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import asyncio
import threading
import unittest
from threading import Thread
from unittest import TestCase
import weakref
from test import support
from test.support import threading_helper
threading_helper.requires_working_threading(module=True)
class MyException(Exception):
pass
def tearDownModule():
asyncio._set_event_loop_policy(None)
class TestFreeThreading:
def test_all_tasks_race(self) -> None:
async def main():
loop = asyncio.get_running_loop()
future = loop.create_future()
async def coro():
await future
tasks = set()
async with asyncio.TaskGroup() as tg:
for _ in range(100):
tasks.add(tg.create_task(coro()))
all_tasks = asyncio.all_tasks(loop)
self.assertEqual(len(all_tasks), 101)
for task in all_tasks:
self.assertEqual(task.get_loop(), loop)
self.assertFalse(task.done())
current = asyncio.current_task()
self.assertEqual(current.get_loop(), loop)
self.assertSetEqual(all_tasks, tasks | {current})
future.set_result(None)
def runner():
with asyncio.Runner() as runner:
loop = runner.get_loop()
loop.set_task_factory(self.factory)
runner.run(main())
threads = []
for _ in range(10):
thread = Thread(target=runner)
threads.append(thread)
with threading_helper.start_threads(threads):
pass
def test_all_tasks_different_thread(self) -> None:
loop = None
started = threading.Event()
done = threading.Event() # used for main task not finishing early
async def coro():
await asyncio.Future()
lock = threading.Lock()
tasks = set()
async def main():
nonlocal tasks, loop
loop = asyncio.get_running_loop()
started.set()
for i in range(1000):
with lock:
asyncio.create_task(coro())
tasks = asyncio.all_tasks(loop)
done.wait()
runner = threading.Thread(target=lambda: asyncio.run(main()))
def check():
started.wait()
with lock:
self.assertSetEqual(tasks & asyncio.all_tasks(loop), tasks)
threads = [threading.Thread(target=check) for _ in range(10)]
runner.start()
with threading_helper.start_threads(threads):
pass
done.set()
runner.join()
def test_task_different_thread_finalized(self) -> None:
task = None
async def func():
nonlocal task
task = asyncio.current_task()
def runner():
with asyncio.Runner() as runner:
loop = runner.get_loop()
loop.set_task_factory(self.factory)
runner.run(func())
thread = Thread(target=runner)
thread.start()
thread.join()
wr = weakref.ref(task)
del thread
del task
# task finalization in different thread shouldn't crash
support.gc_collect()
self.assertIsNone(wr())
def test_run_coroutine_threadsafe(self) -> None:
results = []
def in_thread(loop: asyncio.AbstractEventLoop):
coro = asyncio.sleep(0.1, result=42)
fut = asyncio.run_coroutine_threadsafe(coro, loop)
result = fut.result()
self.assertEqual(result, 42)
results.append(result)
async def main():
loop = asyncio.get_running_loop()
async with asyncio.TaskGroup() as tg:
for _ in range(10):
tg.create_task(asyncio.to_thread(in_thread, loop))
self.assertEqual(results, [42] * 10)
with asyncio.Runner() as r:
loop = r.get_loop()
loop.set_task_factory(self.factory)
r.run(main())
def test_run_coroutine_threadsafe_exception(self) -> None:
async def coro():
await asyncio.sleep(0)
raise MyException("test")
def in_thread(loop: asyncio.AbstractEventLoop):
fut = asyncio.run_coroutine_threadsafe(coro(), loop)
return fut.result()
async def main():
loop = asyncio.get_running_loop()
tasks = []
for _ in range(10):
task = loop.create_task(asyncio.to_thread(in_thread, loop))
tasks.append(task)
results = await asyncio.gather(*tasks, return_exceptions=True)
self.assertEqual(len(results), 10)
for result in results:
self.assertIsInstance(result, MyException)
self.assertEqual(str(result), "test")
with asyncio.Runner() as r:
loop = r.get_loop()
loop.set_task_factory(self.factory)
r.run(main())
class TestPyFreeThreading(TestFreeThreading, TestCase):
def setUp(self):
self._old_current_task = asyncio.current_task
asyncio.current_task = asyncio.tasks.current_task = asyncio.tasks._py_current_task
self._old_all_tasks = asyncio.all_tasks
asyncio.all_tasks = asyncio.tasks.all_tasks = asyncio.tasks._py_all_tasks
self._old_Task = asyncio.Task
asyncio.Task = asyncio.tasks.Task = asyncio.tasks._PyTask
self._old_Future = asyncio.Future
asyncio.Future = asyncio.futures.Future = asyncio.futures._PyFuture
return super().setUp()
def tearDown(self):
asyncio.current_task = asyncio.tasks.current_task = self._old_current_task
asyncio.all_tasks = asyncio.tasks.all_tasks = self._old_all_tasks
asyncio.Task = asyncio.tasks.Task = self._old_Task
asyncio.Future = asyncio.tasks.Future = self._old_Future
return super().tearDown()
def factory(self, loop, coro, **kwargs):
return asyncio.tasks._PyTask(coro, loop=loop, **kwargs)
@unittest.skipUnless(hasattr(asyncio.tasks, "_c_all_tasks"), "requires _asyncio")
class TestCFreeThreading(TestFreeThreading, TestCase):
def setUp(self):
self._old_current_task = asyncio.current_task
asyncio.current_task = asyncio.tasks.current_task = asyncio.tasks._c_current_task
self._old_all_tasks = asyncio.all_tasks
asyncio.all_tasks = asyncio.tasks.all_tasks = asyncio.tasks._c_all_tasks
self._old_Task = asyncio.Task
asyncio.Task = asyncio.tasks.Task = asyncio.tasks._CTask
self._old_Future = asyncio.Future
asyncio.Future = asyncio.futures.Future = asyncio.futures._CFuture
return super().setUp()
def tearDown(self):
asyncio.current_task = asyncio.tasks.current_task = self._old_current_task
asyncio.all_tasks = asyncio.tasks.all_tasks = self._old_all_tasks
asyncio.Task = asyncio.tasks.Task = self._old_Task
asyncio.Future = asyncio.futures.Future = self._old_Future
return super().tearDown()
def factory(self, loop, coro, **kwargs):
return asyncio.tasks._CTask(coro, loop=loop, **kwargs)
class TestEagerPyFreeThreading(TestPyFreeThreading):
def factory(self, loop, coro, eager_start=True, **kwargs):
return asyncio.tasks._PyTask(coro, loop=loop, **kwargs, eager_start=eager_start)
@unittest.skipUnless(hasattr(asyncio.tasks, "_c_all_tasks"), "requires _asyncio")
class TestEagerCFreeThreading(TestCFreeThreading, TestCase):
def factory(self, loop, coro, eager_start=True, **kwargs):
return asyncio.tasks._CTask(coro, loop=loop, **kwargs, eager_start=eager_start)
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