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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_HOST_SHUTDOWN_WATCHDOG_H_
#define REMOTING_HOST_SHUTDOWN_WATCHDOG_H_
#include "base/synchronization/lock.h"
#include "base/threading/watchdog.h"
namespace remoting {
// This implements a watchdog timer that ensures the host process eventually
// terminates, even if some threads are blocked or being kept alive for
// some reason. This is not expected to trigger if host shutdown is working
// correctly (on a normally loaded system). The triggering of the alarm
// indicates a sign of trouble, and so the Alarm() method will log some
// diagnostic information before shutting down the process.
class ShutdownWatchdog : public base::Watchdog::Delegate {
public:
// Creates a watchdog that waits for |duration| (after the watchdog is
// armed) before shutting down the process.
explicit ShutdownWatchdog(const base::TimeDelta& duration);
ShutdownWatchdog(const ShutdownWatchdog&) = delete;
ShutdownWatchdog& operator=(const ShutdownWatchdog&) = delete;
void Arm();
// This method should be called to set the process's exit-code before arming
// the watchdog. Otherwise an exit-code of 0 is assumed.
void SetExitCode(int exit_code);
void Alarm() override;
private:
int exit_code_;
// Protects |exit_code_|, since Alarm() gets called on a separate thread.
base::Lock lock_;
base::Watchdog watchdog_;
};
} // namespace remoting
#endif // REMOTING_HOST_SHUTDOWN_WATCHDOG_H_
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