Commit 565fe4c4 authored by Guido Trotter's avatar Guido Trotter
Browse files

Simplify IO waiting in Mainloop

IO is never unregistered in our current usage, so dropping that
functionality for now. Also putting the poller outside of the Run()
function allows us to avoid the double step of adding tuples to an
_io_wait_add queue and adding them later in the main loop.
Signed-off-by: default avatarGuido Trotter <>
Reviewed-by: default avatarIustin Pop <>
parent 577c90a3
......@@ -41,9 +41,8 @@ class Mainloop(object):
self._io_wait = {}
self._io_wait_add = []
self._io_wait_remove = []
self._signal_wait = []
self._poller = select.poll()
def Run(self, handle_sigchld=True, handle_sigterm=True, stop_on_empty=False):
"""Runs the mainloop.
......@@ -57,8 +56,6 @@ class Mainloop(object):
poller = select.poll()
# Setup signal handlers
if handle_sigchld:
sigchld_handler = utils.SignalHandler([signal.SIGCHLD])
......@@ -75,33 +72,13 @@ class Mainloop(object):
# Start actual main loop
while running:
# Entries could be added again afterwards, hence removing first
if self._io_wait_remove:
for fd in self._io_wait_remove:
except KeyError:
del self._io_wait[fd]
except KeyError:
self._io_wait_remove = []
# Add new entries
if self._io_wait_add:
for (owner, fd, conditions) in self._io_wait_add:
self._io_wait[fd] = owner
poller.register(fd, conditions)
self._io_wait_add = []
# Stop if nothing is listening anymore
if stop_on_empty and not (self._io_wait):
# Wait for I/O events
io_events = poller.poll(None)
io_events = self._poller.poll(None)
except select.error, err:
# EINTR can happen when signals are sent
if err.args and err.args[0] in (errno.EINTR,):
......@@ -161,22 +138,8 @@ class Mainloop(object):
assert isinstance(fd, (int, long)), \
"Only integers are supported for file descriptors"
self._io_wait_add.append((owner, fd, condition))
def UnregisterIO(self, fd):
"""Unregister a file descriptor.
It'll be unregistered the next time the mainloop checks for it.
@type fd: int
@param fd: File descriptor
# select.Poller also supports file() like objects, but we don't.
assert isinstance(fd, (int, long)), \
"Only integers are supported for file descriptors"
self._io_wait[fd] = owner
self._poller.register(fd, condition)
def RegisterSignal(self, owner):
"""Registers a receiver for signal notifications
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