80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
/*
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* This file is open source software, licensed to you under the terms
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* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
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* distributed with this work for additional information regarding copyright
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* ownership. You may not use this file except in compliance with the License.
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*
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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,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/*
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* Copyright (C) 2020 Cloudius Systems, Ltd.
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*/
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#pragma once
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#include <seastar/core/sharded.hh>
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#include <seastar/core/reactor.hh>
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#include <seastar/core/condition-variable.hh>
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#include <seastar/core/signal.hh>
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/// Seastar apps lib namespace
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namespace seastar_apps_lib {
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/// \brief Futurized SIGINT/SIGTERM signals handler class
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///
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/// Seastar-style helper class that allows easy waiting for SIGINT/SIGTERM signals
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/// from your app.
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///
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/// Example:
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/// \code
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/// #include <seastar/apps/lib/stop_signal.hh>
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/// ...
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/// int main() {
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/// ...
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/// seastar::thread th([] {
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/// seastar_apps_lib::stop_signal stop_signal;
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/// <some code>
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/// stop_signal.wait().get(); // this will wait till we receive SIGINT or SIGTERM signal
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/// });
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/// \endcode
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class stop_signal {
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bool _caught = false;
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seastar::condition_variable _cond;
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private:
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void signaled() {
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if (_caught) {
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return;
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}
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_caught = true;
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_cond.broadcast();
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}
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public:
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stop_signal() {
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seastar::handle_signal(SIGINT, [this] { signaled(); });
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seastar::handle_signal(SIGTERM, [this] { signaled(); });
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}
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~stop_signal() {
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// There's no way to unregister a handler yet, so register a no-op handler instead.
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seastar::handle_signal(SIGINT, [] {});
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seastar::handle_signal(SIGTERM, [] {});
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}
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seastar::future<> wait() {
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return _cond.wait([this] { return _caught; });
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}
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bool stopping() const {
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return _caught;
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}
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};
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} |