream** s) {
return stream_list_pop(t, s, GRPC_CHTTP2_LIST_WRITING);
}
void grpc_chttp2_list_add_waiting_for_concurrency(grpc_chttp2_transport* t,
grpc_chttp2_stream* s) {
stream_list_add(t, s, GRPC_CHTTP2_LIST_WAITING_FOR_CONCURRENCY);
}
bool grpc_chttp2_list_pop_waiting_for_concurrency(grpc_chttp2_transport* t,
grpc_chttp2_stream** s) {
return stream_list_pop(t, s, GRPC_CHTTP2_LIST_WAITING_FOR_CONCURRENCY);
}
void grpc_chttp2_list_remove_waiting_for_concurrency(grpc_chttp2_transport* t,
grpc_chttp2_stream* s) {
stream_list_maybe_remove(t, s, GRPC_CHTTP2_LIST_WAITING_FOR_CONCURRENCY);
}
void grpc_chttp2_list_add_stalled_by_transport(grpc_chttp2_transport* t,
grpc_chttp2_stream* s) {
GPR_ASSERT(t->flow_control->flow_control_enabled());
stream_list_add(t, s, GRPC_CHTTP2_LIST_STALLED_BY_TRANSPORT);
}
bool grpc_chttp2_list_pop_stalled_by_transport(grpc_chttp2_transport* t,
grpc_chttp2_stream** s) {
return stream_list_pop(t, s, GRPC_CHTTP2_LIST_STALLED_BY_TRANSPORT);
}
void grpc_chttp2_list_remove_stalled_by_transport(grpc_chttp2_transport* t,
grpc_chttp2_stream* s) {
stream_list_maybe_remove(t, s, GRPC_CHTTP2_LIST_STALLED_BY_TRANSPORT);
}
void grpc_chttp2_list_add_stalled_by_stream(grpc_chttp2_transport* t,
grpc_chttp2_stream* s) {
GPR_ASSERT(t->flow_control->flow_control_enabled());
stream_list_add(t, s, GRPC_CHTTP2_LIST_STALLED_BY_STREAM);
}
bool grpc_chttp2_list_pop_stalled_by_stream(grpc_chttp2_transport* t,
grpc_chttp2_stream** s) {
return stream_list_pop(t, s, GRPC_CHTTP2_LIST_STALLED_BY_STREAM);
}
bool grpc_chttp2_list_remove_stalled_by_stream(grpc_chttp2_transport* t,
grpc_chttp2_stream* s) {
return stream_list_maybe_remove(t, s, GRPC_CHTTP2_LIST_STALLED_BY_STREAM);
}
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