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/usr/lib/python3/dist-packages/twisted/internet/

/usr/lib/python3/dist-packages/twisted/internet

Name	Size	Mode	Actions
iocpreactor/	-	0755	rm
test/	-	0755	rm
__pycache__/	-	0755	rm
abstract.py	19274	0644	edit dl rm
address.py	5246	0644	edit dl rm
asyncioreactor.py	10553	0644	edit dl rm
base.py	44260	0644	edit dl rm
cfreactor.py	17501	0644	edit dl rm
default.py	1942	0644	edit dl rm
defer.py	71193	0644	edit dl rm
endpoints.py	77207	0644	edit dl rm
epollreactor.py	8493	0644	edit dl rm
error.py	12645	0644	edit dl rm
fdesc.py	3223	0644	edit dl rm
gireactor.py	6123	0644	edit dl rm
glib2reactor.py	1115	0644	edit dl rm
gtk2reactor.py	3614	0644	edit dl rm
gtk3reactor.py	2252	0644	edit dl rm
inotify.py	14691	0644	edit dl rm
interfaces.py	96515	0644	edit dl rm
kqreactor.py	10292	0644	edit dl rm
main.py	1054	0644	edit dl rm
pollreactor.py	6026	0644	edit dl rm
posixbase.py	26357	0644	edit dl rm
process.py	38896	0644	edit dl rm
protocol.py	27134	0644	edit dl rm
pyuisupport.py	817	0644	edit dl rm
reactor.py	1863	0644	edit dl rm
selectreactor.py	6215	0644	edit dl rm
serialport.py	2317	0644	edit dl rm
ssl.py	8444	0644	edit dl rm
stdio.py	1045	0644	edit dl rm
task.py	31119	0644	edit dl rm
tcp.py	54908	0644	edit dl rm
threads.py	3953	0644	edit dl rm
tksupport.py	2045	0644	edit dl rm
udp.py	18569	0644	edit dl rm
unix.py	21965	0644	edit dl rm
utils.py	7876	0644	edit dl rm
win32eventreactor.py	15193	0644	edit dl rm
wxreactor.py	5263	0644	edit dl rm
wxsupport.py	1363	0644	edit dl rm
_baseprocess.py	1913	0644	edit dl rm
_dumbwin32proc.py	13107	0644	edit dl rm
_glibbase.py	12813	0644	edit dl rm
_idna.py	1397	0644	edit dl rm
_newtls.py	9332	0644	edit dl rm
_pollingfile.py	8982	0644	edit dl rm
_posixserialport.py	1995	0644	edit dl rm
_posixstdio.py	4687	0644	edit dl rm
_producer_helpers.py	3788	0644	edit dl rm
_resolver.py	8530	0644	edit dl rm
_signals.py	2718	0644	edit dl rm
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_threadedselect.py	11764	0644	edit dl rm
_win32serialport.py	4744	0644	edit dl rm
_win32stdio.py	3204	0644	edit dl rm
__init__.py	521	0644	edit dl rm

Edit: /usr/lib/python3/dist-packages/twisted/internet/epollreactor.py (8493B)

# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
An epoll() based implementation of the twisted main loop.

To install the event loop (and you should do this before any connections,
listeners or connectors are added)::

from twisted.internet import epollreactor
    epollreactor.install()
"""

from __future__ import division, absolute_import

from select import epoll, EPOLLHUP, EPOLLERR, EPOLLIN, EPOLLOUT
import errno

from zope.interface import implementer

from twisted.internet.interfaces import IReactorFDSet

from twisted.python import log
from twisted.internet import posixbase

@implementer(IReactorFDSet)
class EPollReactor(posixbase.PosixReactorBase, posixbase._PollLikeMixin):
    """
    A reactor that uses epoll(7).

@ivar _poller: A C{epoll} which will be used to check for I/O
        readiness.

@ivar _selectables: A dictionary mapping integer file descriptors to
        instances of C{FileDescriptor} which have been registered with the
        reactor.  All C{FileDescriptors} which are currently receiving read or
        write readiness notifications will be present as values in this
        dictionary.

@ivar _reads: A set containing integer file descriptors.  Values in this
        set will be registered with C{_poller} for read readiness notifications
        which will be dispatched to the corresponding C{FileDescriptor}
        instances in C{_selectables}.

@ivar _writes: A set containing integer file descriptors.  Values in this
        set will be registered with C{_poller} for write readiness
        notifications which will be dispatched to the corresponding
        C{FileDescriptor} instances in C{_selectables}.

@ivar _continuousPolling: A L{_ContinuousPolling} instance, used to handle
        file descriptors (e.g. filesystem files) that are not supported by
        C{epoll(7)}.
    """

# Attributes for _PollLikeMixin
    _POLL_DISCONNECTED = (EPOLLHUP | EPOLLERR)
    _POLL_IN = EPOLLIN
    _POLL_OUT = EPOLLOUT

def __init__(self):
        """
        Initialize epoll object, file descriptor tracking dictionaries, and the
        base class.
        """
        # Create the poller we're going to use.  The 1024 here is just a hint
        # to the kernel, it is not a hard maximum.  After Linux 2.6.8, the size
        # argument is completely ignored.
        self._poller = epoll(1024)
        self._reads = set()
        self._writes = set()
        self._selectables = {}
        self._continuousPolling = posixbase._ContinuousPolling(self)
        posixbase.PosixReactorBase.__init__(self)

def _add(self, xer, primary, other, selectables, event, antievent):
        """
        Private method for adding a descriptor from the event loop.

It takes care of adding it if  new or modifying it if already added
        for another state (read -> read/write for example).
        """
        fd = xer.fileno()
        if fd not in primary:
            flags = event
            # epoll_ctl can raise all kinds of IOErrors, and every one
            # indicates a bug either in the reactor or application-code.
            # Let them all through so someone sees a traceback and fixes
            # something.  We'll do the same thing for every other call to
            # this method in this file.
            if fd in other:
                flags |= antievent
                self._poller.modify(fd, flags)
            else:
                self._poller.register(fd, flags)

# Update our own tracking state *only* after the epoll call has
            # succeeded.  Otherwise we may get out of sync.
            primary.add(fd)
            selectables[fd] = xer

def addReader(self, reader):
        """
        Add a FileDescriptor for notification of data available to read.
        """
        try:
            self._add(reader, self._reads, self._writes, self._selectables,
                      EPOLLIN, EPOLLOUT)
        except IOError as e:
            if e.errno == errno.EPERM:
                # epoll(7) doesn't support certain file descriptors,
                # e.g. filesystem files, so for those we just poll
                # continuously:
                self._continuousPolling.addReader(reader)
            else:
                raise

def addWriter(self, writer):
        """
        Add a FileDescriptor for notification of data available to write.
        """
        try:
            self._add(writer, self._writes, self._reads, self._selectables,
                      EPOLLOUT, EPOLLIN)
        except IOError as e:
            if e.errno == errno.EPERM:
                # epoll(7) doesn't support certain file descriptors,
                # e.g. filesystem files, so for those we just poll
                # continuously:
                self._continuousPolling.addWriter(writer)
            else:
                raise

def _remove(self, xer, primary, other, selectables, event, antievent):
        """
        Private method for removing a descriptor from the event loop.

It does the inverse job of _add, and also add a check in case of the fd
        has gone away.
        """
        fd = xer.fileno()
        if fd == -1:
            for fd, fdes in selectables.items():
                if xer is fdes:
                    break
            else:
                return
        if fd in primary:
            if fd in other:
                flags = antievent
                # See comment above modify call in _add.
                self._poller.modify(fd, flags)
            else:
                del selectables[fd]
                # See comment above _control call in _add.
                self._poller.unregister(fd)
            primary.remove(fd)

def removeReader(self, reader):
        """
        Remove a Selectable for notification of data available to read.
        """
        if self._continuousPolling.isReading(reader):
            self._continuousPolling.removeReader(reader)
            return
        self._remove(reader, self._reads, self._writes, self._selectables,
                     EPOLLIN, EPOLLOUT)

def removeWriter(self, writer):
        """
        Remove a Selectable for notification of data available to write.
        """
        if self._continuousPolling.isWriting(writer):
            self._continuousPolling.removeWriter(writer)
            return
        self._remove(writer, self._writes, self._reads, self._selectables,
                     EPOLLOUT, EPOLLIN)

def removeAll(self):
        """
        Remove all selectables, and return a list of them.
        """
        return (self._removeAll(
                [self._selectables[fd] for fd in self._reads],
                [self._selectables[fd] for fd in self._writes]) +
                self._continuousPolling.removeAll())

def getReaders(self):
        return ([self._selectables[fd] for fd in self._reads] +
                self._continuousPolling.getReaders())

def getWriters(self):
        return ([self._selectables[fd] for fd in self._writes] +
                self._continuousPolling.getWriters())

def doPoll(self, timeout):
        """
        Poll the poller for new events.
        """
        if timeout is None:
            timeout = -1  # Wait indefinitely.

try:
            # Limit the number of events to the number of io objects we're
            # currently tracking (because that's maybe a good heuristic) and
            # the amount of time we block to the value specified by our
            # caller.
            l = self._poller.poll(timeout, len(self._selectables))
        except IOError as err:
            if err.errno == errno.EINTR:
                return
            # See epoll_wait(2) for documentation on the other conditions
            # under which this can fail.  They can only be due to a serious
            # programming error on our part, so let's just announce them
            # loudly.
            raise

_drdw = self._doReadOrWrite
        for fd, event in l:
            try:
                selectable = self._selectables[fd]
            except KeyError:
                pass
            else:
                log.callWithLogger(selectable, _drdw, selectable, fd, event)

doIteration = doPoll

def install():
    """
    Install the epoll() reactor.
    """
    p = EPollReactor()
    from twisted.internet.main import installReactor
    installReactor(p)

__all__ = ["EPollReactor", "install"]

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