API docs for “twisted.internet.base.

Private mixin to manage signals: it installs signal handlers at start time, and define run method.

It can only be used mixed in with ReactorBase, and has to be defined first in the inheritance (so that method resolution order finds startRunning first).

Instance Variables _installSignalHandlers A flag which indicates whether any signal handlers will be installed during startup. This includes handlers for SIGCHLD to monitor child processes, and SIGINT, SIGTERM, and SIGBREAK to stop the reactor. (type: bool )

Method	startRunning	Extend the base implementation in order to remember whether signal
Method	run	Undocumented
Method	mainLoop	Undocumented
Method	_handleSignals	Install the signal handlers for the Twisted event loop.
Method	_handleSigchld	Reap all processes on SIGCHLD.
Method	_reallyStartRunning	Extend the base implementation by also installing signal handlers, if

def _handleSigchld(self, signum, frame, _threadSupport=platform.supportsThreads()): (source)

Reap all processes on SIGCHLD.

This gets called on SIGCHLD. We do no processing inside a signal handler, as the calls we make here could occur between any two python bytecode instructions. Deferring processing to the next eventloop round prevents us from violating the state constraints of arbitrary classes.

def startRunning(self, installSignalHandlers=True): (source)

Extend the base implementation in order to remember whether signal handlers should be installed later.

Parameters installSignalHandlers A flag which, if set, indicates that handlers for a number of (implementation-defined) signals should be installed during startup. (type: bool )

def _reallyStartRunning(self): (source)

Extend the base implementation by also installing signal handlers, if self._installSignalHandlers is true.

Class t.i.b._SignalReactorMixin: