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/*
* Copyright 2018 The Android Open Source Project
*
* 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 "message_loop_thread.h"
#include <base/functional/callback.h>
#include <base/location.h>
#include <base/time/time.h>
#include <bluetooth/log.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <future>
#include <mutex>
#include <string>
#include <thread>
#include "common/postable_context.h"
namespace bluetooth {
namespace common {
static constexpr int kRealTimeFifoSchedulingPriority = 1;
static base::TimeDelta timeDeltaFromMicroseconds(std::chrono::microseconds t) {
#if BASE_VER < 931007
return base::TimeDelta::FromMicroseconds(t.count());
#else
return base::Microseconds(t.count());
#endif
}
MessageLoopThread::MessageLoopThread(const std::string& thread_name)
: thread_name_(thread_name),
message_loop_(nullptr),
run_loop_(nullptr),
thread_(nullptr),
thread_id_(-1),
linux_tid_(-1),
weak_ptr_factory_(this),
shutting_down_(false) {}
MessageLoopThread::~MessageLoopThread() { ShutDown(); }
void MessageLoopThread::StartUp() {
std::promise<void> start_up_promise;
std::future<void> start_up_future = start_up_promise.get_future();
{
std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
if (thread_ != nullptr) {
log::warn("thread {} is already started", *this);
return;
}
thread_ = new std::thread(&MessageLoopThread::RunThread, this, std::move(start_up_promise));
}
start_up_future.wait();
}
bool MessageLoopThread::DoInThread(base::OnceClosure task) {
return DoInThreadDelayed(std::move(task), std::chrono::microseconds(0));
}
bool MessageLoopThread::DoInThreadDelayed(base::OnceClosure task, std::chrono::microseconds delay) {
std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
if (message_loop_ == nullptr) {
log::error("message loop is null for thread {}", *this);
return false;
}
if (!message_loop_->task_runner()->PostDelayedTask(FROM_HERE, std::move(task),
timeDeltaFromMicroseconds(delay))) {
log::error("failed to post task to message loop for thread {}", *this);
return false;
}
return true;
}
void MessageLoopThread::ShutDown() {
{
std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
if (thread_ == nullptr) {
log::info("thread {} is already stopped", *this);
return;
}
if (message_loop_ == nullptr) {
log::info("message_loop_ is null. Already stopping");
return;
}
if (shutting_down_) {
log::info("waiting for thread to join");
return;
}
shutting_down_ = true;
log::assert_that(thread_id_ != base::PlatformThread::CurrentId(),
"should not be called on the thread itself. Otherwise, deadlock may happen.");
run_loop_->QuitWhenIdle();
}
thread_->join();
{
std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
delete thread_;
thread_ = nullptr;
shutting_down_ = false;
}
}
base::PlatformThreadId MessageLoopThread::GetThreadId() const {
std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
return thread_id_;
}
std::string MessageLoopThread::GetName() const { return thread_name_; }
std::string MessageLoopThread::ToString() const {
std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
return std::format("{}({})", thread_name_, thread_id_);
}
bool MessageLoopThread::IsRunning() const {
std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
return thread_id_ != -1;
}
// Non API method, should not be protected by API mutex
void MessageLoopThread::RunThread(MessageLoopThread* thread, std::promise<void> start_up_promise) {
thread->Run(std::move(start_up_promise));
}
// This is only for use in tests.
btbase::AbstractMessageLoop* MessageLoopThread::message_loop() const {
std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
return message_loop_;
}
bool MessageLoopThread::EnableRealTimeScheduling() {
std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
if (!IsRunning()) {
log::error("thread {} is not running", *this);
return false;
}
struct sched_param rt_params = {.sched_priority = kRealTimeFifoSchedulingPriority};
int rc = sched_setscheduler(linux_tid_, SCHED_FIFO, &rt_params);
if (rc != 0) {
log::error("unable to set SCHED_FIFO priority {} for linux_tid {}, thread {}, error: {}",
kRealTimeFifoSchedulingPriority, linux_tid_, *this, strerror(errno));
return false;
}
return true;
}
base::WeakPtr<MessageLoopThread> MessageLoopThread::GetWeakPtr() {
std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
return weak_ptr_factory_.GetWeakPtr();
}
void MessageLoopThread::Run(std::promise<void> start_up_promise) {
{
std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
log::info("message loop starting for thread {}", thread_name_);
base::PlatformThread::SetName(thread_name_);
message_loop_ = new btbase::AbstractMessageLoop();
run_loop_ = new base::RunLoop();
thread_id_ = base::PlatformThread::CurrentId();
linux_tid_ = static_cast<pid_t>(syscall(SYS_gettid));
start_up_promise.set_value();
}
// Blocking until ShutDown() is called
run_loop_->Run();
{
std::lock_guard<std::recursive_mutex> api_lock(api_mutex_);
thread_id_ = -1;
linux_tid_ = -1;
delete message_loop_;
message_loop_ = nullptr;
delete run_loop_;
run_loop_ = nullptr;
log::info("message loop finished for thread {}", thread_name_);
}
}
void MessageLoopThread::Post(base::OnceClosure closure) { DoInThread(std::move(closure)); }
PostableContext* MessageLoopThread::Postable() { return this; }
} // namespace common
} // namespace bluetooth
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