import threading
import inspect
import ctypes
def _async_raise(tid, exc_type):
"""raises the exception, performs cleanup if needed"""
if not inspect.isclass(exc_type):
raise TypeError("Only types can be raised (not instances)")
res = ctypes.pythonapi.PyThreadState_SetAsyncExc(tid, ctypes.py_object(exc_type))
if res == 0:
raise ValueError("invalid thread id")
elif res != 1:
# """if it returns a number greater than one, you're in trouble,
# and you should call it again with exc=NULL to revert the effect"""
ctypes.pythonapi.PyThreadState_SetAsyncExc(tid, 0)
raise SystemError("PyThreadState_SetAsyncExc failed")
class Thread(threading.Thread):
def raise_exc(self, exc_type):
"""raises the given exception type in the context of this thread"""
_async_raise(ctypes.c_long(self.ident), exc_type)
def terminate(self):
"""raises SystemExit in the context of the given thread, which should
cause the thread to exit silently (unless caught)"""
self.raise_exc(SystemExit)
