def PythonRuntimeCall(self, methodname, use_evaluator=True, reverse_order=False):
"""
Calls init, start, stop or cleanup method provided by
runtime python files, loaded when new PLC uploaded
"""
methods = self.python_runtime_vars.get("_runtime_%s" % methodname, [])
if reverse_order:
methods = reversed(methods)
for method in methods:
if use_evaluator:
_res, exp = self.evaluator(method)
else:
_res, exp = default_evaluator(method)
if exp is not None:
self.LogMessage(0, '\n'.join(traceback.format_exception(*exp)))
def evaluator(tocall, *args, **kwargs):
# To prevent deadlocks, check if current thread is not one of the UI
# UI threads can be either the one from WX main loop or
# worker thread from twisted "threadselect" reactor
current_id = currentThread().ident
if ui_thread is not None \
and ui_thread.ident != current_id \
and (not havetwisted or (
twisted_reactor_thread_id is not None
and twisted_reactor_thread_id != current_id)):
o = type('', (object, ), dict(call=(tocall, args, kwargs),
res=None))
wx.CallAfter(wx_evaluator, o)
wx_eval_lock.acquire()
return o.res
else:
# avoid dead lock if called from the wx mainloop
return default_evaluator(tocall, *args, **kwargs)
def wx_evaluator(obj, *args, **kwargs):
tocall, args, kwargs = obj.call
obj.res = default_evaluator(tocall, *args, **kwargs)
wx_eval_lock.release()