node_watchdog.h

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// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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#ifndef SRC_NODE_WATCHDOG_H_
#define SRC_NODE_WATCHDOG_H_

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#include "v8.h"
#include "uv.h"
#include "node_mutex.h"
#include <vector>

#ifdef __POSIX__
#include <pthread.h>
#endif

namespace node {

class Watchdog {
 public:
  explicit Watchdog(v8::Isolate* isolate,
                    uint64_t ms,
                    bool* timed_out = nullptr);
  ~Watchdog();
  v8::Isolate* isolate() { return isolate_; }

 private:
  static void Run(void* arg);
  static void Async(uv_async_t* async);
  static void Timer(uv_timer_t* timer);

  v8::Isolate* isolate_;
  uv_thread_t thread_;
  uv_loop_t* loop_;
  uv_async_t async_;
  uv_timer_t timer_;
  bool* timed_out_;
};

class SigintWatchdog {
 public:
  explicit SigintWatchdog(v8::Isolate* isolate,
                          bool* received_signal = nullptr);
  ~SigintWatchdog();
  v8::Isolate* isolate() { return isolate_; }
  void HandleSigint();

 private:
  v8::Isolate* isolate_;
  bool* received_signal_;
};

class SigintWatchdogHelper {
 public:
  static SigintWatchdogHelper* GetInstance() { return &instance; }
  void Register(SigintWatchdog* watchdog);
  void Unregister(SigintWatchdog* watchdog);
  bool HasPendingSignal();

  int Start();
  bool Stop();

 private:
  SigintWatchdogHelper();
  ~SigintWatchdogHelper();

  static bool InformWatchdogsAboutSignal();
  static SigintWatchdogHelper instance;

  int start_stop_count_;

  Mutex mutex_;
  Mutex list_mutex_;
  std::vector<SigintWatchdog*> watchdogs_;
  bool has_pending_signal_;

#ifdef __POSIX__
  pthread_t thread_;
  uv_sem_t sem_;
  bool has_running_thread_;
  bool stopping_;

  static void* RunSigintWatchdog(void* arg);
  static void HandleSignal(int signum);
#else
  bool watchdog_disabled_;
  static BOOL WINAPI WinCtrlCHandlerRoutine(DWORD dwCtrlType);
#endif
};

}  // namespace node

#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#endif  // SRC_NODE_WATCHDOG_H_