1.Python/dynload_shlib.c:94: undefined reference to `dlsym’
to solve the problems such as under Ubuntu:
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Python/dynload_shlib.c:94: undefined reference to `dlsym’
dynload_shlib.c:130: undefined reference to `dlopen’
Python/dynload_shlib.c:141: undefined reference to `dlsym’
Python/dynload_shlib.c:133: undefined reference to `dlerror’
—————————————————————————————-
To solve this linking problem, run ‘python-config –libs’, then you got the dynamic library list. Find where these libs are, and add their paths to LD_LIBRARY_PATH before ‘scons ./build/ARM/gem5.opt’
Finally, it works!
2.PyImport_Import() fail:
如果python在编译安装的时候，没有使用:
./configure –enable-shared
那么就会造成在/usr/local/lib/目录下只有libpython2.7.a而没有libpython2.7.so，这个时候需要给makefile加一个参数:
C_FLAGS += -export-dynamic
或者重新使用./configure –enable-shared编译Python.
3.C/C++多线程调用Python
Python中有一个GIL，导致Python线程效率很低，此外若在C/C++中创建线程来调用Python解释器，会造成段错误。
解决方式：
//主线程中
Py_Initialize();
PyEval_InitThreads();
PyEval_ReleaseLock(); //启动子线程前执行，为了释放PyEval_InitThreads获得的全局锁，否则子线程可能无法获取到全局锁。
//子线程中
PyGILState_STATE state = PyGILState_Ensure();
….. //调用Python代码
PyGILState_Release(state);
//主线程中
//保证子线程调用都结束后
PyGILState_Ensure();
Py_Finalize();
//之后不能再调用任何Python的API
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