twisted.internet.gtk2reactor.Gtk2Reactor : API documentation

GTK+-2 event loop reactor.

Notification for I/O events (reads and writes on file descriptors) is done by the 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.

Instance Variables	_sources	A dictionary mapping `FileDescriptor` instances to gtk watch handles.
	_reads	A set of `FileDescriptor` instances currently monitored for reading.
	_writes	A set of `FileDescriptor` instances currently monitored for writing.
	_simtag	A gtk timeout handle for the next `_simulate` call.

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`.
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 _Gtk2SignalMixin:

Method

_handleSignals

Undocumented

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
Method	listenUNIX
Method	listenUNIXDatagram	Connects a given `DatagramProtocol` to the given path.
Method	connectUNIXDatagram	Connects a `ConnectedDatagramProtocol` instance to a path.
Method	listenTCP
Method	connectTCP
Method	connectSSL
Method	listenSSL
Method	listenWith	Undocumented
Method	connectWith	Undocumented
Method	_disconnectSelectable	Utility function for disconnecting a selectable.
Method	_handleSignals	Extend the basic signal handling logic to also support handling SIGCHLD to know when to try to reap child processes.
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
Method	_reallyStartRunning	Extend the base implementation by also installing signal handlers, if `self._installSignalHandlers` is true.

Inherited from ReactorBase (via PosixReactorBase):

Method	installResolver	Set the internal resolver to use to for name lookups.
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	Undocumented
Method	runUntilCurrent	Run all pending timed calls.
Method	callFromThread 0	See `twisted.internet.interfaces.IReactorThreads.callFromThread`.
Method	getThreadPool	See `twisted.internet.interfaces.IReactorThreads.getThreadPool`.
Method	callInThread	See `twisted.internet.interfaces.IReactorThreads.callInThread`.
Method	suggestThreadPoolSize	See `twisted.internet.interfaces.IReactorThreads.suggestThreadPoolSize`.
Method	callFromThread	Cause a function to be executed by the reactor thread.
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 _PollLikeMixin:

Method

_doReadOrWrite

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

t.i.g.Gtk2Reactor(_Gtk2SignalMixin, posixbase.PosixReactorBase, posixbase._PollLikeMixin) : class documentation