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65 lines
2.0 KiB
Python
65 lines
2.0 KiB
Python
"""Python threading tools."""
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from __future__ import annotations
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import functools
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import sys
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import threading
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import queue
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import typing as t
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TCallable = t.TypeVar('TCallable', bound=t.Callable)
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class WrappedThread(threading.Thread):
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"""Wrapper around Thread which captures results and exceptions."""
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def __init__(self, action): # type: (t.Callable[[], t.Any]) -> None
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super().__init__()
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self._result = queue.Queue()
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self.action = action
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self.result = None
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def run(self):
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"""
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Run action and capture results or exception.
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Do not override. Do not call directly. Executed by the start() method.
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"""
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# We truly want to catch anything that the worker thread might do including call sys.exit.
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# Therefore we catch *everything* (including old-style class exceptions)
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# noinspection PyBroadException, PyPep8
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try:
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self._result.put((self.action(), None))
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# pylint: disable=locally-disabled, bare-except
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except: # noqa
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self._result.put((None, sys.exc_info()))
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def wait_for_result(self):
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"""
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Wait for thread to exit and return the result or raise an exception.
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:rtype: any
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"""
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result, exception = self._result.get()
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if exception:
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if sys.version_info[0] > 2:
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raise exception[1].with_traceback(exception[2])
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# noinspection PyRedundantParentheses
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exec('raise exception[0], exception[1], exception[2]') # pylint: disable=locally-disabled, exec-used
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self.result = result
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return result
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def mutex(func): # type: (TCallable) -> TCallable
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"""Enforce exclusive access on a decorated function."""
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lock = threading.Lock()
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@functools.wraps(func)
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def wrapper(*args, **kwargs):
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"""Wrapper around `func` which uses a lock to provide exclusive access to the function."""
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with lock:
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return func(*args, **kwargs)
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return wrapper
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