lib-python.2.7.test.test_threading_local.py Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jython Show documentation
Show all versions of jython Show documentation
Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
import unittest
from doctest import DocTestSuite
from test import test_support
import weakref
import gc
# Modules under test
_thread = test_support.import_module('thread')
threading = test_support.import_module('threading')
import _threading_local
class Weak(object):
pass
def target(local, weaklist):
weak = Weak()
local.weak = weak
weaklist.append(weakref.ref(weak))
class BaseLocalTest:
def test_local_refs(self):
self._local_refs(20)
self._local_refs(50)
self._local_refs(100)
def _local_refs(self, n):
local = self._local()
weaklist = []
for i in range(n):
t = threading.Thread(target=target, args=(local, weaklist))
t.start()
t.join()
del t
gc.collect()
self.assertEqual(len(weaklist), n)
# XXX _threading_local keeps the local of the last stopped thread alive.
deadlist = [weak for weak in weaklist if weak() is None]
self.assertIn(len(deadlist), (n-1, n))
# Assignment to the same thread local frees it sometimes (!)
local.someothervar = None
gc.collect()
deadlist = [weak for weak in weaklist if weak() is None]
self.assertIn(len(deadlist), (n-1, n), (n, len(deadlist)))
def test_derived(self):
# Issue 3088: if there is a threads switch inside the __init__
# of a threading.local derived class, the per-thread dictionary
# is created but not correctly set on the object.
# The first member set may be bogus.
import time
class Local(self._local):
def __init__(self):
time.sleep(0.01)
local = Local()
def f(i):
local.x = i
# Simply check that the variable is correctly set
self.assertEqual(local.x, i)
threads= []
for i in range(10):
t = threading.Thread(target=f, args=(i,))
t.start()
threads.append(t)
for t in threads:
t.join()
def test_derived_cycle_dealloc(self):
# http://bugs.python.org/issue6990
class Local(self._local):
pass
locals = None
passed = [False]
e1 = threading.Event()
e2 = threading.Event()
def f():
# 1) Involve Local in a cycle
cycle = [Local()]
cycle.append(cycle)
cycle[0].foo = 'bar'
# 2) GC the cycle (triggers threadmodule.c::local_clear
# before local_dealloc)
del cycle
gc.collect()
e1.set()
e2.wait()
# 4) New Locals should be empty
passed[0] = all(not hasattr(local, 'foo') for local in locals)
t = threading.Thread(target=f)
t.start()
e1.wait()
# 3) New Locals should recycle the original's address. Creating
# them in the thread overwrites the thread state and avoids the
# bug
locals = [Local() for i in range(10)]
e2.set()
t.join()
self.assertTrue(passed[0])
def test_arguments(self):
# Issue 1522237
from thread import _local as local
from _threading_local import local as py_local
for cls in (local, py_local):
class MyLocal(cls):
def __init__(self, *args, **kwargs):
pass
MyLocal(a=1)
MyLocal(1)
self.assertRaises(TypeError, cls, a=1)
self.assertRaises(TypeError, cls, 1)
def _test_one_class(self, c):
self._failed = "No error message set or cleared."
obj = c()
e1 = threading.Event()
e2 = threading.Event()
def f1():
obj.x = 'foo'
obj.y = 'bar'
del obj.y
e1.set()
e2.wait()
def f2():
try:
foo = obj.x
except AttributeError:
# This is expected -- we haven't set obj.x in this thread yet!
self._failed = "" # passed
else:
self._failed = ('Incorrectly got value %r from class %r\n' %
(foo, c))
sys.stderr.write(self._failed)
t1 = threading.Thread(target=f1)
t1.start()
e1.wait()
t2 = threading.Thread(target=f2)
t2.start()
t2.join()
# The test is done; just let t1 know it can exit, and wait for it.
e2.set()
t1.join()
self.assertFalse(self._failed, self._failed)
def test_threading_local(self):
self._test_one_class(self._local)
def test_threading_local_subclass(self):
class LocalSubclass(self._local):
"""To test that subclasses behave properly."""
self._test_one_class(LocalSubclass)
def _test_dict_attribute(self, cls):
obj = cls()
obj.x = 5
self.assertEqual(obj.__dict__, {'x': 5})
with self.assertRaises(AttributeError):
obj.__dict__ = {}
with self.assertRaises(AttributeError):
del obj.__dict__
def test_dict_attribute(self):
self._test_dict_attribute(self._local)
def test_dict_attribute_subclass(self):
class LocalSubclass(self._local):
"""To test that subclasses behave properly."""
self._test_dict_attribute(LocalSubclass)
class ThreadLocalTest(unittest.TestCase, BaseLocalTest):
_local = _thread._local
# Fails for the pure Python implementation
def test_cycle_collection(self):
class X:
pass
x = X()
x.local = self._local()
x.local.x = x
wr = weakref.ref(x)
del x
gc.collect()
self.assertIs(wr(), None)
class PyThreadingLocalTest(unittest.TestCase, BaseLocalTest):
_local = _threading_local.local
def test_main():
suite = unittest.TestSuite()
suite.addTest(DocTestSuite('_threading_local'))
suite.addTest(unittest.makeSuite(ThreadLocalTest))
suite.addTest(unittest.makeSuite(PyThreadingLocalTest))
try:
from thread import _local
except ImportError:
pass
else:
import _threading_local
local_orig = _threading_local.local
def setUp(test):
_threading_local.local = _local
def tearDown(test):
_threading_local.local = local_orig
suite.addTest(DocTestSuite('_threading_local',
setUp=setUp, tearDown=tearDown)
)
test_support.run_unittest(suite)
if __name__ == '__main__':
test_main()