Re: [nox-dev] Threads in Python

Zdravko Bozakov Thu, 22 Apr 2010 02:41:03 -0700

Hi Martin,

after playing around with twisted deferreds and callbacks/errbacks etc., I finally handled my blocking call - used for continuously reading kernel generated packets from a TAP device, and sending these through the OF controller - using twisted's reader functionality (as suggested by Kyle - thanks a lot!). In case someone else is interested in doing something similar, here is some code which got me started:


On 15.04.2010, at 17:58, Kyle Forster wrote:
...

class MyFileReader():
    def __init__(self):
       #open the file
    def doRead(self):
      #read from the file, sending an event back in to nox with
      #inst.post(pyevent(MY_FILE_READER_EVENT, e))
    ...
    #(dumb impementations of doWrite, fileno and connectionLost)

from twisted.internet import reactor
...
   reactor.addReader(MyFileReader())
...

The file reader runs in the background and fires an event whenever new data is available on the file descriptor - very nice! I also came across this blog entry, which has some useful infos about using IReadDescriptor:


http://krondo.com/blog/?p=1445


Best regards,
Zdravko

On 15.04.2010, at 06:26, Martin Casado wrote:

I've not tried using Python threads within Nox. It very well could be broken. You can grep around src/nox/coreapps/pyrt/ to see the reactor implementation within Nox. I would suggest using Twisted event harness and deferred's rather than Python threads.
.martin
Hello *,
I recently started working on a project using NOX. I'm wondering how (if at all) I can use python threads in my controller (I want to use these
to handle a blocking function call). I came across this post, dealing
with a similar problem:

http://www.mail-archive.com/[email protected]/msg00430.html
where it is hinted, that using the twisted framework would be the right approach. So far I've tried (unsuccessfully) using the callInThread and deferToThread functions from twisted. Are these functions implemented in the NOX reactor? Also, is my assumption that reactor.run() is executed
automatically by NOX correct?

I would be very thankful for any pointers!

Best regards,
Zdravko




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Re: [nox-dev] Threads in Python

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