mirror of
https://github.com/kidfromjupiter/nearby.git
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65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
// Copyright 2020 Google LLC
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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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// https://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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#ifndef PLATFORM_IMPL_G3_MULTI_THREAD_EXECUTOR_H_
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#define PLATFORM_IMPL_G3_MULTI_THREAD_EXECUTOR_H_
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#include <atomic>
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#include "absl/time/clock.h"
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#include "internal/platform/implementation/submittable_executor.h"
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#include "internal/platform/implementation/shared/count_down_latch.h"
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#include "nisaba/port/thread_pool.h"
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namespace nearby {
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namespace g3 {
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// An Executor that reuses a fixed number of threads operating off a shared
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// unbounded queue.
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class MultiThreadExecutor : public api::SubmittableExecutor {
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public:
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explicit MultiThreadExecutor(int max_parallelism)
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: thread_pool_(max_parallelism) {
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thread_pool_.StartWorkers();
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}
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void Execute(Runnable&& runnable) override {
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if (!shutdown_) {
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thread_pool_.Schedule(std::move(runnable));
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}
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}
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bool DoSubmit(Runnable&& runnable) override {
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if (shutdown_) return false;
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thread_pool_.Schedule(std::move(runnable));
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return true;
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}
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void Shutdown() override { DoShutdown(); }
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~MultiThreadExecutor() override { DoShutdown(); }
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void ScheduleAfter(absl::Duration delay, Runnable&& runnable) {
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if (shutdown_) return;
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thread_pool_.ScheduleAt(absl::Now() + delay, std::move(runnable));
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}
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bool InShutdown() const { return shutdown_; }
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private:
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void DoShutdown() { shutdown_ = true; }
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std::atomic_bool shutdown_ = false;
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ThreadPool thread_pool_;
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};
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} // namespace g3
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} // namespace nearby
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#endif // PLATFORM_IMPL_G3_MULTI_THREAD_EXECUTOR_H_
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