3d4ac1a2c2
Concurrent accesses from multiple threads to the same `cell` object did not scale well in the free-threaded build. Use `_PyStackRef` and optimistically avoid locking to improve scaling. With the locks around cell reads gone, some of the free threading tests were prone to starvation: the readers were able to run in a tight loop and the writer threads weren't scheduled frequently enough to make timely progress. Adjust the tests to avoid this. Co-authored-by: Donghee Na <donghee.na@python.org>
97 lines
2.4 KiB
Python
97 lines
2.4 KiB
Python
import unittest
|
|
|
|
from threading import Thread, Barrier
|
|
from unittest import TestCase
|
|
|
|
from test.support import threading_helper
|
|
|
|
|
|
NTHREAD = 10
|
|
OBJECT_COUNT = 5_000
|
|
|
|
|
|
class C:
|
|
def __init__(self, v):
|
|
self.v = v
|
|
|
|
|
|
@threading_helper.requires_working_threading()
|
|
class TestList(TestCase):
|
|
def test_racing_iter_append(self):
|
|
l = []
|
|
|
|
barrier = Barrier(NTHREAD + 1)
|
|
def writer_func(l):
|
|
barrier.wait()
|
|
for i in range(OBJECT_COUNT):
|
|
l.append(C(i + OBJECT_COUNT))
|
|
|
|
def reader_func(l):
|
|
barrier.wait()
|
|
while True:
|
|
count = len(l)
|
|
for i, x in enumerate(l):
|
|
self.assertEqual(x.v, i + OBJECT_COUNT)
|
|
if count == OBJECT_COUNT:
|
|
break
|
|
|
|
writer = Thread(target=writer_func, args=(l,))
|
|
readers = []
|
|
for x in range(NTHREAD):
|
|
reader = Thread(target=reader_func, args=(l,))
|
|
readers.append(reader)
|
|
reader.start()
|
|
|
|
writer.start()
|
|
writer.join()
|
|
for reader in readers:
|
|
reader.join()
|
|
|
|
def test_racing_iter_extend(self):
|
|
l = []
|
|
|
|
barrier = Barrier(NTHREAD + 1)
|
|
def writer_func():
|
|
barrier.wait()
|
|
for i in range(OBJECT_COUNT):
|
|
l.extend([C(i + OBJECT_COUNT)])
|
|
|
|
def reader_func():
|
|
barrier.wait()
|
|
while True:
|
|
count = len(l)
|
|
for i, x in enumerate(l):
|
|
self.assertEqual(x.v, i + OBJECT_COUNT)
|
|
if count == OBJECT_COUNT:
|
|
break
|
|
|
|
writer = Thread(target=writer_func)
|
|
readers = []
|
|
for x in range(NTHREAD):
|
|
reader = Thread(target=reader_func)
|
|
readers.append(reader)
|
|
reader.start()
|
|
|
|
writer.start()
|
|
writer.join()
|
|
for reader in readers:
|
|
reader.join()
|
|
|
|
def test_store_list_int(self):
|
|
def copy_back_and_forth(b, l):
|
|
b.wait()
|
|
for _ in range(100):
|
|
l[0] = l[1]
|
|
l[1] = l[0]
|
|
|
|
l = [0, 1]
|
|
barrier = Barrier(NTHREAD)
|
|
threads = [Thread(target=copy_back_and_forth, args=(barrier, l))
|
|
for _ in range(NTHREAD)]
|
|
with threading_helper.start_threads(threads):
|
|
pass
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|