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/*
* Copyright (C) 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 <pthread.h>
#include <stdlib.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>
#include <condition_variable>
#include <thread>
#include "perfetto/base/file_utils.h"
#include "perfetto/base/string_splitter.h"
#include "perfetto/base/time.h"
#include "test/task_runner_thread.h"
namespace perfetto {
TaskRunnerThread::TaskRunnerThread(const char* name) : name_(name) {}
TaskRunnerThread::~TaskRunnerThread() {
Stop();
}
void TaskRunnerThread::Start(std::unique_ptr<ThreadDelegate> delegate) {
// Begin holding the lock for the condition variable.
std::unique_lock<std::mutex> lock(mutex_);
// Start the thread.
PERFETTO_DCHECK(!runner_);
thread_ = std::thread(&TaskRunnerThread::Run, this, std::move(delegate));
// Wait for runner to be ready.
ready_.wait_for(lock, std::chrono::seconds(10),
[this]() { return runner_ != nullptr; });
}
void TaskRunnerThread::Stop() {
{
std::unique_lock<std::mutex> lock(mutex_);
if (runner_)
runner_->Quit();
}
if (thread_.joinable())
thread_.join();
}
uint64_t TaskRunnerThread::GetThreadCPUTimeNs() {
std::condition_variable cv;
std::unique_lock<std::mutex> lock(mutex_);
uint64_t thread_time_ns = 0;
if (!runner_)
return 0;
runner_->PostTask([this, &thread_time_ns, &cv] {
std::unique_lock<std::mutex> inner_lock(mutex_);
thread_time_ns = static_cast<uint64_t>(base::GetThreadCPUTimeNs().count());
cv.notify_one();
});
cv.wait(lock, [&thread_time_ns] { return thread_time_ns != 0; });
return thread_time_ns;
}
void TaskRunnerThread::Run(std::unique_ptr<ThreadDelegate> delegate) {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_MACOSX)
pthread_setname_np(name_);
#else
pthread_setname_np(pthread_self(), name_);
#endif
// Create the task runner and execute the specicalised code.
base::PlatformTaskRunner task_runner;
delegate->Initialize(&task_runner);
// Pass the runner back to the main thread.
{
std::unique_lock<std::mutex> lock(mutex_);
runner_ = &task_runner;
}
// Notify the main thread that the runner is ready.
ready_.notify_one();
// Spin the loop.
task_runner.Run();
// Ensure we clear out the delegate before runner goes out
// of scope.
delegate.reset();
// Cleanup the runner.
{
std::unique_lock<std::mutex> lock(mutex_);
runner_ = nullptr;
}
}
ThreadDelegate::~ThreadDelegate() = default;
} // namespace perfetto