我的多线程应用程序在调用PyImport_ImportModule("my_module")时出现分段错误。
英国电信将张贴在底部。
一些背景:
我的应用程序创建了许多派生grasp_behavior(module)
Run()函数,该函数使用虚拟方法来确定要做什么。在泛读中,Grasp_Behavior(类),我使用Python来实现(2) (在下面使用)H 113/code>中运行它们,PyImport_ImportModule节段故障
我的想法是,也许我不能在同一个解释器中两次导入一个模块。但我想不出怎么检查。我想我需要看看grasp_behavior是否在字典中,但我不知道是哪一本,也许我得到了__main__模块的字典?
但是我可能错了,任何建议都是非常有帮助的!
在构造函数中:
//Check if Python is Initialized, otherwise initialize it
if(!Py_IsInitialized())
{
std::cout << "[GraspBehavior] InitPython: Initializing the Python Interpreter" << std::endl;
Py_Initialize();
PyEval_InitThreads(); //Initialize Python thread ability
PyEval_ReleaseLock(); //Release the implicit lock on the Python GIL
}
// --- Handle Imports ----
PyObject * pModule = PyImport_ImportModule("grasp_behavior");
if(pModule == NULL)
{
std::cout << "[GraspBehavior] InitPython: Unable to import grasp_behavior module: ";
PyErr_Print();
}
// --- Get our Class Pointer From the Module ...
PyObject * pClass = PyObject_GetAttrString(pModule, "Grasp_Behavior");
if(pClass == NULL)
{
std::cout << "[GraspBehavior] InitPython: Unable to get Class from Module: ";
PyErr_Print();
}
Py_DECREF(pModule); //clean up, this is a new reference
behavior_instance_ = PyObject_Call(pClass, pArguments_Tuple, pArguments_Dict);
if(behavior_instance_ == NULL)
{
std::cout << "[GraspBehavior] InitPython: Couldn't generate instance: ";
PyErr_Print();
}
Py_DECREF(pArguments_Tuple);
Py_DECREF(pArguments_Dict);
Py_DECREF(pClass);在这里,请注意,我只初始化未初始化的Python解释器。我假设它是为整个过程初始化的。
在Run()方法中(从boost线程运行):
std::cout << "[GraspBehavior] PerformBehavior: Acquiring Python GIL Lock ..." << std::endl;
PyGILState_STATE py_gilstate;
py_gilstate = PyGILState_Ensure();
/* ---- Perform Behavior Below ----- */
std::vector<std::pair<double, double> > desired_body_offsets;
//desired_body_offsets.push_back( std::pair<double, double>(0.6, 0));
PyObject * base_positions = GetTrialBasePositions(my_env_, desired_body_offsets);
PyObject * grasps = EvaluateBasePositions(my_env_, base_positions);
//Did we get any grasps? What do we do with them? [TODO]
if(grasps != NULL)
{
std::cout << grasps->ob_type->tp_name << std::endl;
std::cout << "Number of grasps: " << PyList_Size(grasps) << std::endl;
successful_ = true;
}
/* --------------------------------- */
std::cout << "[GraspBehavior] PerformBehavior: Releasing Python GIL Lock ..." << std::endl;
PyGILState_Release(py_gilstate);在这里,我和PyGILState锁一起去了。我读了一段时间,似乎许多人都是链接的一些文章使用了Python中较旧的锁定风格.也许我得换一下这个。
回溯:
Program received signal SIGSEGV, Segmentation fault.
0x00007fffee9c4330 in ?? () from /usr/lib/libpython2.6.so.1.0
(gdb) bt
#0 0x00007fffee9c4330 in ?? () from /usr/lib/libpython2.6.so.1.0
#1 0x00007fffee99ff09 in PyEval_GetGlobals ()
from /usr/lib/libpython2.6.so.1.0
#2 0x00007fffee9bd993 in PyImport_Import () from /usr/lib/libpython2.6.so.1.0
#3 0x00007fffee9bdbec in PyImport_ImportModule ()
from /usr/lib/libpython2.6.so.1.0
#4 0x000000000042d6f0 in GraspBehavior::InitPython (this=0x7948690)
at grasp_behavior.cpp:241发布于 2012-01-17 00:31:17
Boost是否提供了一个与pthread_once()函数等价的道德功能,允许某些初始化任务精确地运行一次,而不管有多少线程试图同时运行它?如果这是我在调试时遇到的问题,我将尝试保护PyImport_ImportModule不受多个线程中的多个调用的影响,并为此使用一个标准工具,这将是我的第一次尝试。
https://stackoverflow.com/questions/8888124
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