}

See the :ref:`topics-signals-ref` below to know which signals support
:class:`~twisted.internet.defer.Deferred` and :term:`awaitable objects <awaitable>`.

.. _topics-signals-ref:

Built-in signals reference
==========================

.. module:: scrapy.signals
   :synopsis: Signals definitions

Here's the list of Scrapy built-in signals and their meaning.

Engine signals
--------------

     * @return void
     */
    public function register($signal, $callback)
    {
        $this->previousHandlers[$signal] ??= $this->initializeSignal($signal);

        with($this->getHandlers(), function ($handlers) use ($signal) {
            $handlers[$signal] ??= $this->initializeSignal($signal);

            $this->setHandlers($handlers);
        });

  // For unknown reasons, we receive signals 2 times.
  // As a temporary fix, we ignore the signals received after the first one.

  const terminateStrapi = async () => {
    if (!signalReceived) {
      signalReceived = true;
      await strapi.destroy();
      process.exit();
    }
  };

  ['SIGTERM', 'SIGINT'].forEach((signal) => {
    process.on(signal, terminateStrapi);
  });
};

module.exports = {

      process.env.PM2_KILL_TIMEOUT = 3000;

      pm2.update(function() {
        done();
      });
    });

    it('should start a script', function(done) {
      pm2.start({
        script : './signals/delayed_sigint.js',
        name : 'delayed-sigint'
      }, function(err, data) {
        proc1 = data[0];
        should(err).be.null();
        setTimeout(done, 1000);
      });
    });

a,b=this._listener.apply(this.context,a),this._isOnce&&this.detach());return b},detach:function(){return this.isBound()?this._signal.remove(this._listener,this.context):null},isBound:function(){return!!this._signal&&!!this._listener},isOnce:function(){return this._isOnce},getListener:function(){return this._listener},getSignal:function(){return this._signal},_destroy:function(){delete this._signal;delete this._listener;delete this.context},toString:function(){return"[SignalBinding isOnce:"+this._isOnce+

    d.addCallback(lambda out: [x[1] for x in out])
    return d


def disconnect_all(signal=Any, sender=Any):
    """Disconnect all signal handlers. Useful for cleaning up after running
    tests
    """
    for receiver in liveReceivers(getAllReceivers(sender, signal)):

        pthread_cond_broadcast(&signal_caught_cond);
        pthread_cond_wait(&exit_signal_cond, &in_signal_lock);
        request = jl_atomic_exchange(&ptls->signal_request, 0);
        assert(request == 1 || request == 3);
        // acknowledge that we got the resume signal
        pthread_cond_broadcast(&signal_caught_cond);
        pthread_mutex_unlock(&in_signal_lock);
    }
    else
#endif

			exit(stopProcess())
		case osSignal := <-globalOSSignalCh:
			logger.Info("Exiting on signal: %s", strings.ToUpper(osSignal.String()))
			exit(stopProcess())
		case signal := <-globalServiceSignalCh:
			switch signal {
			case serviceRestart:
				logger.Info("Restarting on service signal")
				stop := stopProcess()
				rerr := restartProcess()
				logger.LogIf(context.Background(), rerr)

import signal

from ..const import IS_WINDOWS_PLATFORM


class ShutdownException(Exception):
    pass


class HangUpException(Exception):
    pass


def shutdown(signal, frame):
    raise ShutdownException()


def set_signal_handler(handler):
    signal.signal(signal.SIGINT, handler)
    signal.signal(signal.SIGTERM, handler)


def set_signal_handler_to_shutdown():
    set_signal_handler(shutdown)

"""
Scrapy signals

These signals are documented in docs/topics/signals.rst. Please don't add new
signals here without documenting them there.
"""

engine_started = object()
engine_stopped = object()
spider_opened = object()
spider_idle = object()
spider_closed = object()
spider_error = object()
request_scheduled = object()
request_dropped = object()
request_reached_downloader = object()
request_left_downloader = object()