#
# -*- coding: utf-8 -*-
#
# Copyright (c) 2014 by Anselm Kruis
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#

from __future__ import absolute_import, print_function, unicode_literals, division

import threading
import sys


def save_frame():
    global a_frame
    a_frame = sys._getframe()

# Create a frame on a dead thread
t = threading.Thread(target=save_frame)
t.start()
t.join()

# no cause an access violation in PyFrame_IsRestricted(f)
# PyFrame_IsRestricted is a macro:
# #define PyFrame_IsRestricted(f) \
#    ((f)->f_builtins != (f)->f_tstate->interp->builtins)
#
# *((f)->f_tstate) is no longer valid. It depends on the content of the memory,
# if (f)->f_tstate->interp causes an access violation. I use a debug build on windows,
# to get reliable access violation.
f_restricted = a_frame.f_restricted

print("No crash, restricted=", f_restricted)