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bpo-31234: Context manager to wait until all threads created in the with
statement exit.
Use _thread.count() to check if threads exited. Indirectly, wait until
threads exit the internal t_bootstrap() C function of the _thread module.
threading_setup() and threading_cleanup() are designed to emit a warning
if a test leaves running threads in the background. This context manager
is designed to cleanup threads started by the _thread.start_new_thread()
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S ) �catch_threading_exceptiona
Context manager catching threading.Thread exception using
threading.excepthook.
Attributes set when an exception is caught:
* exc_type
* exc_value
* exc_traceback
* thread
See threading.excepthook() documentation for these attributes.
These attributes are deleted at the context manager exit.
Usage:
with threading_helper.catch_threading_exception() as cm:
# code spawning a thread which raises an exception
...
# check the thread exception, use cm attributes:
# exc_type, exc_value, exc_traceback, thread
...
# exc_type, exc_value, exc_traceback, thread attributes of cm no longer
# exists at this point
# (to avoid reference cycles)
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