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import threading
from ..exceptions import InkstitchException
from ..debug import debug
class ExitThread(InkstitchException):
"""This exception is thrown in a thread to cause it to terminate.
Presumably we should only catch this at the thread's top level.
"""
pass
# A default flag used for the main thread. It will never be set.
_default_stop_flag = threading.Event()
def check_stop_flag():
# This getattr() actually looks at the PreviewRenderer instance's stop attribute.
if getattr(threading.current_thread(), 'stop', _default_stop_flag).is_set():
debug.log("exiting thread")
raise ExitThread()
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