[PyOpenGL-Users] Loading PyOpenGL from embedded Python interpreter
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[PyOpenGL-Users] Loading PyOpenGL from embedded Python interpreter
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From: Patrick H. <pa...@vr...> - 2003-04-25 11:59:54
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[Note: This is a reposting of a message I misdirected to pyopengl-devel
last night. I apologize for the reposting, but I wanted to be sure this
reaches the right audience.]
My group is having some problems trying to load a Python module that
uses PyOpenGL (2.0.0.44) from C++ code that includes an embedded Python
interpreter. This is happening on Red Hat Linux 8 and FreeBSD 5.
The first issue we ran into was unresolved Python/C symbols in various
.so files in the PyOpenGL installation. I attempted to fix this by
changing the PyOpenGL build so that all the .so's are linked with
-lpython2.2 and -lutil. This appears to address the unresovled symbol
problem, but now I have a new problem that I can't seem to figure out.
When I run the C++ application that loads the Python module, I get this
error:
Fatal Python error: Interpreter not initialized (version mismatch?)
I am certain that the interpreter is initialized because I added an
assertion that calls Py_IsInitialized() immediately before trying to
load the Python module. However, within OpenGL/GL/__init___.so,
Py_IsInitialized() is invoked by Py_InitModule4(), and here,
Py_IsInitialized() returns false. I am not sure why this is, but I have
a theory.
In Python 2.2.2 (and in most other versions, I presume), there is a
static variable that is used to keep track of whether the interpreter is
initialized (see Python-2.2.2/Python/pythonrun.c). If there were
different verions of that static variable in memory, there would be
problems in determining whether the interpreter is actually initialized.
On FreeBSD and Red Hat Linux, there is no dynamically loadable version
of the Python runtime library--it only exists as libpython2.2.a. With
the code I am using and the rebuilt PyOpenGL, there are at least
two--possibly three--places where libpython2.2.a is linked. One is our
C++ code since it is using the Python/C API, and the other is in my
build of PyOpenGL's .so files. The third place is in Boost.Python, the
library we're using to help our C++ code talk to Python. All of those
PyOpenGL .so files are loaded at runtime, so is it possible that the
runtime loader isn't handling the symbol resolution correctly? In other
words, is the runtime loader allowing the existence two or more versions
of various static variables within libpython2.2.a? I'm not an expert in
how linkers or loaders work, so I could be way off here. I have read a
little bit saying that Python modules in C and C++ may not get along
well unless they are both linked with a C++ compiler, and my next effort
is going to be linking the PyOpenGL .so's with a C++ compiler.
There are many more details I am leaving out, but I'm trying to include
only the relevant pieces in hopes of zeroing in on a solution more
quickly. To cause the crash, however, it is sufficient for the Python
module loaded at runtime by the C++ code to be only the following:
from OpenGL.GL import *
The (Boost.Python) code that is doing the module loading looks like this:
std::string module("someModule");
python::handle<>
cur_name(python::borrowed(PyString_FromString(module.c_str())));
python::handle<>
cur_module(python::borrowed(PyImport_Import(cur_name.get())));
I believe that the Python interpreter is initialized correctly prior to
the above calls because everything works fine until the contents of
OpenGL.GL are imported.
I have the stack trace (from FreeBSD 5) leading up to the above error
message being printed, but because I don't have a debugging build of the
Python runtime, it may not be very useful. Here it is nonetheless:
#0 0x286f9353 in kill () from /usr/lib/libc.so.5
#1 0x287627cc in abort () from /usr/lib/libc.so.5
#2 0x289e8267 in Py_FatalError ()
from /home/patrick/lib/python/OpenGL/GL/__init___.so
#3 0x289e4ea7 in Py_InitModule4 ()
from /home/patrick/lib/python/OpenGL/GL/__init___.so
#4 0x2899961f in init__init___ ()
from /home/patrick/lib/python/OpenGL/GL/__init___.so
#5 0x288393ee in _PyImport_LoadDynamicModule ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#6 0x2883762c in load_module ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#7 0x28838303 in import_submodule ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#8 0x28837ed4 in load_next ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#9 0x28837afd in import_module_ex ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#10 0x28837c4e in PyImport_ImportModuleEx ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#11 0x28855cb3 in builtin___import__ ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#12 0x28804e6c in PyCFunction_Call ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#13 0x287efb19 in PyObject_Call ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#14 0x28826f53 in PyEval_CallObjectWithKeywords ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#15 0x28824f82 in eval_frame ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#16 0x28826339 in PyEval_EvalCodeEx ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#17 0x28823417 in PyEval_EvalCode ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#18 0x28836760 in PyImport_ExecCodeModuleEx ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#19 0x28836d66 in load_source_module ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#20 0x28837602 in load_module ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#21 0x28836ef2 in load_package ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#22 0x2883763d in load_module ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#23 0x28838303 in import_submodule ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#24 0x28837ed4 in load_next ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#25 0x28837afd in import_module_ex ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#26 0x28837c4e in PyImport_ImportModuleEx ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#27 0x28855cb3 in builtin___import__ ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#28 0x28804e6c in PyCFunction_Call ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#29 0x287efb19 in PyObject_Call ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#30 0x28826f53 in PyEval_CallObjectWithKeywords ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#31 0x28824f82 in eval_frame ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#32 0x28826339 in PyEval_EvalCodeEx ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#33 0x28823417 in PyEval_EvalCode ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#34 0x28836760 in PyImport_ExecCodeModuleEx ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#35 0x28836d66 in load_source_module ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#36 0x28837602 in load_module ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#37 0x28836ef2 in load_package ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#38 0x2883763d in load_module ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#39 0x28838303 in import_submodule ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#40 0x28837ed4 in load_next ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#41 0x28837afd in import_module_ex ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#42 0x28837c4e in PyImport_ImportModuleEx ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#43 0x28855cb3 in builtin___import__ ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#44 0x28804e6c in PyCFunction_Call ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#45 0x287efb19 in PyObject_Call ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#46 0x28826f53 in PyEval_CallObjectWithKeywords ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#47 0x28824f82 in eval_frame ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#48 0x28826339 in PyEval_EvalCodeEx ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#49 0x28823417 in PyEval_EvalCode ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#50 0x28836760 in PyImport_ExecCodeModuleEx ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#51 0x28836d66 in load_source_module ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#52 0x28837602 in load_module ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#53 0x28838303 in import_submodule ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#54 0x28837ed4 in load_next ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#55 0x28837afd in import_module_ex ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#56 0x28837c4e in PyImport_ImportModuleEx ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#57 0x28855cb3 in builtin___import__ ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#58 0x28804e6c in PyCFunction_Call ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#59 0x287efb19 in PyObject_Call ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#60 0x28826f53 in PyEval_CallObjectWithKeywords ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#61 0x287efae0 in PyObject_CallObject ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#62 0x287efc2c in PyObject_CallFunction ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#63 0x28838722 in PyImport_Import ()
from /home/patrick/src/Juggler/Toolbox/simulators/PySim/PySim_drv.so
#64 0x287dace5 in simulators::PySim::switchDriver(std::string const&) (
this=0x817b200, module=@0x817b37c) at PySim.cpp:350
#65 0x287d9e66 in
simulators::PySim::config(boost::shared_ptr<jccl::ConfigChunk>)
(this=0x817b200, c={px = 0x8157740, pn = {pi_ = 0x8157760}}) at
PySim.cpp:139
#66 0x280c38f3 in
vrj::SimViewport::config(boost::shared_ptr<jccl::ConfigChunk>)
(this=0x8177a00, chunk={px = 0x81576e0, pn = {pi_ = 0x8157720}})
at
/home/patrick/src/Juggler/main/juggler/modules/vrjuggler/vrj/Display/SimViewport.cpp:94
#67 0x280a8006 in
vrj::Display::configViewports(boost::shared_ptr<jccl::ConfigChunk>)
(this=0x8172540, chunk={px = 0x811d740, pn = {pi_ = 0x811d760}})
at
/home/patrick/src/Juggler/main/juggler/modules/vrjuggler/vrj/Display/Display.cpp:130
#68 0x280a7298 in
vrj::Display::config(boost::shared_ptr<jccl::ConfigChunk>) (
this=0x8172540, chunk={px = 0x811d740, pn = {pi_ = 0x811d760}})
at
/home/patrick/src/Juggler/main/juggler/modules/vrjuggler/vrj/Display/Display.cpp:58
#69 0x280acfff in
vrj::DisplayManager::configAddDisplay(boost::shared_ptr<jccl::ConfigChunk>)
(this=0x81461c0, chunk={px = 0x811d740, pn = {pi_ = 0x811d760}})
at
/home/patrick/src/Juggler/main/juggler/modules/vrjuggler/vrj/Display/DisplayManager.cpp:210
#70 0x280abca9 in
vrj::DisplayManager::configAdd(boost::shared_ptr<jccl::ConfigChunk>)
(this=0x81461c0, chunk={px = 0x811d740, pn = {pi_ = 0x811d760}})
at
/home/patrick/src/Juggler/main/juggler/modules/vrjuggler/vrj/Display/DisplayManager.cpp:119
#71 0x2838f91f in jccl::ConfigChunkHandler::configProcessPending() (
this=0x81461c0)
at
/home/patrick/src/Juggler/main/juggler/modules/jackal/rtrc/jccl/RTRC/ConfigChunkHandler.cpp:95
#72 0x283961d5 in jccl::ConfigManager::attemptReconfiguration() (
this=0x8071440)
at
/home/patrick/src/Juggler/main/juggler/modules/jackal/rtrc/jccl/RTRC/ConfigManager.cpp:477
#73 0x280b6756 in vrj::Kernel::checkForReconfig() (this=0x8070180)
at
/home/patrick/src/Juggler/main/juggler/modules/vrjuggler/vrj/Kernel/Kernel.cpp:235
#74 0x280b61af in vrj::Kernel::controlLoop(void*) (this=0x8070180,
nullParam=0x0)
at
/home/patrick/src/Juggler/main/juggler/modules/vrjuggler/vrj/Kernel/Kernel.cpp:184
#75 0x280bdf4d in vpr::ThreadMemberFunctor<vrj::Kernel>::operator()() (
this=0x811de40) at Thread/ThreadFunctor.h:127
#76 0x2840bfd8 in vpr::ThreadPosix::startThread(void*) (this=0x8144940,
null_param=0x0)
at
/home/patrick/src/Juggler/main/juggler/modules/vapor/vpr/md/POSIX/Thread/ThreadPosix.cpp:299
#77 0x2840cafd in vpr::ThreadMemberFunctor<vpr::ThreadPosix>::operator()() (
this=0x811de60) at Thread/ThreadFunctor.h:127
#78 0x28407cd5 in vprThreadFunctorFunction (args=0x811de60)
#79 0x286944ee in _thread_start () from /usr/lib/libc_r.so.5
Any help or insight would be greatly appreciated.
-Patrick
--
Patrick L. Hartling | Research Assistant, VRAC
pa...@vr... | 2624 Howe Hall: 1.515.294.4916
http://www.137.org/patrick/ | http://www.vrac.iastate.edu/
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