102 lines
3.5 KiB
C++
102 lines
3.5 KiB
C++
/*
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* Copyright 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "l2cap/internal/scheduler_fifo.h"
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#include "dynamic_channel_impl.h"
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#include "l2cap/internal/data_pipeline_manager.h"
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#include "l2cap/l2cap_packets.h"
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#include "os/log.h"
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namespace bluetooth {
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namespace l2cap {
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namespace internal {
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Fifo::Fifo(DataPipelineManager* data_pipeline_manager, LowerQueueUpEnd* link_queue_up_end, os::Handler* handler)
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: data_pipeline_manager_(data_pipeline_manager), link_queue_up_end_(link_queue_up_end), handler_(handler) {
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ASSERT(link_queue_up_end_ != nullptr && handler_ != nullptr);
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}
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// Invoked from some external Handler context
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Fifo::~Fifo() {
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// TODO(hsz): notify Sender don't send callback to me
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if (link_queue_enqueue_registered_.exchange(false)) {
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link_queue_up_end_->UnregisterEnqueue();
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}
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}
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// Invoked within L2CAP Handler context
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void Fifo::OnPacketsReady(Cid cid, int number_packets) {
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if (number_packets == 0) {
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return;
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}
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int priority = high_priority_cids_.count(cid) != 0;
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next_to_dequeue_and_num_packets.push(std::make_pair(cid, number_packets), priority);
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try_register_link_queue_enqueue();
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}
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// Invoked within L2CAP Handler context
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void Fifo::SetChannelTxPriority(Cid cid, bool high_priority) {
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if (high_priority) {
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high_priority_cids_.emplace(cid);
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} else {
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high_priority_cids_.erase(cid);
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}
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}
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void Fifo::RemoveChannel(Cid cid) {
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for (size_t i = 0; i < next_to_dequeue_and_num_packets.size(); i++) {
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auto& channel_id_and_number_packets = next_to_dequeue_and_num_packets.front();
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if (channel_id_and_number_packets.second != cid) {
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next_to_dequeue_and_num_packets.push(channel_id_and_number_packets);
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}
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next_to_dequeue_and_num_packets.pop();
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}
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if (next_to_dequeue_and_num_packets.empty() && link_queue_enqueue_registered_.exchange(false)) {
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link_queue_up_end_->UnregisterEnqueue();
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}
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}
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// Invoked from some external Queue Reactable context
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std::unique_ptr<Fifo::UpperDequeue> Fifo::link_queue_enqueue_callback() {
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ASSERT(!next_to_dequeue_and_num_packets.empty());
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auto& channel_id_and_number_packets = next_to_dequeue_and_num_packets.front();
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auto channel_id = channel_id_and_number_packets.first;
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channel_id_and_number_packets.second--;
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if (channel_id_and_number_packets.second == 0) {
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next_to_dequeue_and_num_packets.pop();
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}
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auto packet = data_pipeline_manager_->GetDataController(channel_id)->GetNextPacket();
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data_pipeline_manager_->OnPacketSent(channel_id);
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if (next_to_dequeue_and_num_packets.empty() && link_queue_enqueue_registered_.exchange(false)) {
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link_queue_up_end_->UnregisterEnqueue();
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}
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return packet;
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}
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void Fifo::try_register_link_queue_enqueue() {
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if (link_queue_enqueue_registered_.exchange(true)) {
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return;
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}
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link_queue_up_end_->RegisterEnqueue(handler_,
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common::Bind(&Fifo::link_queue_enqueue_callback, common::Unretained(this)));
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}
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} // namespace internal
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} // namespace l2cap
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} // namespace bluetooth
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