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<== Date ==> <== Thread ==>

Subject: Cothread release 2-12
From: <michael.abbott@diamond.ac.uk>
To: <tech-talk@aps.anl.gov>
Date: Thu, 2 Oct 2014 09:23:11 +0000

Forever ago (the beginning of the year) Michael Davidsaver sent me a long series of patches to cothread to improve the behaviour of the built-in Python socket libraries when using cothread (and to add some useful tests).  These patches were merged into the git repository (available by cloning http://controls.diamond.ac.uk/downloads/python/cothread/cothread.git and now available on github at https://github.com/Araneidae/cothread ) in April ... but I have been rather distracted with other work until now, so the release of this work has been delayed.

 

So, I would like to belatedly announce the release of cothread version 2-12, available at http://controls.diamond.ac.uk/downloads/python/cothread/  and apologise to Michael for putting this off for so long.

 

 

Michael has also made some detailed proposals for allowing each thread to run its own cothread interpreter.  Up to now it’s not been very clear to me what users would require of such a system.  I presume the most important requirement would be that cothread.catools channel access operations can be performed from any thread.  Given the recent conversation on this topic it now seems a good time to make some progress on this (with further apologies to Michael for further putting off!)

 

I have a handful of questions, with suggested answers:

 

·         When camonitor is called, which thread is used for the callback?  I would suggest that the thread which called camonitor is always used for the callback.

·         Can a cothread waiting for an event on one thread be woken by a signal generated by another thread?  This is probably straightforward enough to achieve and might be very valuable.  This can already be achieved with the Callback() method, but we’d like this to be transparent.

·         Can a cothread be allowed to migrate from one thread to another?  Please say no, this is a scary idea, the implementation implications are already giving me the heebie-jeebies.


 

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