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/*
* Copyright (C) 2014 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 "task_processor.h"
#include "base/time_utils.h"
#include "common_runtime_test.h"
#include "thread-current-inl.h"
#include "thread_pool.h"
namespace art HIDDEN {
namespace gc {
class TaskProcessorTest : public CommonRuntimeTest {
public:
};
class RecursiveTask : public HeapTask {
public:
RecursiveTask(TaskProcessor* task_processor, Atomic<size_t>* counter, size_t max_recursion)
: HeapTask(NanoTime() + MsToNs(10)), task_processor_(task_processor), counter_(counter),
max_recursion_(max_recursion) {
}
void Run(Thread* self) override {
if (max_recursion_ > 0) {
task_processor_->AddTask(self,
new RecursiveTask(task_processor_, counter_, max_recursion_ - 1));
counter_->fetch_add(1U, std::memory_order_seq_cst);
}
}
private:
TaskProcessor* const task_processor_;
Atomic<size_t>* const counter_;
const size_t max_recursion_;
};
class WorkUntilDoneTask : public SelfDeletingTask {
public:
WorkUntilDoneTask(TaskProcessor* task_processor, Atomic<bool>* done_running)
: task_processor_(task_processor), done_running_(done_running) {
}
void Run(Thread* self) override {
task_processor_->RunAllTasks(self);
done_running_->store(true, std::memory_order_seq_cst);
}
private:
TaskProcessor* const task_processor_;
Atomic<bool>* done_running_;
};
TEST_F(TaskProcessorTest, Interrupt) {
std::unique_ptr<ThreadPool> thread_pool(ThreadPool::Create("task processor test", 1U));
Thread* const self = Thread::Current();
TaskProcessor task_processor;
static constexpr size_t kRecursion = 10;
Atomic<bool> done_running(false);
Atomic<size_t> counter(0);
task_processor.AddTask(self, new RecursiveTask(&task_processor, &counter, kRecursion));
task_processor.Start(self);
// Add a task which will wait until interrupted to the thread pool.
thread_pool->AddTask(self, new WorkUntilDoneTask(&task_processor, &done_running));
thread_pool->StartWorkers(self);
ASSERT_FALSE(done_running);
// Wait until all the tasks are done, but since we didn't interrupt, done_running should be 0.
while (counter.load(std::memory_order_seq_cst) != kRecursion) {
usleep(10);
}
ASSERT_FALSE(done_running);
task_processor.Stop(self);
thread_pool->Wait(self, true, false);
// After the interrupt and wait, the WorkUntilInterruptedTasktask should have terminated and
// set done_running_ to true.
ASSERT_TRUE(done_running.load(std::memory_order_seq_cst));
// Test that we finish remaining tasks before returning from RunTasksUntilInterrupted.
counter.store(0, std::memory_order_seq_cst);
done_running.store(false, std::memory_order_seq_cst);
// Self interrupt before any of the other tasks run, but since we added them we should keep on
// working until all the tasks are completed.
task_processor.Stop(self);
task_processor.AddTask(self, new RecursiveTask(&task_processor, &counter, kRecursion));
thread_pool->AddTask(self, new WorkUntilDoneTask(&task_processor, &done_running));
thread_pool->StartWorkers(self);
thread_pool->Wait(self, true, false);
ASSERT_TRUE(done_running.load(std::memory_order_seq_cst));
ASSERT_EQ(counter.load(std::memory_order_seq_cst), kRecursion);
}
class TestOrderTask : public HeapTask {
public:
TestOrderTask(uint64_t expected_time, size_t expected_counter, size_t* counter)
: HeapTask(expected_time), expected_counter_(expected_counter), counter_(counter) {
}
void Run([[maybe_unused]] Thread* thread) override {
ASSERT_EQ(*counter_, expected_counter_);
++*counter_;
}
private:
const size_t expected_counter_;
size_t* const counter_;
};
TEST_F(TaskProcessorTest, Ordering) {
static const size_t kNumTasks = 25;
const uint64_t current_time = NanoTime();
Thread* const self = Thread::Current();
TaskProcessor task_processor;
task_processor.Stop(self);
size_t counter = 0;
std::vector<std::pair<uint64_t, size_t>> orderings;
for (size_t i = 0; i < kNumTasks; ++i) {
orderings.push_back(std::make_pair(current_time + MsToNs(10U * i), i));
}
for (size_t i = 0; i < kNumTasks; ++i) {
std::swap(orderings[i], orderings[(i * 87654231 + 12345) % orderings.size()]);
}
for (const auto& pair : orderings) {
auto* task = new TestOrderTask(pair.first, pair.second, &counter);
task_processor.AddTask(self, task);
}
std::unique_ptr<ThreadPool> thread_pool(ThreadPool::Create("task processor test", 1U));
Atomic<bool> done_running(false);
// Add a task which will wait until interrupted to the thread pool.
thread_pool->AddTask(self, new WorkUntilDoneTask(&task_processor, &done_running));
ASSERT_FALSE(done_running.load(std::memory_order_seq_cst));
thread_pool->StartWorkers(self);
thread_pool->Wait(self, true, false);
ASSERT_TRUE(done_running.load(std::memory_order_seq_cst));
ASSERT_EQ(counter, kNumTasks);
}
} // namespace gc
} // namespace art
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