1 /* 2 * Copyright 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "l2cap/internal/scheduler_fifo.h" 18 19 #include "dynamic_channel_impl.h" 20 #include "l2cap/internal/data_pipeline_manager.h" 21 #include "l2cap/l2cap_packets.h" 22 #include "os/log.h" 23 24 namespace bluetooth { 25 namespace l2cap { 26 namespace internal { 27 28 Fifo::Fifo(DataPipelineManager* data_pipeline_manager, LowerQueueUpEnd* link_queue_up_end, os::Handler* handler) 29 : data_pipeline_manager_(data_pipeline_manager), link_queue_up_end_(link_queue_up_end), handler_(handler) { 30 ASSERT(link_queue_up_end_ != nullptr && handler_ != nullptr); 31 } 32 33 Fifo::~Fifo() { 34 if (link_queue_enqueue_registered_) { 35 link_queue_up_end_->UnregisterEnqueue(); 36 } 37 } 38 39 void Fifo::OnPacketsReady(Cid cid, int number_packets) { 40 if (number_packets == 0) { 41 return; 42 } 43 next_to_dequeue_and_num_packets.push(std::make_pair(cid, number_packets)); 44 try_register_link_queue_enqueue(); 45 } 46 47 std::unique_ptr<Fifo::UpperDequeue> Fifo::link_queue_enqueue_callback() { 48 ASSERT(!next_to_dequeue_and_num_packets.empty()); 49 auto& channel_id_and_number_packets = next_to_dequeue_and_num_packets.front(); 50 auto channel_id = channel_id_and_number_packets.first; 51 channel_id_and_number_packets.second--; 52 if (channel_id_and_number_packets.second == 0) { 53 next_to_dequeue_and_num_packets.pop(); 54 } 55 auto packet = data_pipeline_manager_->GetDataController(channel_id)->GetNextPacket(); 56 57 data_pipeline_manager_->OnPacketSent(channel_id); 58 if (next_to_dequeue_and_num_packets.empty()) { 59 link_queue_up_end_->UnregisterEnqueue(); 60 link_queue_enqueue_registered_ = false; 61 } 62 return packet; 63 } 64 65 void Fifo::try_register_link_queue_enqueue() { 66 if (link_queue_enqueue_registered_) { 67 return; 68 } 69 link_queue_up_end_->RegisterEnqueue(handler_, 70 common::Bind(&Fifo::link_queue_enqueue_callback, common::Unretained(this))); 71 link_queue_enqueue_registered_ = true; 72 } 73 74 } // namespace internal 75 } // namespace l2cap 76 } // namespace bluetooth 77