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Current File : /proc/self/root/proc/self/root/usr/lib/python2.7/dist-packages/twisted/internet/kqreactor.py
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
A kqueue()/kevent() based implementation of the Twisted main loop.

To use this reactor, start your application specifying the kqueue reactor::

   twistd --reactor kqueue ...

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

   from twisted.internet import kqreactor
   kqreactor.install()

This implementation depends on Python 2.6 or higher which has kqueue support
built in the select module.

Note, that you should use Python 2.6.5 or higher, since previous implementations
of select.kqueue had U{http://bugs.python.org/issue5910} not yet fixed.
"""

import errno

from zope.interface import implements

from select import kqueue, kevent
from select import KQ_FILTER_READ, KQ_FILTER_WRITE
from select import KQ_EV_DELETE, KQ_EV_ADD, KQ_EV_EOF

from twisted.internet.interfaces import IReactorFDSet, IReactorDaemonize

from twisted.python import log, failure
from twisted.internet import main, posixbase


class KQueueReactor(posixbase.PosixReactorBase):
    """
    A reactor that uses kqueue(2)/kevent(2) and relies on Python 2.6 or higher
    which has built in support for kqueue in the select module.

    @ivar _kq: A L{kqueue} which will be used to check for I/O readiness.

    @ivar _selectables: A dictionary mapping integer file descriptors to
        instances of L{FileDescriptor} which have been registered with the
        reactor.  All L{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{_kq} for read readiness notifications
        which will be dispatched to the corresponding L{FileDescriptor}
        instances in C{_selectables}.

    @ivar _writes: A set containing integer file descriptors.  Values in this
        set will be registered with C{_kq} for write readiness notifications
        which will be dispatched to the corresponding L{FileDescriptor}
        instances in C{_selectables}.
    """
    implements(IReactorFDSet, IReactorDaemonize)


    def __init__(self):
        """
        Initialize kqueue object, file descriptor tracking dictionaries, and the
        base class.

        See:
            - http://docs.python.org/library/select.html
            - www.freebsd.org/cgi/man.cgi?query=kqueue
            - people.freebsd.org/~jlemon/papers/kqueue.pdf
        """
        self._kq = kqueue()
        self._reads = set()
        self._writes = set()
        self._selectables = {}
        posixbase.PosixReactorBase.__init__(self)


    def _updateRegistration(self, fd, filter, op):
        """
        Private method for changing kqueue registration on a given FD
        filtering for events given filter/op. This will never block and
        returns nothing.
        """
        self._kq.control([kevent(fd, filter, op)], 0, 0)


    def beforeDaemonize(self):
        """
        Implement L{IReactorDaemonize.beforeDaemonize}.
        """
        # Twisted-internal method called during daemonization (when application
        # is started via twistd). This is called right before the magic double
        # forking done for daemonization. We cleanly close the kqueue() and later
        # recreate it. This is needed since a) kqueue() are not inherited across
        # forks and b) twistd will create the reactor already before daemonization
        # (and will also add at least 1 reader to the reactor, an instance of
        # twisted.internet.posixbase._UnixWaker).
        #
        # See: twisted.scripts._twistd_unix.daemonize()
        self._kq.close()
        self._kq = None


    def afterDaemonize(self):
        """
        Implement L{IReactorDaemonize.afterDaemonize}.
        """
        # Twisted-internal method called during daemonization. This is called right
        # after daemonization and recreates the kqueue() and any readers/writers
        # that were added before. Note that you MUST NOT call any reactor methods
        # in between beforeDaemonize() and afterDaemonize()!
        self._kq = kqueue()
        for fd in self._reads:
            self._updateRegistration(fd, KQ_FILTER_READ, KQ_EV_ADD)
        for fd in self._writes:
            self._updateRegistration(fd, KQ_FILTER_WRITE, KQ_EV_ADD)


    def addReader(self, reader):
        """
        Implement L{IReactorFDSet.addReader}.
        """
        fd = reader.fileno()
        if fd not in self._reads:
            try:
                self._updateRegistration(fd, KQ_FILTER_READ, KQ_EV_ADD)
            except OSError:
                pass
            finally:
                self._selectables[fd] = reader
                self._reads.add(fd)


    def addWriter(self, writer):
        """
        Implement L{IReactorFDSet.addWriter}.
        """
        fd = writer.fileno()
        if fd not in self._writes:
            try:
                self._updateRegistration(fd, KQ_FILTER_WRITE, KQ_EV_ADD)
            except OSError:
                pass
            finally:
                self._selectables[fd] = writer
                self._writes.add(fd)


    def removeReader(self, reader):
        """
        Implement L{IReactorFDSet.removeReader}.
        """
        wasLost = False
        try:
            fd = reader.fileno()
        except:
            fd = -1
        if fd == -1:
            for fd, fdes in self._selectables.items():
                if reader is fdes:
                    wasLost = True
                    break
            else:
                return
        if fd in self._reads:
            self._reads.remove(fd)
            if fd not in self._writes:
                del self._selectables[fd]
            if not wasLost:
                try:
                    self._updateRegistration(fd, KQ_FILTER_READ, KQ_EV_DELETE)
                except OSError:
                    pass


    def removeWriter(self, writer):
        """
        Implement L{IReactorFDSet.removeWriter}.
        """
        wasLost = False
        try:
            fd = writer.fileno()
        except:
            fd = -1
        if fd == -1:
            for fd, fdes in self._selectables.items():
                if writer is fdes:
                    wasLost = True
                    break
            else:
                return
        if fd in self._writes:
            self._writes.remove(fd)
            if fd not in self._reads:
                del self._selectables[fd]
            if not wasLost:
                try:
                    self._updateRegistration(fd, KQ_FILTER_WRITE, KQ_EV_DELETE)
                except OSError:
                    pass


    def removeAll(self):
        """
        Implement L{IReactorFDSet.removeAll}.
        """
        return self._removeAll(
            [self._selectables[fd] for fd in self._reads],
            [self._selectables[fd] for fd in self._writes])


    def getReaders(self):
        """
        Implement L{IReactorFDSet.getReaders}.
        """
        return [self._selectables[fd] for fd in self._reads]


    def getWriters(self):
        """
        Implement L{IReactorFDSet.getWriters}.
        """
        return [self._selectables[fd] for fd in self._writes]


    def doKEvent(self, timeout):
        """
        Poll the kqueue for new events.
        """
        if timeout is None:
            timeout = 1

        try:
            l = self._kq.control([], len(self._selectables), timeout)
        except OSError, e:
            if e[0] == errno.EINTR:
                return
            else:
                raise

        _drdw = self._doWriteOrRead
        for event in l:
            fd = event.ident
            try:
                selectable = self._selectables[fd]
            except KeyError:
                # Handles the infrequent case where one selectable's
                # handler disconnects another.
                continue
            else:
                log.callWithLogger(selectable, _drdw, selectable, fd, event)


    def _doWriteOrRead(self, selectable, fd, event):
        """
        Private method called when a FD is ready for reading, writing or was
        lost. Do the work and raise errors where necessary.
        """
        why = None
        inRead = False
        (filter, flags, data, fflags) = (
            event.filter, event.flags, event.data, event.fflags)

        if flags & KQ_EV_EOF and data and fflags:
            why = main.CONNECTION_LOST
        else:
            try:
                if selectable.fileno() == -1:
                    inRead = False
                    why = posixbase._NO_FILEDESC
                else:
                   if filter == KQ_FILTER_READ:
                       inRead = True
                       why = selectable.doRead()
                   if filter == KQ_FILTER_WRITE:
                       inRead = False
                       why = selectable.doWrite()
            except:
                # Any exception from application code gets logged and will
                # cause us to disconnect the selectable.
                why = failure.Failure()
                log.err(why, "An exception was raised from application code" \
                             " while processing a reactor selectable")

        if why:
            self._disconnectSelectable(selectable, why, inRead)

    doIteration = doKEvent


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


__all__ = ["KQueueReactor", "install"]

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