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General Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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Im writing Python extension module with threads and hookers. I need to throw exception from one of my threads to main Python thread. For this Im using int PyThreadState_SetAsyncExc(unsigned long id, PyObject *exc). In the documentation sayd:
int PyThreadState_SetAsyncExc(unsigned long id, PyObject *exc)
exc is the exception object to be raised
exc
Nothing easier. But when I call PyThreadState_SetAsyncExc with Exception (actually PyExc_Exception) instance as exc, I get
PyThreadState_SetAsyncExc
Exception
PyExc_Exception
SystemError: exception Exception('Error text') not a BaseException subclass
I can read:), so I tried put not a class instance (as stated in docs, I believe), but class object directly as exc and it worsk. But, as a result, I cannot pass arguments to it.
This code causes system error in main thread:
PyGILState_STATE gstate = PyGILState_Ensure(); PyThreadState_SetAsyncExc(self->main_thread_id, PyObject_CallObject(PyExc_Exception, Py_BuildValue("(s)", "Error text"))); PyGILState_Release(gstate);
This code causes expected Exception in main thread:
PyGILState_STATE gstate = PyGILState_Ensure(); PyThreadState_SetAsyncExc(self->main_thread_id, PyExc_Exception); PyGILState_Release(gstate);
Full error text, IDLE shows:
Traceback (most recent call last): ** IDLE Internal Exception: File "C:\Python37-32\lib\idlelib\run.py", line 137, in main request = rpc.request_queue.get(block=True, timeout=0.05) File "C:\Python37-32\lib\queue.py", line 179, in get self.not_empty.wait(remaining) File "C:\Python37-32\lib\threading.py", line 300, in wait gotit = waiter.acquire(True, timeout) SystemError: exception Exception('Error text') not a BaseException subclass
So, I expected PyThreadState_SetAsyncExc supports exception instance-objects, but it looks like it supports only class/type-objects. Am I correct? Or maybe I do it wrong?
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