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Diffstat (limited to 'src/cpp/server/thread_pool.cc')
-rw-r--r-- | src/cpp/server/thread_pool.cc | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/cpp/server/thread_pool.cc b/src/cpp/server/thread_pool.cc new file mode 100644 index 0000000000..ce364c4795 --- /dev/null +++ b/src/cpp/server/thread_pool.cc @@ -0,0 +1,77 @@ +/* + * + * Copyright 2014, Google Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following disclaimer + * in the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Google Inc. nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include "src/cpp/server/thread_pool.h" + +namespace grpc { + +ThreadPool::ThreadPool(int num_threads) { + for (int i = 0; i < num_threads; i++) { + threads_.push_back(std::thread([=]() { + for (;;) { + std::unique_lock<std::mutex> lock(mu_); + // Wait until work is available or we are shutting down. + cv_.wait(lock, [=]() { return shutdown_ || !callbacks_.empty(); }); + // Drain callbacks before considering shutdown to ensure all work + // gets completed. + if (!callbacks_.empty()) { + auto cb = callbacks_.front(); + callbacks_.pop(); + lock.unlock(); + cb(); + } else if (shutdown_) { + return; + } + } + })); + } +} + +ThreadPool::~ThreadPool() { + { + std::lock_guard<std::mutex> lock(mu_); + shutdown_ = true; + cv_.notify_all(); + } + for (auto& t : threads_) { + t.join(); + } +} + +void ThreadPool::ScheduleCallback(const std::function<void()>& callback) { + std::lock_guard<std::mutex> lock(mu_); + callbacks_.push(callback); + cv_.notify_all(); +} + +} // namespace grpc |