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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/thread_task_runner.h"
#include <thread>
#include "gtest/gtest.h"
#include "perfetto/base/thread_checker.h"
namespace perfetto {
namespace base {
namespace {
class ThreadTaskRunnerTest : public ::testing::Test {
protected:
std::atomic<bool> atomic_flag_{false};
};
TEST_F(ThreadTaskRunnerTest, ConstructedRunning) {
ThreadTaskRunner task_runner = ThreadTaskRunner::CreateAndStart();
task_runner.get()->PostTask([this] { atomic_flag_ = true; });
// main thread not blocked, wait on the task explicitly
while (!atomic_flag_) {
std::this_thread::yield();
}
}
TEST_F(ThreadTaskRunnerTest, RunsTasksOnOneDedicatedThread) {
ThreadTaskRunner task_runner = ThreadTaskRunner::CreateAndStart();
EXPECT_FALSE(task_runner.get()->RunsTasksOnCurrentThread());
ThreadChecker thread_checker;
task_runner.get()->PostTask([&thread_checker] {
// make thread_checker track the task thread
thread_checker.DetachFromThread();
EXPECT_TRUE(thread_checker.CalledOnValidThread());
});
task_runner.get()->PostTask([this, &thread_checker] {
// called on the same thread
EXPECT_TRUE(thread_checker.CalledOnValidThread());
atomic_flag_ = true;
});
while (!atomic_flag_) {
std::this_thread::yield();
}
}
TEST_F(ThreadTaskRunnerTest, MovableOwnership) {
ThreadTaskRunner task_runner = ThreadTaskRunner::CreateAndStart();
UnixTaskRunner* runner_ptr = task_runner.get();
EXPECT_NE(runner_ptr, nullptr);
ThreadChecker thread_checker;
task_runner.get()->PostTask([&thread_checker] {
// make thread_checker track the task thread
thread_checker.DetachFromThread();
EXPECT_TRUE(thread_checker.CalledOnValidThread());
});
// move ownership and destroy old instance
ThreadTaskRunner task_runner2 = std::move(task_runner);
EXPECT_EQ(task_runner.get(), nullptr);
task_runner.~ThreadTaskRunner();
// runner pointer is stable, and remains usable
EXPECT_EQ(task_runner2.get(), runner_ptr);
task_runner2.get()->PostTask([this, &thread_checker] {
// task thread remains the same
EXPECT_TRUE(thread_checker.CalledOnValidThread());
atomic_flag_ = true;
});
while (!atomic_flag_) {
std::this_thread::yield();
}
}
// Test helper callable that remembers a copy of a given ThreadChecker, and
// checks that this class' destructor runs on the remembered thread. Note that
// it is copyable so that it can be passed as a task (i.e. std::function) to a
// task runner. Also note that all instances of this class will thread-check,
// including those that have been moved-from.
class DestructorThreadChecker {
public:
DestructorThreadChecker(ThreadChecker checker) : checker_(checker) {}
DestructorThreadChecker(const DestructorThreadChecker&) = default;
DestructorThreadChecker& operator=(const DestructorThreadChecker&) = default;
DestructorThreadChecker(DestructorThreadChecker&&) = default;
DestructorThreadChecker& operator=(DestructorThreadChecker&&) = default;
~DestructorThreadChecker() { EXPECT_TRUE(checker_.CalledOnValidThread()); }
void operator()() { GTEST_FAIL() << "shouldn't be called"; }
ThreadChecker checker_;
};
// Checks that the still-pending tasks (and therefore the UnixTaskRunner itself)
// are destructed on the task thread, and not the thread that destroys the
// ThreadTaskRunner.
TEST_F(ThreadTaskRunnerTest, EnqueuedTasksDestructedOnTaskThread) {
ThreadChecker thread_checker;
ThreadTaskRunner task_runner = ThreadTaskRunner::CreateAndStart();
task_runner.get()->PostTask([this, &thread_checker, &task_runner] {
// make thread_checker track the task thread
thread_checker.DetachFromThread();
EXPECT_TRUE(thread_checker.CalledOnValidThread());
// Post a follow-up delayed task and unblock the main thread, which will
// destroy the ThreadTaskRunner while this task is still pending.
//
// Note: DestructorThreadChecker will thread-check (at least) twice:
// * for the temporary that was moved-from to construct the task
// std::function. Will pass as we're posting from a task thread.
// * for the still-pending task once the ThreadTaskRunner destruction causes
// the destruction of UnixTaskRunner.
task_runner.get()->PostDelayedTask(DestructorThreadChecker(thread_checker),
100 * 1000 /*ms*/);
atomic_flag_ = true;
});
while (!atomic_flag_) {
std::this_thread::yield();
}
}
} // namespace
} // namespace base
} // namespace perfetto
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