Re: Error "signal only works in main thread"

Hi Joel,

thanks for your answer! I implemented a plugin for the optimization 
routines, but it still results in the same error. :/ Are you sure plugins 
run on the main thread?

Please take a look at the code - did I do anything wrong?
https://gist.github.com/anonymous/d955db89c8381d052653

And the error is:

Traceback (most recent call last):
  File "C:\...\pyenv\lib\site-packages\cherrypy\_cprequest.py", line 670, 
in respond
    response.body = self.handler()
  File "C:\...\pyenv\lib\site-packages\cherrypy\lib\encoding.py", line 217, 
in __call__
    self.body = self.oldhandler(*args, **kwargs)
  File "C:\...\pyenv\lib\site-packages\cherrypy\_cpdispatch.py", line 61, 
in __call__
    return self.callable(*self.args, **self.kwargs)
  File "server.py", line 10, in index
    return cherrypy.engine.publish("optimize", {"Amax": 42}).pop()
  File "C:\...\pyenv\lib\site-packages\cherrypy\process\wspbus.py", line 
223, in publish
    raise exc
cherrypy.process.wspbus.ChannelFailures: ValueError('*signal only works in 
main thread*',)

Max

Am Freitag, 11. März 2016 19:23:04 UTC+1 schrieb Joel Rivera:
>
> Create a plugin and publish channels to call the pyomo methods from 
> the main thread, more specifically methods that uses the calls to 
> pyomo. If the problem is limited to `SolverFactory("glpk").solve(m)` 
> then you can just publish a channel to do: 
>
>    result = cherrypy.engine.publish('solve', 'glpk', m).pop() 
>
> The plugins execute at the `cherrypy.engine` level which is the 
> Main-Thread. 
>
> For more information about the plugins/server-wide functions: 
>
> http://docs.cherrypy.org/en/latest/extend.html#server-wide-functions 
>
> Regards 
>
> On Fri, 11 Mar 2016 04:49:29 -0800 (PST) 
> stm <[email protected] <javascript:>> wrote: 
>
> > Hi, 
> > 
> > I'd like to create a simple web API using Cherrypy that can be used 
> > to solve some optimization problem using Pyomo (pyomo.org). 
> > 
> > When Pyomo's solve method is called I get the error "signal only 
> > works in main thread". 
> > 
> > What can I do to make this work? Is it possible to make Cherrypy run 
> > on the main thread? (I know it'd be slower, but don't mind) 
> > 
> > Here's a minimal example to reproduce the problem: 
> > 
> > https://gist.github.com/anonymous/ea94c3c45bbcb71a6850 
> > Thanks! 
> > 
>
> -- 
> Rivera² 
>

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