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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/time.h>
#include <thread>
#include <atomic>
namespace vespalib {
/**
* Class to ensure that the current process finishes within a given time.
* Construct with the number of milliseconds before triggering _exit();
* destruct the ShutdownGuard object to dismiss the automatic process
* termination.
* A separate shutdown thread will perform the actual _exit() call.
**/
class ShutdownGuard
{
std::thread _thread;
steady_time _dieAtTime;
std::atomic<bool> _cancel;
void run();
public:
/**
* Construct a shutdown guard with a given lifetime.
* @arg millis the number of milliseconds before process automatically exits
**/
ShutdownGuard(duration millis);
/**
* Destructor that dismisses the guard and collects the shutdown thread.
**/
~ShutdownGuard();
};
} // namespace vespalib
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