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Re: embedding ipython kernel in a thread

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  Re: embedding ipython kernel in a thread Carlos Anselmo Dias <carlos@premium-sponsor.com> - 2014-06-09 14:34 +0100

#73026 — Re: embedding ipython kernel in a thread

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On 06/09/2014 01:59 PM, Gelonida N wrote:
> Hi,
>
> I'd like to embed an ipython kernel in an appliction, such, that I can 
> use
>
> ipython console --existing kernel-<pid>.json lateron to connect to it 
> and to look at some values
>
>
> Due to various reason I don not want to start it in the main thread.
>
> If you look at following example you will see, that I can start an 
> ipython kernel and
> connect to it as long as I start it in the main thread.
>
> as soon as I start the kernel in another thread my ipython client 
> prints  the first few lines and a welcome text, but
> no prompt is shown.
>
> Does anybody know a way o how to start IPython outside of the main 
> thread?
>
>
> Below code trying to show a working setup with ipython kernel in the 
> main thread and failing if ipython kernel is started from another thread
>
> #!/usr/bin/env python
> import os, time, threading
> from IPython import embed_kernel
>
> cnt  = { 'value' : 0 }
> def run_ip_kernel():
>     embed_kernel(local_ns={ 'cnt': cnt})
>
> def example_thread():
>     while True:
>         cnt['value'] += 1
>         print(cnt['value'])
>         time.sleep(5)
>
> main_thread = run_ip_kernel
> other_thread = example_thread
>
> # if I uncomment the next two lines, then I can no more
> # execute my interactive IPython shell
> #main_thread = example_thread
> #other_thread = run_ip_kernel
>
> print("now you can try to connect to this shell with:")
> print("ipython console --existing kernel-%d.json" % os.getpid())
> threading.Thread(target=other_thread).start()
> main_thread()
>
>

Whatever you're trying to do(...) ... if you look at the script I 
provide you in attach and if you can think how usefull it would be to 
control exponencially what you need ... that's certainly one best 
approach ...

https://www.youtube.com/watch?v=p7CaiWxKYBo

Regards,
Carlos

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