92 lines
2 KiB
C++
92 lines
2 KiB
C++
// Copyright 2016 Google Inc. All rights reserved
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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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// +build ignore
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#include "thread_pool.h"
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#include <condition_variable>
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#include <mutex>
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#include <stack>
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#include <thread>
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#include <vector>
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#include "affinity.h"
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class ThreadPoolImpl : public ThreadPool {
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public:
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explicit ThreadPoolImpl(int num_threads)
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: is_waiting_(false) {
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SetAffinityForMultiThread();
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threads_.reserve(num_threads);
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for (int i = 0; i < num_threads; i++) {
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threads_.push_back(thread([this]() { Loop(); }));
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}
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}
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virtual ~ThreadPoolImpl() override {
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}
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virtual void Submit(function<void(void)> task) override {
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unique_lock<mutex> lock(mu_);
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tasks_.push(task);
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cond_.notify_one();
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}
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virtual void Wait() override {
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{
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unique_lock<mutex> lock(mu_);
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is_waiting_ = true;
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cond_.notify_all();
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}
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for (thread& th : threads_) {
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th.join();
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}
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SetAffinityForSingleThread();
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}
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private:
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void Loop() {
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while (true) {
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function<void(void)> task;
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{
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unique_lock<mutex> lock(mu_);
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if (tasks_.empty()) {
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if (is_waiting_)
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return;
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cond_.wait(lock);
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}
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if (tasks_.empty())
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continue;
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task = tasks_.top();
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tasks_.pop();
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}
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task();
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}
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}
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vector<thread> threads_;
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mutex mu_;
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condition_variable cond_;
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stack<function<void(void)>> tasks_;
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bool is_waiting_;
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};
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ThreadPool* NewThreadPool(int num_threads) {
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return new ThreadPoolImpl(num_threads);
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}
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