kopia lustrzana https://github.com/espressif/esp-idf
58 wiersze
1.5 KiB
Python
58 wiersze
1.5 KiB
Python
# SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
|
|
# SPDX-License-Identifier: Apache-2.0
|
|
|
|
import threading
|
|
from typing import Optional
|
|
|
|
|
|
class StoppableThread(object):
|
|
"""
|
|
Provide a Thread-like class which can be 'cancelled' via a subclass-provided
|
|
cancellation method.
|
|
|
|
Can be started and stopped multiple times.
|
|
|
|
Isn't an instance of type Thread because Python Thread objects can only be run once
|
|
"""
|
|
|
|
def __init__(self):
|
|
# type: () -> None
|
|
self._thread = None # type: Optional[threading.Thread]
|
|
|
|
@property
|
|
def alive(self):
|
|
# type: () -> bool
|
|
"""
|
|
Is 'alive' whenever the internal thread object exists
|
|
"""
|
|
return self._thread is not None
|
|
|
|
def start(self):
|
|
# type: () -> None
|
|
if self._thread is None:
|
|
self._thread = threading.Thread(target=self._run_outer)
|
|
self._thread.start()
|
|
|
|
def _cancel(self):
|
|
# type: () -> None
|
|
pass # override to provide cancellation functionality
|
|
|
|
def run(self):
|
|
# type: () -> None
|
|
pass # override for the main thread behaviour
|
|
|
|
def _run_outer(self):
|
|
# type: () -> None
|
|
try:
|
|
self.run()
|
|
finally:
|
|
self._thread = None
|
|
|
|
def stop(self):
|
|
# type: () -> None
|
|
if self._thread is not None:
|
|
old_thread = self._thread
|
|
self._thread = None
|
|
self._cancel()
|
|
old_thread.join()
|