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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.
*/
#ifndef ART_RUNTIME_GC_TASK_PROCESSOR_H_
#define ART_RUNTIME_GC_TASK_PROCESSOR_H_
#include <memory>
#include <set>
#include "base/mutex.h"
#include "globals.h"
#include "thread_pool.h"
namespace art {
namespace gc {
class HeapTask : public SelfDeletingTask {
public:
explicit HeapTask(uint64_t target_run_time) : target_run_time_(target_run_time) {
}
uint64_t GetTargetRunTime() const {
return target_run_time_;
}
private:
// Update the updated_target_run_time_, the task processor will re-insert the task when it is
// popped and update the target_run_time_.
void SetTargetRunTime(uint64_t new_target_run_time) {
target_run_time_ = new_target_run_time;
}
// Time in ns at which we want the task to run.
uint64_t target_run_time_;
friend class TaskProcessor;
};
// Used to process GC tasks (heap trim, heap transitions, concurrent GC).
class TaskProcessor {
public:
TaskProcessor();
virtual ~TaskProcessor();
void AddTask(Thread* self, HeapTask* task) LOCKS_EXCLUDED(lock_);
HeapTask* GetTask(Thread* self) LOCKS_EXCLUDED(lock_);
void Start(Thread* self) LOCKS_EXCLUDED(lock_);
// Stop tells the RunAllTasks to finish up the remaining tasks as soon as
// possible then return.
void Stop(Thread* self) LOCKS_EXCLUDED(lock_);
void RunAllTasks(Thread* self) LOCKS_EXCLUDED(lock_);
bool IsRunning() const LOCKS_EXCLUDED(lock_);
void UpdateTargetRunTime(Thread* self, HeapTask* target_time, uint64_t new_target_time)
LOCKS_EXCLUDED(lock_);
Thread* GetRunningThread() const LOCKS_EXCLUDED(lock_);
private:
class CompareByTargetRunTime {
public:
bool operator()(const HeapTask* a, const HeapTask* b) const {
return a->GetTargetRunTime() < b->GetTargetRunTime();
}
};
mutable Mutex* lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
bool is_running_ GUARDED_BY(lock_);
std::unique_ptr<ConditionVariable> cond_ GUARDED_BY(lock_);
std::multiset<HeapTask*, CompareByTargetRunTime> tasks_ GUARDED_BY(lock_);
Thread* running_thread_ GUARDED_BY(lock_);
};
} // namespace gc
} // namespace art
#endif // ART_RUNTIME_GC_TASK_PROCESSOR_H_
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