cpython/Lib/test/test_dummy_thread.py

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import _dummy_thread as _thread
import time
import queue
import random
import unittest
from test import support
from unittest import mock
DELAY = 0
class LockTests(unittest.TestCase):
"""Test lock objects."""
def setUp(self):
# Create a lock
self.lock = _thread.allocate_lock()
def test_initlock(self):
#Make sure locks start locked
self.assertFalse(self.lock.locked(),
"Lock object is not initialized unlocked.")
def test_release(self):
# Test self.lock.release()
self.lock.acquire()
self.lock.release()
self.assertFalse(self.lock.locked(),
"Lock object did not release properly.")
def test_LockType_context_manager(self):
with _thread.LockType():
pass
self.assertFalse(self.lock.locked(),
"Acquired Lock was not released")
def test_improper_release(self):
#Make sure release of an unlocked thread raises RuntimeError
self.assertRaises(RuntimeError, self.lock.release)
def test_cond_acquire_success(self):
#Make sure the conditional acquiring of the lock works.
self.assertTrue(self.lock.acquire(0),
"Conditional acquiring of the lock failed.")
def test_cond_acquire_fail(self):
#Test acquiring locked lock returns False
self.lock.acquire(0)
self.assertFalse(self.lock.acquire(0),
"Conditional acquiring of a locked lock incorrectly "
"succeeded.")
def test_uncond_acquire_success(self):
#Make sure unconditional acquiring of a lock works.
self.lock.acquire()
self.assertTrue(self.lock.locked(),
"Uncondional locking failed.")
def test_uncond_acquire_return_val(self):
#Make sure that an unconditional locking returns True.
self.assertIs(self.lock.acquire(1), True,
"Unconditional locking did not return True.")
self.assertIs(self.lock.acquire(), True)
def test_uncond_acquire_blocking(self):
#Make sure that unconditional acquiring of a locked lock blocks.
def delay_unlock(to_unlock, delay):
"""Hold on to lock for a set amount of time before unlocking."""
time.sleep(delay)
to_unlock.release()
self.lock.acquire()
start_time = int(time.time())
_thread.start_new_thread(delay_unlock,(self.lock, DELAY))
if support.verbose:
print()
print("*** Waiting for thread to release the lock "\
"(approx. %s sec.) ***" % DELAY)
self.lock.acquire()
end_time = int(time.time())
if support.verbose:
print("done")
self.assertGreaterEqual(end_time - start_time, DELAY,
"Blocking by unconditional acquiring failed.")
@mock.patch('time.sleep')
def test_acquire_timeout(self, mock_sleep):
"""Test invoking acquire() with a positive timeout when the lock is
already acquired. Ensure that time.sleep() is invoked with the given
timeout and that False is returned."""
self.lock.acquire()
retval = self.lock.acquire(waitflag=0, timeout=1)
self.assertTrue(mock_sleep.called)
mock_sleep.assert_called_once_with(1)
self.assertEqual(retval, False)
def test_lock_representation(self):
self.lock.acquire()
self.assertIn("locked", repr(self.lock))
self.lock.release()
self.assertIn("unlocked", repr(self.lock))
class MiscTests(unittest.TestCase):
"""Miscellaneous tests."""
def test_exit(self):
self.assertRaises(SystemExit, _thread.exit)
def test_ident(self):
self.assertIsInstance(_thread.get_ident(), int,
"_thread.get_ident() returned a non-integer")
self.assertGreater(_thread.get_ident(), 0)
def test_LockType(self):
self.assertIsInstance(_thread.allocate_lock(), _thread.LockType,
"_thread.LockType is not an instance of what "
"is returned by _thread.allocate_lock()")
def test_set_sentinel(self):
self.assertIsInstance(_thread._set_sentinel(), _thread.LockType,
"_thread._set_sentinel() did not return a "
"LockType instance.")
def test_interrupt_main(self):
#Calling start_new_thread with a function that executes interrupt_main
# should raise KeyboardInterrupt upon completion.
def call_interrupt():
_thread.interrupt_main()
self.assertRaises(KeyboardInterrupt,
_thread.start_new_thread,
call_interrupt,
tuple())
def test_interrupt_in_main(self):
self.assertRaises(KeyboardInterrupt, _thread.interrupt_main)
def test_stack_size_None(self):
retval = _thread.stack_size(None)
self.assertEqual(retval, 0)
def test_stack_size_not_None(self):
with self.assertRaises(_thread.error) as cm:
_thread.stack_size("")
self.assertEqual(cm.exception.args[0],
"setting thread stack size not supported")
class ThreadTests(unittest.TestCase):
"""Test thread creation."""
def test_arg_passing(self):
#Make sure that parameter passing works.
def arg_tester(queue, arg1=False, arg2=False):
"""Use to test _thread.start_new_thread() passes args properly."""
queue.put((arg1, arg2))
testing_queue = queue.Queue(1)
_thread.start_new_thread(arg_tester, (testing_queue, True, True))
result = testing_queue.get()
self.assertTrue(result[0] and result[1],
"Argument passing for thread creation "
"using tuple failed")
_thread.start_new_thread(
arg_tester,
tuple(),
{'queue':testing_queue, 'arg1':True, 'arg2':True})
result = testing_queue.get()
self.assertTrue(result[0] and result[1],
"Argument passing for thread creation "
"using kwargs failed")
_thread.start_new_thread(
arg_tester,
(testing_queue, True),
{'arg2':True})
result = testing_queue.get()
self.assertTrue(result[0] and result[1],
"Argument passing for thread creation using both tuple"
" and kwargs failed")
def test_multi_thread_creation(self):
def queue_mark(queue, delay):
time.sleep(delay)
queue.put(_thread.get_ident())
thread_count = 5
testing_queue = queue.Queue(thread_count)
if support.verbose:
print()
print("*** Testing multiple thread creation "
"(will take approx. %s to %s sec.) ***" % (
DELAY, thread_count))
for count in range(thread_count):
if DELAY:
local_delay = round(random.random(), 1)
else:
local_delay = 0
_thread.start_new_thread(queue_mark,
(testing_queue, local_delay))
time.sleep(DELAY)
if support.verbose:
print('done')
self.assertEqual(testing_queue.qsize(), thread_count,
"Not all %s threads executed properly "
"after %s sec." % (thread_count, DELAY))
def test_args_not_tuple(self):
"""
Test invoking start_new_thread() with a non-tuple value for "args".
Expect TypeError with a meaningful error message to be raised.
"""
with self.assertRaises(TypeError) as cm:
_thread.start_new_thread(mock.Mock(), [])
self.assertEqual(cm.exception.args[0], "2nd arg must be a tuple")
def test_kwargs_not_dict(self):
"""
Test invoking start_new_thread() with a non-dict value for "kwargs".
Expect TypeError with a meaningful error message to be raised.
"""
with self.assertRaises(TypeError) as cm:
_thread.start_new_thread(mock.Mock(), tuple(), kwargs=[])
self.assertEqual(cm.exception.args[0], "3rd arg must be a dict")
def test_SystemExit(self):
"""
Test invoking start_new_thread() with a function that raises
SystemExit.
The exception should be discarded.
"""
func = mock.Mock(side_effect=SystemExit())
try:
_thread.start_new_thread(func, tuple())
except SystemExit:
self.fail("start_new_thread raised SystemExit.")
@mock.patch('traceback.print_exc')
def test_RaiseException(self, mock_print_exc):
"""
Test invoking start_new_thread() with a function that raises exception.
The exception should be discarded and the traceback should be printed
via traceback.print_exc()
"""
func = mock.Mock(side_effect=Exception)
_thread.start_new_thread(func, tuple())
self.assertTrue(mock_print_exc.called)