Its getting kind of late and my eyes are getting tired so I wanted to throw
up this problem I am having and see if I can get some feedback on what might
be going wrong here.
I built boost::python into my app and exported a bunch of stuff. All is
well when I just call functions and do not much at all (the example apps all
work for example).
However, when I start actually trying to use the features of my library I
crash python.
In debug mode I get a ton of "PyThreadState_Get: no current thread" messages
printed before it crashes from what I assume is a stack overflow. In
release mode it just crashes.
Both crash while executing
Py_ALLOW_RECURSION
t = PyDict_GetItem(interned, (PyObject *)s);
Py_END_ALLOW_RECURSION
in unicodeobject.c line 9725
The stack trace once the program enters the python dll looks like this
(going bottom to up)
python31_d.dll!Py_FatalError(const char * msg=0x000007fef0c350f8) Line
2013 + 0x5 bytes C
python31_d.dll!PyThreadState_Get() Line 351 C
python31_d.dll!PyErr_Occurred() Line 133 + 0x5 bytes C
python31_d.dll!Py_FatalError(const char * msg=0x000007fef0c350f8) Line
2013 + 0x5 bytes C
python31_d.dll!PyThreadState_Get() Line 351 C
python31_d.dll!PyUnicode_InternInPlace(_object * *
p=0x000000000330ef18) Line 9725 + 0x5 bytes C
python31_d.dll!PyUnicode_InternFromString(const char *
cp=0x000007fef113ef28) Line 9766 C
python31_d.dll!PyObject_GetAttrString(_object * v=0x000000000245f658,
const char * name=0x000007fef113ef28) Line 751 + 0xa bytes C
i have a suspicion about what may be causing this error but I am afraid I do
not know enough about python to know for sure, so here where you guys come
in :)
My program ( that python is controlling ) is multithreaded.
I am thinking that one of the other program threads is calling a python
method and that is what is causing this crash.
I am using the observer pattern in my design and I have a python object that
I attach to an object to watch for changes. When the object is changed, my
python code should get executed. The notify method to tell all the
observers there was a change could get called from a separate thread.
I am pretty sure I have wrapped the classes and definitions correctly to
allow this to happen thanks to the boost::python doc. So my question is,
would calling python code from a thread other than the main thread cause
this problem? And if so, how can I fix this?
Thank you for your time
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