def poll(self, fd, read=False, write=False, exc=False, timeout=None):
"""Suspend the current task until an IO event occurs."""
expires = None if timeout is None else time.time() + timeout
if hasattr(fd, 'fileno'):
fd = fd.fileno()
wait = FDWait(greenlet.getcurrent(), fd, read, write, exc, expires)
self.fdwaits.add(wait)
if timeout is not None:
self._add_timeout(wait)
self.greenlet.switch()
def _wait_for_pop(self, timeout):
"""Suspend the current task until a pop happens.
Call this if appending to a full Queue.
"""
expires = None if timeout is None else time.time() + timeout
wait = PopWait(greenlet.getcurrent(), self, expires)
if timeout is not None:
self.hub._add_timeout(wait)
self._pop_waits.append(wait)
self.hub.run()
def _wait_for_append(self, timeout):
"""Suspend the current task until an append happens.
Call this if popping from an empty Queue.
"""
expires = None if timeout is None else time.time() + timeout
wait = AppendWait(greenlet.getcurrent(), self, expires)
if timeout is not None:
self.hub._add_timeout(wait)
self._append_waits.append(wait)
self.hub.run()
def wait_until_empty(self, timeout=None):
"""Suspend the current task until the Queue is empty.
>>> q = Queue()
>>> q.wait_until_empty()
>>> q.append('an item')
>>> q.wait_until_empty(0)
Traceback (most recent call last):
...
Timeout
"""
if not self.queue:
return
expires = None if timeout is None else time.time() + timeout
wait = PopWait(greenlet.getcurrent(), self, expires)
if timeout is not None:
self.hub._add_timeout(wait)
while self.queue:
self._pop_waits.append(wait)
self.hub.run()
self._popped()
def switch(self):
"""Reschedule the current task, and run the event-loop."""
self.schedule(greenlet.getcurrent())
self.greenlet.switch()
def sleep(self, timeout):
"""Suspend the current task for the specified number of seconds."""
expires = time.time() + timeout
sleep = Sleep(greenlet.getcurrent(), expires)
self._add_timeout(sleep)
self.greenlet.switch()