def doWaitForMultipleEvents(self, timeout): log.msg(channel='system', event='iteration', reactor=self) if timeout is None: #timeout = INFINITE timeout = 100 else: timeout = int(timeout * 1000) if not (self._events or self._writes): # sleep so we don't suck up CPU time time.sleep(timeout / 1000.0) return canDoMoreWrites = 0 for fd in self._writes.keys(): if log.callWithLogger(fd, self._runWrite, fd): canDoMoreWrites = 1 if canDoMoreWrites: timeout = 0 handles = self._events.keys() or [self.dummyEvent] val = MsgWaitForMultipleObjects(handles, 0, timeout, QS_ALLINPUT | QS_ALLEVENTS) if val == WAIT_TIMEOUT: return elif val == WAIT_OBJECT_0 + len(handles): exit = win32gui.PumpWaitingMessages() if exit: self.callLater(0, self.stop) return elif val >= WAIT_OBJECT_0 and val < WAIT_OBJECT_0 + len(handles): fd, action = self._events[handles[val - WAIT_OBJECT_0]] log.callWithLogger(fd, self._runAction, action, fd)
def disconnectAll(self): """Disconnect every reader, and writer in the system. """ selectables = self.removeAll() for reader in selectables: log.callWithLogger(reader, reader.connectionLost, failure.Failure(main.CONNECTION_LOST))
def doIteration(self, timeout): # This function sits and waits for an IO completion event. # # There are two requirements: process IO events as soon as they arrive # and process ctrl-break from the user in a reasonable amount of time. # # There are three kinds of waiting. # 1) GetQueuedCompletionStatus (self.port.getEvent) to wait for IO # events only. # 2) Msg* family of wait functions that can stop waiting when # ctrl-break is detected (then, I think, Python converts it into a # KeyboardInterrupt) # 3) *Ex family of wait functions that put the thread into an # "alertable" wait state which is supposedly triggered by IO completion # # 2) and 3) can be combined. Trouble is, my IO completion is not # causing 3) to trigger, possibly because I do not use an IO completion # callback. Windows is weird. # There are two ways to handle this. I could use MsgWaitForSingleObject # here and GetQueuedCompletionStatus in a thread. Or I could poll with # a reasonable interval. Guess what! Threads are hard. processed_events = 0 if timeout is None: timeout = MAX_TIMEOUT else: timeout = min(MAX_TIMEOUT, int(1000*timeout)) rc, bytes, key, evt = self.port.getEvent(timeout) while processed_events < EVENTS_PER_LOOP: if rc == WAIT_TIMEOUT: break if key != KEY_WAKEUP: assert key == KEY_NORMAL if not evt.ignore: log.callWithLogger(evt.owner, self._callEventCallback, rc, bytes, evt) processed_events += 1 rc, bytes, key, evt = self.port.getEvent(0)
def doIteration(self, timeout):
# This function sits and waits for an IO completion event.
#
# There are two requirements: process IO events as soon as they arrive
# and process ctrl-break from the user in a reasonable amount of time.
#
# There are three kinds of waiting.
# 1) GetQueuedCompletionStatus (self.port.getEvent) to wait for IO
# events only.
# 2) Msg* family of wait functions that can stop waiting when
# ctrl-break is detected (then, I think, Python converts it into a
# KeyboardInterrupt)
# 3) *Ex family of wait functions that put the thread into an
# "alertable" wait state which is supposedly triggered by IO completion
#
# 2) and 3) can be combined. Trouble is, my IO completion is not
# causing 3) to trigger, possibly because I do not use an IO completion
# callback. Windows is weird.
# There are two ways to handle this. I could use MsgWaitForSingleObject
# here and GetQueuedCompletionStatus in a thread. Or I could poll with
# a reasonable interval. Guess what! Threads are hard.
processed_events = 0
if timeout is None:
timeout = MAX_TIMEOUT
else:
timeout = min(MAX_TIMEOUT, int(1000 * timeout))
rc, bytes, key, evt = self.port.getEvent(timeout)
while processed_events < EVENTS_PER_LOOP:
if rc == WAIT_TIMEOUT:
break
if key != KEY_WAKEUP:
assert key == KEY_NORMAL
if not evt.ignore:
log.callWithLogger(evt.owner, self._callEventCallback, rc,
bytes, evt)
processed_events += 1
rc, bytes, key, evt = self.port.getEvent(0)
def callback(self, source, condition): log.callWithLogger(source, self._readAndWrite, source, condition) self.simulate() # fire Twisted timers return 1 # 1=don't auto-remove the source
class KQueueReactor(posixbase.PosixReactorBase):
"""
A reactor that uses kqueue(2)/kevent(2).
@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 dictionary mapping integer file descriptors to arbitrary
values (this is essentially a set). Keys in this dictionary 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 dictionary mapping integer file descriptors to arbitrary
values (this is essentially a set). Keys in this dictionary 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)
def __init__(self):
"""
Initialize kqueue object, file descriptor tracking dictionaries, and the
base class.
"""
self._kq = kqueue()
self._reads = {}
self._writes = {}
self._selectables = {}
posixbase.PosixReactorBase.__init__(self)
def _updateRegistration(self, *args):
self._kq.kevent([kevent(*args)], 0, 0)
def addReader(self, reader):
"""Add a FileDescriptor for notification of data available to read.
"""
fd = reader.fileno()
if fd not in self._reads:
self._selectables[fd] = reader
self._reads[fd] = 1
self._updateRegistration(fd, EVFILT_READ, EV_ADD)
def addWriter(self, writer):
"""Add a FileDescriptor for notification of data available to write.
"""
fd = writer.fileno()
if fd not in self._writes:
self._selectables[fd] = writer
self._writes[fd] = 1
self._updateRegistration(fd, EVFILT_WRITE, EV_ADD)
def removeReader(self, reader):
"""Remove a Selectable for notification of data available to read.
"""
fd = reader.fileno()
if fd in self._reads:
del self._reads[fd]
if fd not in self._writes:
del self._selectables[fd]
self._updateRegistration(fd, EVFILT_READ, EV_DELETE)
def removeWriter(self, writer):
"""Remove a Selectable for notification of data available to write.
"""
fd = writer.fileno()
if fd in self._writes:
del self._writes[fd]
if fd not in self._reads:
del self._selectables[fd]
self._updateRegistration(fd, EVFILT_WRITE, EV_DELETE)
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])
def getReaders(self):
return [self._selectables[fd] for fd in self._reads]
def getWriters(self):
return [self._selectables[fd] for fd in self._writes]
def doKEvent(self, timeout):
"""Poll the kqueue for new events."""
if timeout is None:
timeout = 1000
else:
timeout = int(timeout * 1000) # convert seconds to milliseconds
try:
l = self._kq.kevent([], len(self._selectables), timeout)
except OSError, e:
if e[0] == errno.EINTR:
return
else:
raise
_drdw = self._doWriteOrRead
for event in l:
why = None
fd, filter = event.ident, event.filter
try:
selectable = self._selectables[fd]
except KeyError:
# Handles the infrequent case where one selectable's
# handler disconnects another.
continue
log.callWithLogger(selectable, _drdw, selectable, fd, filter)
class EPollReactor(posixbase.PosixReactorBase):
"""
A reactor that uses epoll(4).
@ivar _poller: A L{poll} 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 dictionary mapping integer file descriptors to arbitrary
values (this is essentially a set). Keys in this dictionary will be
registered with C{_poller} for read readiness notifications which will
be dispatched to the corresponding L{FileDescriptor} instances in
C{_selectables}.
@ivar _writes: A dictionary mapping integer file descriptors to arbitrary
values (this is essentially a set). Keys in this dictionary will be
registered with C{_poller} for write readiness notifications which will
be dispatched to the corresponding L{FileDescriptor} instances in
C{_selectables}.
"""
implements(IReactorFDSet)
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.
self._poller = _epoll.epoll(1024)
self._reads = {}
self._writes = {}
self._selectables = {}
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:
cmd = _epoll.CTL_ADD
flags = event
if fd in other:
flags |= antievent
cmd = _epoll.CTL_MOD
# 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.
self._poller._control(cmd, fd, flags)
# Update our own tracking state *only* after the epoll call has
# succeeded. Otherwise we may get out of sync.
primary[fd] = 1
selectables[fd] = xer
def addReader(self, reader):
"""
Add a FileDescriptor for notification of data available to read.
"""
self._add(reader, self._reads, self._writes, self._selectables,
_epoll.IN, _epoll.OUT)
def addWriter(self, writer):
"""
Add a FileDescriptor for notification of data available to write.
"""
self._add(writer, self._writes, self._reads, self._selectables,
_epoll.OUT, _epoll.IN)
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:
cmd = _epoll.CTL_DEL
flags = event
if fd in other:
flags = antievent
cmd = _epoll.CTL_MOD
else:
del selectables[fd]
del primary[fd]
# See comment above _control call in _add.
self._poller._control(cmd, fd, flags)
def removeReader(self, reader):
"""
Remove a Selectable for notification of data available to read.
"""
self._remove(reader, self._reads, self._writes, self._selectables,
_epoll.IN, _epoll.OUT)
def removeWriter(self, writer):
"""
Remove a Selectable for notification of data available to write.
"""
self._remove(writer, self._writes, self._reads, self._selectables,
_epoll.OUT, _epoll.IN)
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])
def getReaders(self):
return [self._selectables[fd] for fd in self._reads]
def getWriters(self):
return [self._selectables[fd] for fd in self._writes]
def doPoll(self, timeout):
"""
Poll the poller for new events.
"""
if timeout is None:
timeout = 1
timeout = int(timeout * 1000) # convert seconds to milliseconds
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.wait(len(self._selectables), timeout)
except IOError, 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)
def callback(self, source, condition): log.callWithLogger(source, self._doReadOrWrite, source, condition) self.simulate() # fire Twisted timers return 1 # 1=don't auto-remove the source
class PollReactor(posixbase.PosixReactorBase):
"""
A reactor that uses poll(2).
@ivar _poller: A L{poll} 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 dictionary mapping integer file descriptors to arbitrary
values (this is essentially a set). Keys in this dictionary will be
registered with C{_poller} for read readiness notifications which will
be dispatched to the corresponding L{FileDescriptor} instances in
C{_selectables}.
@ivar _writes: A dictionary mapping integer file descriptors to arbitrary
values (this is essentially a set). Keys in this dictionary will be
registered with C{_poller} for write readiness notifications which will
be dispatched to the corresponding L{FileDescriptor} instances in
C{_selectables}.
"""
implements(IReactorFDSet)
def __init__(self):
"""
Initialize polling object, file descriptor tracking dictionaries, and
the base class.
"""
self._poller = poll()
self._selectables = {}
self._reads = {}
self._writes = {}
posixbase.PosixReactorBase.__init__(self)
def _updateRegistration(self, fd):
"""Register/unregister an fd with the poller."""
try:
self._poller.unregister(fd)
except KeyError:
pass
mask = 0
if fd in self._reads:
mask = mask | POLLIN
if fd in self._writes:
mask = mask | POLLOUT
if mask != 0:
self._poller.register(fd, mask)
else:
if fd in self._selectables:
del self._selectables[fd]
def _dictRemove(self, selectable, mdict):
try:
# the easy way
fd = selectable.fileno()
# make sure the fd is actually real. In some situations we can get
# -1 here.
mdict[fd]
except:
# the hard way: necessary because fileno() may disappear at any
# moment, thanks to python's underlying sockets impl
for fd, fdes in self._selectables.items():
if selectable is fdes:
break
else:
# Hmm, maybe not the right course of action? This method can't
# fail, because it happens inside error detection...
return
if fd in mdict:
del mdict[fd]
self._updateRegistration(fd)
def addReader(self, reader):
"""Add a FileDescriptor for notification of data available to read.
"""
fd = reader.fileno()
if fd not in self._reads:
self._selectables[fd] = reader
self._reads[fd] = 1
self._updateRegistration(fd)
def addWriter(self, writer):
"""Add a FileDescriptor for notification of data available to write.
"""
fd = writer.fileno()
if fd not in self._writes:
self._selectables[fd] = writer
self._writes[fd] = 1
self._updateRegistration(fd)
def removeReader(self, reader):
"""Remove a Selectable for notification of data available to read.
"""
return self._dictRemove(reader, self._reads)
def removeWriter(self, writer):
"""Remove a Selectable for notification of data available to write.
"""
return self._dictRemove(writer, self._writes)
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])
def doPoll(self, timeout):
"""Poll the poller for new events."""
if timeout is not None:
timeout = int(timeout * 1000) # convert seconds to milliseconds
try:
l = self._poller.poll(timeout)
except SelectError, e:
if e[0] == errno.EINTR:
return
else:
raise
_drdw = self._doReadOrWrite
for fd, event in l:
try:
selectable = self._selectables[fd]
except KeyError:
# Handles the infrequent case where one selectable's
# handler disconnects another.
continue
log.callWithLogger(selectable, _drdw, selectable, fd, event)
def disconnectAll(self):
"""Disconnect every reader, and writer in the system.
"""
selectables = self.removeAll()
for reader in selectables:
log.callWithLogger(reader, reader.connectionLost, failure.Failure(main.CONNECTION_LOST))
