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"""
Thread subclass that can deal with asynchronously function calls via
raise_exc.
"""
import threading
import inspect
import ctypes
def _async_raise(tid, exctype):
"""raises the exception, performs cleanup if needed"""
if not inspect.isclass(exctype):
raise TypeError("Only types can be raised (not instances)")
res = ctypes.pythonapi.PyThreadState_SetAsyncExc(tid, ctypes.py_object(exctype))
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 ThreadEx(threading.Thread):
def _get_my_tid(self):
"""determines this (self's) thread id"""
if not self.isAlive():
raise threading.ThreadError("the thread is not active")
# do we have it cached?
if hasattr(self, "_thread_id"):
return self._thread_id
# no, look for it in the _active dict
for tid, tobj in threading._active.items():
if tobj is self:
self._thread_id = tid
return tid
raise AssertionError("could not determine the thread's id")
def raise_exc(self, exctype):
"""raises the given exception type in the context of this thread"""
_async_raise(self._get_my_tid(), exctype)
def kill(self):
"""raises SystemExit in the context of the given thread, which should
cause the thread to exit silently (unless caught)"""
self.raise_exc(SystemExit)
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