/*
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* Copyright 2018 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 "once_timer.h"
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#include "message_loop_thread.h"
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#include "time_util.h"
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namespace bluetooth {
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namespace common {
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// This runs on user thread
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OnceTimer::~OnceTimer() {
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std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
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if (message_loop_thread_ != nullptr && message_loop_thread_->IsRunning()) {
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CancelAndWait();
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}
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}
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// This runs on user thread
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bool OnceTimer::Schedule(const base::WeakPtr<MessageLoopThread>& thread,
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const base::Location& from_here,
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base::OnceClosure task, base::TimeDelta delay) {
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uint64_t time_now_us = time_get_os_boottime_us();
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uint64_t time_next_task_us = time_now_us + delay.InMicroseconds();
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std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
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if (thread == nullptr) {
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LOG(ERROR) << __func__ << ": thread must be non-null";
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return false;
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}
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CancelAndWait();
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task_ = std::move(task);
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task_wrapper_.Reset(
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base::BindOnce(&OnceTimer::RunTask, base::Unretained(this)));
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message_loop_thread_ = thread;
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delay_ = delay;
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uint64_t time_until_next_us = time_next_task_us - time_get_os_boottime_us();
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if (!thread->DoInThreadDelayed(
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from_here, task_wrapper_.callback(),
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base::TimeDelta::FromMicroseconds(time_until_next_us))) {
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LOG(ERROR) << __func__
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<< ": failed to post task to message loop for thread " << *thread
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<< ", from " << from_here.ToString();
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task_wrapper_.Cancel();
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message_loop_thread_ = nullptr;
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delay_ = {};
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return false;
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}
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return true;
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}
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// This runs on user thread
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void OnceTimer::Cancel() {
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std::promise<void> promise;
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CancelHelper(std::move(promise));
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}
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// This runs on user thread
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void OnceTimer::CancelAndWait() {
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std::promise<void> promise;
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auto future = promise.get_future();
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CancelHelper(std::move(promise));
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future.wait();
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}
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// This runs on user thread
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void OnceTimer::CancelHelper(std::promise<void> promise) {
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std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
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MessageLoopThread* scheduled_thread = message_loop_thread_.get();
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if (scheduled_thread == nullptr) {
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promise.set_value();
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return;
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}
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if (scheduled_thread->GetThreadId() == base::PlatformThread::CurrentId()) {
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CancelClosure(std::move(promise));
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return;
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}
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scheduled_thread->DoInThread(
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FROM_HERE, base::BindOnce(&OnceTimer::CancelClosure,
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base::Unretained(this), std::move(promise)));
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}
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// This runs on message loop thread
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void OnceTimer::CancelClosure(std::promise<void> promise) {
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message_loop_thread_ = nullptr;
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task_wrapper_.Cancel();
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std::move(task_);
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delay_ = base::TimeDelta();
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promise.set_value();
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}
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// This runs on user thread
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bool OnceTimer::IsScheduled() const {
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std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
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return message_loop_thread_ != nullptr && message_loop_thread_->IsRunning();
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}
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// This runs on message loop thread
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void OnceTimer::RunTask() {
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if (message_loop_thread_ == nullptr || !message_loop_thread_->IsRunning()) {
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LOG(ERROR) << __func__
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<< ": message_loop_thread_ is null or is not running";
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return;
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}
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CHECK_EQ(message_loop_thread_->GetThreadId(),
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base::PlatformThread::CurrentId())
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<< ": task must run on message loop thread";
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task_wrapper_.Cancel();
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std::move(task_).Run();
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message_loop_thread_ = nullptr;
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}
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} // namespace common
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} // namespace bluetooth
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