648 lines
20 KiB
Python
648 lines
20 KiB
Python
# Some simple queue module tests, plus some failure conditions
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# to ensure the Queue locks remain stable.
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import itertools
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import random
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import threading
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import time
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import unittest
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import weakref
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from test import support
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from test.support import gc_collect
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py_queue = support.import_fresh_module('queue', blocked=['_queue'])
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c_queue = support.import_fresh_module('queue', fresh=['_queue'])
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need_c_queue = unittest.skipUnless(c_queue, "No _queue module found")
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QUEUE_SIZE = 5
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def qfull(q):
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return q.maxsize > 0 and q.qsize() == q.maxsize
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# A thread to run a function that unclogs a blocked Queue.
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class _TriggerThread(threading.Thread):
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def __init__(self, fn, args):
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self.fn = fn
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self.args = args
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self.startedEvent = threading.Event()
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threading.Thread.__init__(self)
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def run(self):
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# The sleep isn't necessary, but is intended to give the blocking
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# function in the main thread a chance at actually blocking before
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# we unclog it. But if the sleep is longer than the timeout-based
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# tests wait in their blocking functions, those tests will fail.
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# So we give them much longer timeout values compared to the
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# sleep here (I aimed at 10 seconds for blocking functions --
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# they should never actually wait that long - they should make
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# progress as soon as we call self.fn()).
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time.sleep(0.1)
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self.startedEvent.set()
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self.fn(*self.args)
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# Execute a function that blocks, and in a separate thread, a function that
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# triggers the release. Returns the result of the blocking function. Caution:
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# block_func must guarantee to block until trigger_func is called, and
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# trigger_func must guarantee to change queue state so that block_func can make
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# enough progress to return. In particular, a block_func that just raises an
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# exception regardless of whether trigger_func is called will lead to
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# timing-dependent sporadic failures, and one of those went rarely seen but
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# undiagnosed for years. Now block_func must be unexceptional. If block_func
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# is supposed to raise an exception, call do_exceptional_blocking_test()
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# instead.
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class BlockingTestMixin:
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def do_blocking_test(self, block_func, block_args, trigger_func, trigger_args):
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thread = _TriggerThread(trigger_func, trigger_args)
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thread.start()
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try:
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self.result = block_func(*block_args)
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# If block_func returned before our thread made the call, we failed!
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if not thread.startedEvent.is_set():
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self.fail("blocking function %r appeared not to block" %
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block_func)
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return self.result
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finally:
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support.join_thread(thread) # make sure the thread terminates
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# Call this instead if block_func is supposed to raise an exception.
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def do_exceptional_blocking_test(self,block_func, block_args, trigger_func,
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trigger_args, expected_exception_class):
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thread = _TriggerThread(trigger_func, trigger_args)
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thread.start()
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try:
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try:
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block_func(*block_args)
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except expected_exception_class:
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raise
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else:
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self.fail("expected exception of kind %r" %
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expected_exception_class)
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finally:
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support.join_thread(thread) # make sure the thread terminates
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if not thread.startedEvent.is_set():
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self.fail("trigger thread ended but event never set")
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class BaseQueueTestMixin(BlockingTestMixin):
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def setUp(self):
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self.cum = 0
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self.cumlock = threading.Lock()
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def basic_queue_test(self, q):
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if q.qsize():
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raise RuntimeError("Call this function with an empty queue")
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self.assertTrue(q.empty())
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self.assertFalse(q.full())
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# I guess we better check things actually queue correctly a little :)
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q.put(111)
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q.put(333)
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q.put(222)
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target_order = dict(Queue = [111, 333, 222],
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LifoQueue = [222, 333, 111],
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PriorityQueue = [111, 222, 333])
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actual_order = [q.get(), q.get(), q.get()]
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self.assertEqual(actual_order, target_order[q.__class__.__name__],
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"Didn't seem to queue the correct data!")
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for i in range(QUEUE_SIZE-1):
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q.put(i)
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self.assertTrue(q.qsize(), "Queue should not be empty")
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self.assertTrue(not qfull(q), "Queue should not be full")
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last = 2 * QUEUE_SIZE
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full = 3 * 2 * QUEUE_SIZE
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q.put(last)
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self.assertTrue(qfull(q), "Queue should be full")
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self.assertFalse(q.empty())
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self.assertTrue(q.full())
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try:
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q.put(full, block=0)
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self.fail("Didn't appear to block with a full queue")
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except self.queue.Full:
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pass
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try:
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q.put(full, timeout=0.01)
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self.fail("Didn't appear to time-out with a full queue")
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except self.queue.Full:
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pass
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# Test a blocking put
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self.do_blocking_test(q.put, (full,), q.get, ())
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self.do_blocking_test(q.put, (full, True, 10), q.get, ())
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# Empty it
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for i in range(QUEUE_SIZE):
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q.get()
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self.assertTrue(not q.qsize(), "Queue should be empty")
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try:
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q.get(block=0)
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self.fail("Didn't appear to block with an empty queue")
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except self.queue.Empty:
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pass
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try:
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q.get(timeout=0.01)
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self.fail("Didn't appear to time-out with an empty queue")
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except self.queue.Empty:
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pass
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# Test a blocking get
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self.do_blocking_test(q.get, (), q.put, ('empty',))
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self.do_blocking_test(q.get, (True, 10), q.put, ('empty',))
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def worker(self, q):
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while True:
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x = q.get()
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if x < 0:
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q.task_done()
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return
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with self.cumlock:
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self.cum += x
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q.task_done()
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def queue_join_test(self, q):
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self.cum = 0
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threads = []
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for i in (0,1):
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thread = threading.Thread(target=self.worker, args=(q,))
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thread.start()
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threads.append(thread)
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for i in range(100):
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q.put(i)
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q.join()
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self.assertEqual(self.cum, sum(range(100)),
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"q.join() did not block until all tasks were done")
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for i in (0,1):
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q.put(-1) # instruct the threads to close
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q.join() # verify that you can join twice
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for thread in threads:
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thread.join()
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def test_queue_task_done(self):
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# Test to make sure a queue task completed successfully.
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q = self.type2test()
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try:
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q.task_done()
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except ValueError:
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pass
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else:
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self.fail("Did not detect task count going negative")
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def test_queue_join(self):
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# Test that a queue join()s successfully, and before anything else
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# (done twice for insurance).
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q = self.type2test()
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self.queue_join_test(q)
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self.queue_join_test(q)
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try:
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q.task_done()
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except ValueError:
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pass
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else:
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self.fail("Did not detect task count going negative")
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def test_basic(self):
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# Do it a couple of times on the same queue.
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# Done twice to make sure works with same instance reused.
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q = self.type2test(QUEUE_SIZE)
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self.basic_queue_test(q)
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self.basic_queue_test(q)
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def test_negative_timeout_raises_exception(self):
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q = self.type2test(QUEUE_SIZE)
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with self.assertRaises(ValueError):
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q.put(1, timeout=-1)
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with self.assertRaises(ValueError):
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q.get(1, timeout=-1)
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def test_nowait(self):
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q = self.type2test(QUEUE_SIZE)
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for i in range(QUEUE_SIZE):
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q.put_nowait(1)
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with self.assertRaises(self.queue.Full):
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q.put_nowait(1)
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for i in range(QUEUE_SIZE):
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q.get_nowait()
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with self.assertRaises(self.queue.Empty):
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q.get_nowait()
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def test_shrinking_queue(self):
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# issue 10110
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q = self.type2test(3)
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q.put(1)
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q.put(2)
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q.put(3)
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with self.assertRaises(self.queue.Full):
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q.put_nowait(4)
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self.assertEqual(q.qsize(), 3)
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q.maxsize = 2 # shrink the queue
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with self.assertRaises(self.queue.Full):
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q.put_nowait(4)
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class QueueTest(BaseQueueTestMixin):
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def setUp(self):
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self.type2test = self.queue.Queue
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super().setUp()
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class PyQueueTest(QueueTest, unittest.TestCase):
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queue = py_queue
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@need_c_queue
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class CQueueTest(QueueTest, unittest.TestCase):
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queue = c_queue
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class LifoQueueTest(BaseQueueTestMixin):
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def setUp(self):
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self.type2test = self.queue.LifoQueue
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super().setUp()
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class PyLifoQueueTest(LifoQueueTest, unittest.TestCase):
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queue = py_queue
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@need_c_queue
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class CLifoQueueTest(LifoQueueTest, unittest.TestCase):
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queue = c_queue
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class PriorityQueueTest(BaseQueueTestMixin):
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def setUp(self):
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self.type2test = self.queue.PriorityQueue
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super().setUp()
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class PyPriorityQueueTest(PriorityQueueTest, unittest.TestCase):
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queue = py_queue
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@need_c_queue
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class CPriorityQueueTest(PriorityQueueTest, unittest.TestCase):
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queue = c_queue
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# A Queue subclass that can provoke failure at a moment's notice :)
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class FailingQueueException(Exception): pass
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class FailingQueueTest(BlockingTestMixin):
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def setUp(self):
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Queue = self.queue.Queue
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class FailingQueue(Queue):
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def __init__(self, *args):
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self.fail_next_put = False
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self.fail_next_get = False
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Queue.__init__(self, *args)
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def _put(self, item):
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if self.fail_next_put:
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self.fail_next_put = False
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raise FailingQueueException("You Lose")
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return Queue._put(self, item)
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def _get(self):
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if self.fail_next_get:
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self.fail_next_get = False
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raise FailingQueueException("You Lose")
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return Queue._get(self)
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self.FailingQueue = FailingQueue
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super().setUp()
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def failing_queue_test(self, q):
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if q.qsize():
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raise RuntimeError("Call this function with an empty queue")
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for i in range(QUEUE_SIZE-1):
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q.put(i)
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# Test a failing non-blocking put.
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q.fail_next_put = True
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try:
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q.put("oops", block=0)
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self.fail("The queue didn't fail when it should have")
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except FailingQueueException:
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pass
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q.fail_next_put = True
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try:
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q.put("oops", timeout=0.1)
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self.fail("The queue didn't fail when it should have")
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except FailingQueueException:
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pass
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q.put("last")
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self.assertTrue(qfull(q), "Queue should be full")
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# Test a failing blocking put
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q.fail_next_put = True
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try:
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self.do_blocking_test(q.put, ("full",), q.get, ())
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self.fail("The queue didn't fail when it should have")
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except FailingQueueException:
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pass
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# Check the Queue isn't damaged.
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# put failed, but get succeeded - re-add
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q.put("last")
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# Test a failing timeout put
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q.fail_next_put = True
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try:
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self.do_exceptional_blocking_test(q.put, ("full", True, 10), q.get, (),
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FailingQueueException)
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self.fail("The queue didn't fail when it should have")
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except FailingQueueException:
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pass
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# Check the Queue isn't damaged.
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# put failed, but get succeeded - re-add
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q.put("last")
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self.assertTrue(qfull(q), "Queue should be full")
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q.get()
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self.assertTrue(not qfull(q), "Queue should not be full")
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q.put("last")
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self.assertTrue(qfull(q), "Queue should be full")
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# Test a blocking put
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self.do_blocking_test(q.put, ("full",), q.get, ())
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# Empty it
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for i in range(QUEUE_SIZE):
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q.get()
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self.assertTrue(not q.qsize(), "Queue should be empty")
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q.put("first")
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q.fail_next_get = True
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try:
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q.get()
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self.fail("The queue didn't fail when it should have")
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except FailingQueueException:
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pass
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self.assertTrue(q.qsize(), "Queue should not be empty")
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q.fail_next_get = True
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try:
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q.get(timeout=0.1)
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self.fail("The queue didn't fail when it should have")
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except FailingQueueException:
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pass
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self.assertTrue(q.qsize(), "Queue should not be empty")
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q.get()
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self.assertTrue(not q.qsize(), "Queue should be empty")
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q.fail_next_get = True
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try:
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self.do_exceptional_blocking_test(q.get, (), q.put, ('empty',),
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FailingQueueException)
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self.fail("The queue didn't fail when it should have")
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except FailingQueueException:
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pass
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# put succeeded, but get failed.
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self.assertTrue(q.qsize(), "Queue should not be empty")
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q.get()
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self.assertTrue(not q.qsize(), "Queue should be empty")
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def test_failing_queue(self):
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# Test to make sure a queue is functioning correctly.
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# Done twice to the same instance.
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q = self.FailingQueue(QUEUE_SIZE)
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self.failing_queue_test(q)
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self.failing_queue_test(q)
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class PyFailingQueueTest(FailingQueueTest, unittest.TestCase):
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queue = py_queue
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@need_c_queue
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class CFailingQueueTest(FailingQueueTest, unittest.TestCase):
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queue = c_queue
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class BaseSimpleQueueTest:
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def setUp(self):
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self.q = self.type2test()
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def feed(self, q, seq, rnd):
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while True:
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try:
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val = seq.pop()
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except IndexError:
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return
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q.put(val)
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if rnd.random() > 0.5:
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time.sleep(rnd.random() * 1e-3)
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def consume(self, q, results, sentinel):
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while True:
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val = q.get()
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if val == sentinel:
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return
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results.append(val)
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def consume_nonblock(self, q, results, sentinel):
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while True:
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while True:
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try:
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val = q.get(block=False)
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except self.queue.Empty:
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time.sleep(1e-5)
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else:
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break
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if val == sentinel:
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return
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results.append(val)
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def consume_timeout(self, q, results, sentinel):
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while True:
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while True:
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try:
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val = q.get(timeout=1e-5)
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except self.queue.Empty:
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pass
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else:
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break
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if val == sentinel:
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return
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results.append(val)
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def run_threads(self, n_feeders, n_consumers, q, inputs,
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feed_func, consume_func):
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results = []
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sentinel = None
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seq = inputs + [sentinel] * n_consumers
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seq.reverse()
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rnd = random.Random(42)
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exceptions = []
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def log_exceptions(f):
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def wrapper(*args, **kwargs):
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try:
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f(*args, **kwargs)
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except BaseException as e:
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exceptions.append(e)
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return wrapper
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feeders = [threading.Thread(target=log_exceptions(feed_func),
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args=(q, seq, rnd))
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for i in range(n_feeders)]
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consumers = [threading.Thread(target=log_exceptions(consume_func),
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args=(q, results, sentinel))
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for i in range(n_consumers)]
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with support.start_threads(feeders + consumers):
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pass
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self.assertFalse(exceptions)
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self.assertTrue(q.empty())
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self.assertEqual(q.qsize(), 0)
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return results
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def test_basic(self):
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# Basic tests for get(), put() etc.
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q = self.q
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self.assertTrue(q.empty())
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self.assertEqual(q.qsize(), 0)
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q.put(1)
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self.assertFalse(q.empty())
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self.assertEqual(q.qsize(), 1)
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q.put(2)
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q.put_nowait(3)
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q.put(4)
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self.assertFalse(q.empty())
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self.assertEqual(q.qsize(), 4)
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self.assertEqual(q.get(), 1)
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self.assertEqual(q.qsize(), 3)
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self.assertEqual(q.get_nowait(), 2)
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self.assertEqual(q.qsize(), 2)
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self.assertEqual(q.get(block=False), 3)
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self.assertFalse(q.empty())
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self.assertEqual(q.qsize(), 1)
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self.assertEqual(q.get(timeout=0.1), 4)
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self.assertTrue(q.empty())
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self.assertEqual(q.qsize(), 0)
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with self.assertRaises(self.queue.Empty):
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q.get(block=False)
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with self.assertRaises(self.queue.Empty):
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q.get(timeout=1e-3)
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with self.assertRaises(self.queue.Empty):
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q.get_nowait()
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self.assertTrue(q.empty())
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self.assertEqual(q.qsize(), 0)
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|
|
|
def test_negative_timeout_raises_exception(self):
|
|
q = self.q
|
|
q.put(1)
|
|
with self.assertRaises(ValueError):
|
|
q.get(timeout=-1)
|
|
|
|
def test_order(self):
|
|
# Test a pair of concurrent put() and get()
|
|
q = self.q
|
|
inputs = list(range(100))
|
|
results = self.run_threads(1, 1, q, inputs, self.feed, self.consume)
|
|
|
|
# One producer, one consumer => results appended in well-defined order
|
|
self.assertEqual(results, inputs)
|
|
|
|
def test_many_threads(self):
|
|
# Test multiple concurrent put() and get()
|
|
N = 50
|
|
q = self.q
|
|
inputs = list(range(10000))
|
|
results = self.run_threads(N, N, q, inputs, self.feed, self.consume)
|
|
|
|
# Multiple consumers without synchronization append the
|
|
# results in random order
|
|
self.assertEqual(sorted(results), inputs)
|
|
|
|
def test_many_threads_nonblock(self):
|
|
# Test multiple concurrent put() and get(block=False)
|
|
N = 50
|
|
q = self.q
|
|
inputs = list(range(10000))
|
|
results = self.run_threads(N, N, q, inputs,
|
|
self.feed, self.consume_nonblock)
|
|
|
|
self.assertEqual(sorted(results), inputs)
|
|
|
|
def test_many_threads_timeout(self):
|
|
# Test multiple concurrent put() and get(timeout=...)
|
|
N = 50
|
|
q = self.q
|
|
inputs = list(range(1000))
|
|
results = self.run_threads(N, N, q, inputs,
|
|
self.feed, self.consume_timeout)
|
|
|
|
self.assertEqual(sorted(results), inputs)
|
|
|
|
def test_references(self):
|
|
# The queue should lose references to each item as soon as
|
|
# it leaves the queue.
|
|
class C:
|
|
pass
|
|
|
|
N = 20
|
|
q = self.q
|
|
for i in range(N):
|
|
q.put(C())
|
|
for i in range(N):
|
|
wr = weakref.ref(q.get())
|
|
gc_collect() # For PyPy or other GCs.
|
|
self.assertIsNone(wr())
|
|
|
|
|
|
class PySimpleQueueTest(BaseSimpleQueueTest, unittest.TestCase):
|
|
|
|
queue = py_queue
|
|
def setUp(self):
|
|
self.type2test = self.queue._PySimpleQueue
|
|
super().setUp()
|
|
|
|
|
|
@need_c_queue
|
|
class CSimpleQueueTest(BaseSimpleQueueTest, unittest.TestCase):
|
|
|
|
queue = c_queue
|
|
|
|
def setUp(self):
|
|
self.type2test = self.queue.SimpleQueue
|
|
super().setUp()
|
|
|
|
def test_is_default(self):
|
|
self.assertIs(self.type2test, self.queue.SimpleQueue)
|
|
self.assertIs(self.type2test, self.queue.SimpleQueue)
|
|
|
|
def test_reentrancy(self):
|
|
# bpo-14976: put() may be called reentrantly in an asynchronous
|
|
# callback.
|
|
q = self.q
|
|
gen = itertools.count()
|
|
N = 10000
|
|
results = []
|
|
|
|
# This test exploits the fact that __del__ in a reference cycle
|
|
# can be called any time the GC may run.
|
|
|
|
class Circular(object):
|
|
def __init__(self):
|
|
self.circular = self
|
|
|
|
def __del__(self):
|
|
q.put(next(gen))
|
|
|
|
while True:
|
|
o = Circular()
|
|
q.put(next(gen))
|
|
del o
|
|
results.append(q.get())
|
|
if results[-1] >= N:
|
|
break
|
|
|
|
self.assertEqual(results, list(range(N + 1)))
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|