Error "signal only works in main thread"

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

The full error message 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 "cherryerror.py", line 14, in index
    result = SolverFactory("glpk").solve(m)
  File "C:\...\pyenv\lib\site-packages\pyomo\opt\base\solvers.py", line 
557, in solve
    _status = self._apply_solver()
  File "C:\...\pyenv\lib\site-packages\pyomo\opt\solver\shellcmd.py", line 
135, in _apply_solver
    self._rc, self._log = self._execute_command(self._command)
  File "C:\...\pyenv\lib\site-packages\pyomo\opt\solver\shellcmd.py", line 
195, in _execute_command
    tee   = self._tee
  File "C:\...\pyenv\lib\site-packages\pyutilib\subprocess\processmngr.py", 
line 455, in run_command
    signal.signal(signal.SIGINT, verbose_signal_handler)
*ValueError: signal only works in main thread*

Thanks!

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