Hi Juan,
On Thu, 2008-12-04 at 21:07 +0000, Juan Pablo Soto Barrera wrote:
> c) By the way, ... seemingly classes plugin.DaemonPlugin and kaa lack
> support for asynchronous IO; that is, support based on select(2) or
> poll(2) system calls. This (suppossedly) missing capability would
> allow to avoid many solutions based on awful race-conditions of
> threads (forbidden by my psychiatrist) or unnecessary overhead due to
> TCP/UDP inter-process communications to external daemons.
I can't speak to the other stuff, but kaa certainly supports async IO
via the IOMonitor and, more recently, IOChannel classes.
def handle_read(data):
print 'Got %d bytes' % len(datA)
@kaa.timed(1)
def status():
print 'See, mainloop is still alive'
# /dev/random blocks notoriously
f = kaa.IOChannel(file('/dev/random'))
f.signals['read'].connect(handle_read)
status()
kaa.main.run()
Or you could use a coroutine (more elegant):
@kaa.coroutine()
def get_real_random_data():
f = kaa.IOChannel(file('/dev/random'))
while f.alive:
# This syntax requires python 2.5. The coroutine
# yields until data is ready.
data = yield f.read()
print 'Got %d bytes' % len(data)
If you don't want the high-level conveniences added by IOChannel, you
can use IOMonitor, which registers a file descriptor for monitoring and
will invoke a callback when the descriptor becomes readable or writable.
(This uses select internally.)
Cheers,
Jason.
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