Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 2014, Google Inc. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are |
| 8 | * met: |
| 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above |
| 13 | * copyright notice, this list of conditions and the following disclaimer |
| 14 | * in the documentation and/or other materials provided with the |
| 15 | * distribution. |
| 16 | * * Neither the name of Google Inc. nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
| 34 | #include "src/cpp/server/thread_pool.h" |
| 35 | |
| 36 | namespace grpc { |
| 37 | |
| 38 | ThreadPool::ThreadPool(int num_threads) { |
| 39 | for (int i = 0; i < num_threads; i++) { |
| 40 | threads_.push_back(std::thread([=]() { |
| 41 | for (;;) { |
| 42 | std::unique_lock<std::mutex> lock(mu_); |
| 43 | // Wait until work is available or we are shutting down. |
| 44 | cv_.wait(lock, [=]() { return shutdown_ || !callbacks_.empty(); }); |
| 45 | // Drain callbacks before considering shutdown to ensure all work |
| 46 | // gets completed. |
| 47 | if (!callbacks_.empty()) { |
| 48 | auto cb = callbacks_.front(); |
| 49 | callbacks_.pop(); |
| 50 | lock.unlock(); |
| 51 | cb(); |
| 52 | } else if (shutdown_) { |
| 53 | return; |
| 54 | } |
| 55 | } |
| 56 | })); |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | ThreadPool::~ThreadPool() { |
| 61 | { |
| 62 | std::lock_guard<std::mutex> lock(mu_); |
| 63 | shutdown_ = true; |
| 64 | cv_.notify_all(); |
| 65 | } |
Craig Tiller | ecd4934 | 2015-01-18 14:36:47 -0800 | [diff] [blame] | 66 | for (auto &t : threads_) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 67 | t.join(); |
| 68 | } |
| 69 | } |
| 70 | |
Craig Tiller | ecd4934 | 2015-01-18 14:36:47 -0800 | [diff] [blame] | 71 | void ThreadPool::ScheduleCallback(const std::function<void()> &callback) { |
Nicolas Noble | b7ebd3b | 2014-11-26 16:33:03 -0800 | [diff] [blame] | 72 | std::lock_guard<std::mutex> lock(mu_); |
| 73 | callbacks_.push(callback); |
| 74 | cv_.notify_all(); |
| 75 | } |
| 76 | |
| 77 | } // namespace grpc |