sigint.h

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// Copyright 2010-2025 Google LLC
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#ifndef OR_TOOLS_UTIL_SIGINT_H_
#define OR_TOOLS_UTIL_SIGINT_H_
 
#include <atomic>
#include <functional>
 
namespace operations_research {
 
class SigintHandler {
 public:
  SigintHandler() = default;
  ~SigintHandler();
 
  // Catches ^C and call f() the first time this happen. If ^C is pressed 3
  // times, kill the program.
  void Register(const std::function<void()>& f);
 
 private:
  std::atomic<int> num_calls_ = 0;
 
  static void SigHandler(int s);
  thread_local static std::function<void()> handler_;
};
 
class SigtermHandler {
 public:
  SigtermHandler() = default;
  ~SigtermHandler();
 
  // Catches SIGTERM and call f(). It is recommended that f() calls exit() to
  // terminate the program.
  void Register(const std::function<void()>& f);
 
 private:
  static void SigHandler(int s);
  thread_local static std::function<void()> handler_;
};
 
}  // namespace operations_research
 
#endif  // OR_TOOLS_UTIL_SIGINT_H_