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import threading
from unittest import TestCase
from test.support import threading_helper
from random import randint
from io import BytesIO
from sys import getsizeof
class TestBytesIO(TestCase):
# Test pretty much everything that can break under free-threading.
# Non-deterministic, but at least one of these things will fail if
# BytesIO object is not free-thread safe.
def check(self, funcs, *args):
barrier = threading.Barrier(len(funcs))
threads = []
for func in funcs:
thread = threading.Thread(target=func, args=(barrier, *args))
threads.append(thread)
with threading_helper.start_threads(threads):
pass
@threading_helper.requires_working_threading()
@threading_helper.reap_threads
def test_free_threading(self):
"""Test for segfaults and aborts."""
def write(barrier, b, *ignore):
barrier.wait()
try: b.write(b'0' * randint(100, 1000))
except ValueError: pass # ignore write fail to closed file
def writelines(barrier, b, *ignore):
barrier.wait()
b.write(b'0\n' * randint(100, 1000))
def truncate(barrier, b, *ignore):
barrier.wait()
try: b.truncate(0)
except BufferError: pass # ignore exported buffer
def read(barrier, b, *ignore):
barrier.wait()
b.read()
def read1(barrier, b, *ignore):
barrier.wait()
b.read1()
def readline(barrier, b, *ignore):
barrier.wait()
b.readline()
def readlines(barrier, b, *ignore):
barrier.wait()
b.readlines()
def readinto(barrier, b, into, *ignore):
barrier.wait()
b.readinto(into)
def close(barrier, b, *ignore):
barrier.wait()
b.close()
def getvalue(barrier, b, *ignore):
barrier.wait()
b.getvalue()
def getbuffer(barrier, b, *ignore):
barrier.wait()
b.getbuffer()
def iter(barrier, b, *ignore):
barrier.wait()
list(b)
def getstate(barrier, b, *ignore):
barrier.wait()
b.__getstate__()
def setstate(barrier, b, st, *ignore):
barrier.wait()
b.__setstate__(st)
def sizeof(barrier, b, *ignore):
barrier.wait()
getsizeof(b)
self.check([write] * 10, BytesIO())
self.check([writelines] * 10, BytesIO())
self.check([write] * 10 + [truncate] * 10, BytesIO())
self.check([truncate] + [read] * 10, BytesIO(b'0\n'*204800))
self.check([truncate] + [read1] * 10, BytesIO(b'0\n'*204800))
self.check([truncate] + [readline] * 10, BytesIO(b'0\n'*20480))
self.check([truncate] + [readlines] * 10, BytesIO(b'0\n'*20480))
self.check([truncate] + [readinto] * 10, BytesIO(b'0\n'*204800), bytearray(b'0\n'*204800))
self.check([close] + [write] * 10, BytesIO())
self.check([truncate] + [getvalue] * 10, BytesIO(b'0\n'*204800))
self.check([truncate] + [getbuffer] * 10, BytesIO(b'0\n'*204800))
self.check([truncate] + [iter] * 10, BytesIO(b'0\n'*20480))
self.check([truncate] + [getstate] * 10, BytesIO(b'0\n'*204800))
self.check([truncate] + [setstate] * 10, BytesIO(b'0\n'*204800), (b'123', 0, None))
self.check([truncate] + [sizeof] * 10, BytesIO(b'0\n'*204800))
# no tests for seek or tell because they don't break anything
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