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/*
* Copyright (C) 2019 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 "perfetto/base/build_config.h"
#if !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
#include "perfetto/ext/base/thread_task_runner.h"
#include <condition_variable>
#include <functional>
#include <mutex>
#include <thread>
#include "perfetto/base/logging.h"
#include "perfetto/ext/base/thread_utils.h"
#include "perfetto/ext/base/unix_task_runner.h"
#if PERFETTO_BUILDFLAG(PERFETTO_OS_LINUX) || \
PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
#include <sys/prctl.h>
#endif
namespace perfetto {
namespace base {
ThreadTaskRunner::ThreadTaskRunner(ThreadTaskRunner&& other) noexcept
: thread_(std::move(other.thread_)), task_runner_(other.task_runner_) {
other.task_runner_ = nullptr;
}
ThreadTaskRunner& ThreadTaskRunner::operator=(ThreadTaskRunner&& other) {
this->~ThreadTaskRunner();
new (this) ThreadTaskRunner(std::move(other));
return *this;
}
ThreadTaskRunner::~ThreadTaskRunner() {
if (task_runner_) {
PERFETTO_CHECK(!task_runner_->QuitCalled());
task_runner_->Quit();
PERFETTO_DCHECK(thread_.joinable());
}
if (thread_.joinable())
thread_.join();
}
ThreadTaskRunner::ThreadTaskRunner(const std::string& name) : name_(name) {
std::mutex init_lock;
std::condition_variable init_cv;
std::function<void(UnixTaskRunner*)> initializer =
[this, &init_lock, &init_cv](UnixTaskRunner* task_runner) {
std::lock_guard<std::mutex> lock(init_lock);
task_runner_ = task_runner;
// Notify while still holding the lock, as init_cv ceases to exist as
// soon as the main thread observes a non-null task_runner_, and it can
// wake up spuriously (i.e. before the notify if we had unlocked before
// notifying).
init_cv.notify_one();
};
thread_ = std::thread(&ThreadTaskRunner::RunTaskThread, this,
std::move(initializer));
std::unique_lock<std::mutex> lock(init_lock);
init_cv.wait(lock, [this] { return !!task_runner_; });
}
void ThreadTaskRunner::RunTaskThread(
std::function<void(UnixTaskRunner*)> initializer) {
if (!name_.empty()) {
base::MaybeSetThreadName(name_);
}
UnixTaskRunner task_runner;
task_runner.PostTask(std::bind(std::move(initializer), &task_runner));
task_runner.Run();
}
void ThreadTaskRunner::PostTaskAndWaitForTesting(std::function<void()> fn) {
std::mutex mutex;
std::condition_variable cv;
std::unique_lock<std::mutex> lock(mutex);
bool done = false;
task_runner_->PostTask([&mutex, &cv, &done, &fn] {
fn();
std::lock_guard<std::mutex> inner_lock(mutex);
done = true;
cv.notify_one();
});
cv.wait(lock, [&done] { return done; });
}
uint64_t ThreadTaskRunner::GetThreadCPUTimeNsForTesting() {
uint64_t thread_time_ns = 0;
PostTaskAndWaitForTesting([&thread_time_ns] {
thread_time_ns = static_cast<uint64_t>(base::GetThreadCPUTimeNs().count());
});
return thread_time_ns;
}
} // namespace base
} // namespace perfetto
#endif // !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
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