70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <platform/api/task_runner.h>
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#include <atomic>
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#include <condition_variable>
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#include <map>
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#include <mutex>
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#include <optional>
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#include <thread>
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#include <android-base/thread_annotations.h>
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namespace mdns {
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// Openscreen API surface that allows for posting tasks. The underlying
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// implementation may be single or multi-threaded, and all complication should
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// be handled by the implementation class. The implementation must guarantee:
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// (1) Tasks shall not overlap in time/CPU.
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// (2) Tasks shall run sequentially, e.g. posting task A then B implies
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// that A shall run before B.
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// (3) If task A is posted before task B, then any mutation in A happens-before
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// B runs (even if A and B run on different threads).
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//
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// Adb implementation: The PostPackagedTask* APIs are thread-safe.
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// Another thread will handle dequeuing each item and calling it on the fdevent thread.
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// Thus, the task runner thread is the fdevent thread, and IsRunningOnTaskRunner() shall always
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// return true if calling from within the running Task.
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class AdbOspTaskRunner final : public openscreen::TaskRunner {
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public:
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using Task = openscreen::TaskRunner::Task;
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// Must be called on the fdevent thread.
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explicit AdbOspTaskRunner();
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~AdbOspTaskRunner() final;
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void PostPackagedTask(Task task) final;
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void PostPackagedTaskWithDelay(Task task, openscreen::Clock::duration delay) final;
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bool IsRunningOnTaskRunner() final;
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// The task executor thread.
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void TaskExecutorWorker();
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private:
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uint64_t thread_id_;
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std::mutex mutex_;
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std::multimap<std::chrono::time_point<std::chrono::steady_clock>, Task> tasks_
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GUARDED_BY(mutex_);
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std::atomic<bool> terminate_loop_ = false;
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std::condition_variable cv_;
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std::thread task_handler_;
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};
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} // namespace mdns
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