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"""
Kill a thread, from http://sebulba.wikispaces.com/recipe+thread2
"""
import six
try:
import ctypes
except ImportError:
raise ImportError(
"You cannot use paste.util.killthread without ctypes installed")
if not hasattr(ctypes, 'pythonapi'):
raise ImportError(
"You cannot use paste.util.killthread without ctypes.pythonapi")
def async_raise(tid, exctype):
"""raises the exception, performs cleanup if needed.
tid is the value given by thread.get_ident() (an integer).
Raise SystemExit to kill a thread."""
if not isinstance(exctype, (six.class_types, type)):
raise TypeError("Only types can be raised (not instances)")
if not isinstance(tid, int):
raise TypeError("tid must be an integer")
res = ctypes.pythonapi.PyThreadState_SetAsyncExc(ctypes.c_long(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(ctypes.c_long(tid), 0)
raise SystemError("PyThreadState_SetAsyncExc failed")
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