twisted.internet._glibbase.GlibReactorBase

Known subclasses: twisted.internet.gireactor.GIReactor, twisted.internet.gtk2reactor.Gtk2Reactor

Implements interfaces: twisted.internet.interfaces.IReactorFDSet

Base class for GObject event loop reactors.

Notification for I/O events (reads and writes on file descriptors) is done by the gobject-based event loop. File descriptors are registered with gobject with the appropriate flags for read/write/disconnect notification.

Time-based events, the results of callLater and callFromThread, are handled differently. Rather than registering each event with gobject, a single gobject timeout is registered for the earliest scheduled event, the output of reactor.timeout(). For example, if there are timeouts in 1, 2 and 3.4 seconds, a single timeout is registered for 1 second in the future. When this timeout is hit, _simulate is called, which calls the appropriate Twisted-level handlers, and a new timeout is added to gobject by the _reschedule method.

To handle callFromThread events, we use a custom waker that calls _simulate whenever it wakes up.

Method	__init__	Undocumented
Method	input_add	Undocumented
Method	addReader	Add a `FileDescriptor` for monitoring of data available to read.
Method	addWriter	Add a `FileDescriptor` for monitoring ability to write data.
Method	getReaders	Retrieve the list of current `FileDescriptor` monitored for reading.
Method	getWriters	Retrieve the list of current `FileDescriptor` monitored for writing.
Method	removeAll	Remove monitoring for all registered `FileDescriptor`s.
Method	removeReader	Stop monitoring the given `FileDescriptor` for reading.
Method	removeWriter	Stop monitoring the given `FileDescriptor` for writing.
Method	iterate	One iteration of the event loop, for trial's use.
Method	crash	Crash the reactor.
Method	stop	Stop the reactor.
Method	run	Run the reactor.
Method	callLater	Schedule a `DelayedCall`.
Instance Variable	_sources	A dictionary mapping `FileDescriptor` instances to GSource handles.
Instance Variable	_reads	A set of `FileDescriptor` instances currently monitored for reading.
Instance Variable	_writes	A set of `FileDescriptor` instances currently monitored for writing.
Instance Variable	_simtag	A GSource handle for the next `simulate` call.
Method	_handleSignals	Extend the basic signal handling logic to also support handling SIGCHLD to know when to try to reap child processes.
Method	_ioEventCallback	Called by event loop when an I/O event occurs.
Method	_add	No summary
Method	_remove	Remove monitoring the given `FileDescriptor` for either reading or writing. If it's still monitored for the other operation, we re-register the `FileDescriptor` for only that operation.
Method	_reschedule	Schedule a glib timeout for `_simulate`.
Method	_simulate	Run timers, and then reschedule glib timeout for next scheduled event.

Inherited from PosixReactorBase:

Method	installWaker	Install a `waker' to allow threads and signals to wake up the IO thread.
Method	spawnProcess	Spawn a process, with a process protocol.
Method	listenUDP	Connects a given `DatagramProtocol` to the given numeric UDP port.
Method	listenMulticast	Connects a given DatagramProtocol to the given numeric UDP port.
Method	connectUNIX	Connect a client protocol to a UNIX socket.
Method	listenUNIX	Listen on a UNIX socket.
Method	listenUNIXDatagram	Connects a given `DatagramProtocol` to the given path.
Method	connectUNIXDatagram	Connects a `ConnectedDatagramProtocol` instance to a path.
Method	adoptStreamPort	Create a new `IListeningPort` from an already-initialized socket.
Method	adoptStreamConnection
Method	adoptDatagramPort	Add an existing listening SOCK_DGRAM socket to the reactor to monitor for read and write readiness.
Method	listenTCP	Connects a given protocol factory to the given numeric TCP/IP port.
Method	connectTCP	Connect a TCP client.
Method	connectSSL	Connect a client Protocol to a remote SSL socket.
Method	listenSSL	Connects a given protocol factory to the given numeric TCP/IP port. The connection is a SSL one, using contexts created by the context factory.
Instance Variable	_childWaker	`None` or a reference to the `_SIGCHLDWaker` which is used to properly notice child process termination.
Method	_uninstallHandler	If a child waker was created and installed, uninstall it now.
Method	_removeAll	Remove all readers and writers, and list of removed `IReadDescriptor`s and `IWriteDescriptor`s.

Inherited from _SignalReactorMixin (via PosixReactorBase):

Method	startRunning	Extend the base implementation in order to remember whether signal handlers should be installed later.
Method	mainLoop	Undocumented
Instance Variable	_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	_reallyStartRunning	Extend the base implementation by also installing signal handlers, if `self._installSignalHandlers` is true.

Inherited from _DisconnectSelectableMixin (via PosixReactorBase):

Method

_disconnectSelectable

Utility function for disconnecting a selectable.

Inherited from ReactorBase (via PosixReactorBase):

Instance Variable	running	See `IReactorCore.running`
Method	wakeUp	Wake up the event loop.
Method	doIteration	Do one iteration over the readers and writers which have been added.
Method	resolve	Return a Deferred that will resolve a hostname.
Method	sigInt	Handle a SIGINT interrupt.
Method	sigBreak	Handle a SIGBREAK interrupt.
Method	sigTerm	Handle a SIGTERM interrupt.
Method	disconnectAll	Disconnect every reader, and writer in the system.
Method	fireSystemEvent	See twisted.internet.interfaces.IReactorCore.fireSystemEvent.
Method	addSystemEventTrigger	See twisted.internet.interfaces.IReactorCore.addSystemEventTrigger.
Method	removeSystemEventTrigger	See twisted.internet.interfaces.IReactorCore.removeSystemEventTrigger.
Method	callWhenRunning	See twisted.internet.interfaces.IReactorCore.callWhenRunning.
Method	startRunning	Method called when reactor starts: do some initialization and fire startup events.
Method	getDelayedCalls	No summary
Method	timeout	Determine the longest time the reactor may sleep (waiting on I/O notification, perhaps) before it must wake up to service a time-related event.
Method	runUntilCurrent	Run all pending timed calls.
Method	callFromThread 0	See `twisted.internet.interfaces.IReactorFromThreads.callFromThread`.
Method	getThreadPool	See `twisted.internet.interfaces.IReactorThreads.getThreadPool`.
Method	callInThread	See `twisted.internet.interfaces.IReactorInThreads.callInThread`.
Method	suggestThreadPoolSize	See `twisted.internet.interfaces.IReactorThreads.suggestThreadPoolSize`.
Method	callFromThread	Cause a function to be executed by the reactor thread.
Instance Variable	_stopped	A flag which is true between paired calls to `reactor.run` and `reactor.stop`. This should be replaced with an explicit state machine. (type: `bool`)
Instance Variable	_justStopped	A flag which is true between the time `reactor.stop` is called and the time the shutdown system event is fired. This is used to determine whether that event should be fired after each iteration through the mainloop. This should be replaced with an explicit state machine. (type: `bool`)
Instance Variable	_started	A flag which is true from the time `reactor.run` is called until the time `reactor.run` returns. This is used to prevent calls to `reactor.run` on a running reactor. This should be replaced with an explicit state machine. (type: `bool`)
Instance Variable	_registerAsIOThread	A flag controlling whether the reactor will register the thread it is running in as the I/O thread when it starts. If `True`, registration will be done, otherwise it will not be.
Instance Variable	_exitSignal	See `_ISupportsExitSignalCapturing._exitSignal`
Method	_reallyStartRunning	Method called to transition to the running state. This should happen in the during startup event trigger phase.
Method	_moveCallLaterSooner	Undocumented
Method	_cancelCallLater	Undocumented
Method	_insertNewDelayedCalls	Undocumented
Method	_checkProcessArgs	Check for valid arguments and environment to spawnProcess.
Method	_initThreads	Undocumented
Method	_initThreadPool	Create the threadpool accessible with callFromThread.
Method	_stopThreadPool	No summary

Inherited from PluggableResolverMixin (via PosixReactorBase, ReactorBase):

Instance Variable	resolver	The installed `IResolverSimple`.
Method	installResolver	See `IReactorPluggableResolver`.
Method	installNameResolver	See `IReactorPluggableNameResolver`.
Method	nameResolver	Implementation of read-only `IReactorPluggableNameResolver.nameResolver`.
Instance Variable	_nameResolver	The installed `IHostnameResolver`.

Inherited from _PollLikeMixin:

Method

_doReadOrWrite

fd is available for read or write, do the work and raise errors if necessary.

_sources =

A dictionary mapping FileDescriptor instances to GSource handles.

_reads =

A set of FileDescriptor instances currently monitored for reading.

_writes =

A set of FileDescriptor instances currently monitored for writing.

_simtag =

A GSource handle for the next simulate call.

def __init__(self, glib_module, gtk_module, useGtk=False):

overrides twisted.internet.base.ReactorBase.__init__

overridden in twisted.internet.gireactor.GIReactor, twisted.internet.gtk2reactor.Gtk2Reactor

Undocumented

def _handleSignals(self):

overrides twisted.internet.posixbase.PosixReactorBase._handleSignals

Extend the basic signal handling logic to also support handling SIGCHLD to know when to try to reap child processes.

def input_add(self, source, condition, callback):

Undocumented

def _ioEventCallback(self, source, condition):

Called by event loop when an I/O event occurs.

def _add(self, source, primary, other, primaryFlag, otherFlag):

Add the given FileDescriptor for monitoring either for reading or writing. If the file is already monitored for the other operation, we delete the previous registration and re-register it for both reading and writing.

def addReader(self, reader):

from twisted.internet.interfaces.IReactorFDSet

overrides twisted.internet.base.ReactorBase.addReader

Add a FileDescriptor for monitoring of data available to read.

def addWriter(self, writer):

from twisted.internet.interfaces.IReactorFDSet

overrides twisted.internet.base.ReactorBase.addWriter

Add a FileDescriptor for monitoring ability to write data.

def getReaders(self):

from twisted.internet.interfaces.IReactorFDSet

overrides twisted.internet.base.ReactorBase.getReaders

Retrieve the list of current FileDescriptor monitored for reading.

def getWriters(self):

from twisted.internet.interfaces.IReactorFDSet

overrides twisted.internet.base.ReactorBase.getWriters

Retrieve the list of current FileDescriptor monitored for writing.

def removeAll(self):

from twisted.internet.interfaces.IReactorFDSet

overrides twisted.internet.base.ReactorBase.removeAll

Remove monitoring for all registered FileDescriptors.

def _remove(self, source, primary, other, flags):

Remove monitoring the given FileDescriptor for either reading or writing. If it's still monitored for the other operation, we re-register the FileDescriptor for only that operation.

def removeReader(self, reader):

from twisted.internet.interfaces.IReactorFDSet

overrides twisted.internet.base.ReactorBase.removeReader

Stop monitoring the given FileDescriptor for reading.

def removeWriter(self, writer):

from twisted.internet.interfaces.IReactorFDSet

overrides twisted.internet.base.ReactorBase.removeWriter

Stop monitoring the given FileDescriptor for writing.

def iterate(self, delay=0):

from twisted.internet.interfaces.IReactorCore

overrides twisted.internet.base.ReactorBase.iterate

One iteration of the event loop, for trial's use.