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authorKim Motoyoshi Kalland <kim.kalland@nokia.com>2010-07-28 10:40:30 (GMT)
committerKim Motoyoshi Kalland <kim.kalland@nokia.com>2010-07-28 10:50:13 (GMT)
commit26b46c24f4b8dcac6f55cb01b53187be53389e4b (patch)
tree4d7c301a2fcbb1a698eaeefd0f55334a292be90f /doc/src/snippets/code/doc_src_groups.qdoc
parent75f5b49b9a722c5f3827ea538e13a69dff1d8c78 (diff)
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Fix compilation on 64-bit Windows.
When compiling for 64-bit with Visual Studio 2008, inline assembly is not supported. Use intrisic instead. Reviewed-by: Benjamin Poulain
Diffstat (limited to 'doc/src/snippets/code/doc_src_groups.qdoc')
0 files changed, 0 insertions, 0 deletions
generated by cgit v0.12 at 2025-11-02 19:09:20 (GMT)
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import test.support

# Skip tests if _multiprocessing wasn't built.
test.support.import_module('_multiprocessing')
# Skip tests if sem_open implementation is broken.
test.support.import_module('multiprocessing.synchronize')
# import threading after _multiprocessing to raise a more relevant error
# message: "No module named _multiprocessing". _multiprocessing is not compiled
# without thread support.
test.support.import_module('threading')

from test.support.script_helper import assert_python_ok

import os
import sys
import threading
import time
import unittest
import weakref

from concurrent import futures
from concurrent.futures._base import (
    PENDING, RUNNING, CANCELLED, CANCELLED_AND_NOTIFIED, FINISHED, Future)
from concurrent.futures.process import BrokenProcessPool


def create_future(state=PENDING, exception=None, result=None):
    f = Future()
    f._state = state
    f._exception = exception
    f._result = result
    return f


PENDING_FUTURE = create_future(state=PENDING)
RUNNING_FUTURE = create_future(state=RUNNING)
CANCELLED_FUTURE = create_future(state=CANCELLED)
CANCELLED_AND_NOTIFIED_FUTURE = create_future(state=CANCELLED_AND_NOTIFIED)
EXCEPTION_FUTURE = create_future(state=FINISHED, exception=OSError())
SUCCESSFUL_FUTURE = create_future(state=FINISHED, result=42)


def mul(x, y):
    return x * y


def sleep_and_raise(t):
    time.sleep(t)
    raise Exception('this is an exception')

def sleep_and_print(t, msg):
    time.sleep(t)
    print(msg)
    sys.stdout.flush()


class MyObject(object):
    def my_method(self):
        pass


class ExecutorMixin:
    worker_count = 5

    def setUp(self):
        self.t1 = time.time()
        try:
            self.executor = self.executor_type(max_workers=self.worker_count)
        except NotImplementedError as e:
            self.skipTest(str(e))
        self._prime_executor()

    def tearDown(self):
        self.executor.shutdown(wait=True)
        dt = time.time() - self.t1
        if test.support.verbose:
            print("%.2fs" % dt, end=' ')
        self.assertLess(dt, 60, "synchronization issue: test lasted too long")

    def _prime_executor(self):
        # Make sure that the executor is ready to do work before running the
        # tests. This should reduce the probability of timeouts in the tests.
        futures = [self.executor.submit(time.sleep, 0.1)
                   for _ in range(self.worker_count)]

        for f in futures:
            f.result()


class ThreadPoolMixin(ExecutorMixin):
    executor_type = futures.ThreadPoolExecutor


class ProcessPoolMixin(ExecutorMixin):
    executor_type = futures.ProcessPoolExecutor


class ExecutorShutdownTest:
    def test_run_after_shutdown(self):
        self.executor.shutdown()
        self.assertRaises(RuntimeError,
                          self.executor.submit,
                          pow, 2, 5)

    def test_interpreter_shutdown(self):
        # Test the atexit hook for shutdown of worker threads and processes
        rc, out, err = assert_python_ok('-c', """if 1:
            from concurrent.futures import {executor_type}
            from time import sleep
            from test.test_concurrent_futures import sleep_and_print
            t = {executor_type}(5)
            t.submit(sleep_and_print, 1.0, "apple")
            """.format(executor_type=self.executor_type.__name__))
        # Errors in atexit hooks don't change the process exit code, check
        # stderr manually.
        self.assertFalse(err)
        self.assertEqual(out.strip(), b"apple")

    def test_hang_issue12364(self):
        fs = [self.executor.submit(time.sleep, 0.1) for _ in range(50)]
        self.executor.shutdown()
        for f in fs:
            f.result()


class ThreadPoolShutdownTest(ThreadPoolMixin, ExecutorShutdownTest, unittest.TestCase):
    def _prime_executor(self):
        pass

    def test_threads_terminate(self):
        self.executor.submit(mul, 21, 2)
        self.executor.submit(mul, 6, 7)
        self.executor.submit(mul, 3, 14)
        self.assertEqual(len(self.executor._threads), 3)
        self.executor.shutdown()
        for t in self.executor._threads:
            t.join()

    def test_context_manager_shutdown(self):
        with futures.ThreadPoolExecutor(max_workers=5) as e:
            executor = e
            self.assertEqual(list(e.map(abs, range(-5, 5))),
                             [5, 4, 3, 2, 1, 0, 1, 2, 3, 4])

        for t in executor._threads:
            t.join()

    def test_del_shutdown(self):
        executor = futures.ThreadPoolExecutor(max_workers=5)
        executor.map(abs, range(-5, 5))
        threads = executor._threads
        del executor

        for t in threads:
            t.join()

    def test_thread_names_assigned(self):
        executor = futures.ThreadPoolExecutor(
            max_workers=5, thread_name_prefix='SpecialPool')
        executor.map(abs, range(-5, 5))
        threads = executor._threads
        del executor

        for t in threads:
            self.assertRegex(t.name, r'^SpecialPool_[0-4]$')
            t.join()

    def test_thread_names_default(self):
        executor = futures.ThreadPoolExecutor(max_workers=5)
        executor.map(abs, range(-5, 5))
        threads = executor._threads
        del executor

        for t in threads:
            # We don't particularly care what the default name is, just that
            # it has a default name implying that it is a ThreadPoolExecutor
            # followed by what looks like a thread number.
            self.assertRegex(t.name, r'^.*ThreadPoolExecutor.*_[0-4]$')
            t.join()


class ProcessPoolShutdownTest(ProcessPoolMixin, ExecutorShutdownTest, unittest.TestCase):
    def _prime_executor(self):
        pass

    def test_processes_terminate(self):
        self.executor.submit(mul, 21, 2)
        self.executor.submit(mul, 6, 7)
        self.executor.submit(mul, 3, 14)
        self.assertEqual(len(self.executor._processes), 5)
        processes = self.executor._processes
        self.executor.shutdown()

        for p in processes.values():
            p.join()

    def test_context_manager_shutdown(self):
        with futures.ProcessPoolExecutor(max_workers=5) as e:
            processes = e._processes
            self.assertEqual(list(e.map(abs, range(-5, 5))),
                             [5, 4, 3, 2, 1, 0, 1, 2, 3, 4])

        for p in processes.values():
            p.join()

    def test_del_shutdown(self):
        executor = futures.ProcessPoolExecutor(max_workers=5)
        list(executor.map(abs, range(-5, 5)))
        queue_management_thread = executor._queue_management_thread
        processes = executor._processes
        del executor

        queue_management_thread.join()
        for p in processes.values():
            p.join()


class WaitTests:

    def test_first_completed(self):
        future1 = self.executor.submit(mul, 21, 2)
        future2 = self.executor.submit(time.sleep, 1.5)

        done, not_done = futures.wait(
                [CANCELLED_FUTURE, future1, future2],
                 return_when=futures.FIRST_COMPLETED)

        self.assertEqual(set([future1]), done)
        self.assertEqual(set([CANCELLED_FUTURE, future2]), not_done)

    def test_first_completed_some_already_completed(self):
        future1 = self.executor.submit(time.sleep, 1.5)

        finished, pending = futures.wait(
                 [CANCELLED_AND_NOTIFIED_FUTURE, SUCCESSFUL_FUTURE, future1],
                 return_when=futures.FIRST_COMPLETED)

        self.assertEqual(
                set([CANCELLED_AND_NOTIFIED_FUTURE, SUCCESSFUL_FUTURE]),
                finished)
        self.assertEqual(set([future1]), pending)

    def test_first_exception(self):
        future1 = self.executor.submit(mul, 2, 21)
        future2 = self.executor.submit(sleep_and_raise, 1.5)
        future3 = self.executor.submit(time.sleep, 3)

        finished, pending = futures.wait(
                [future1, future2, future3],
                return_when=futures.FIRST_EXCEPTION)

        self.assertEqual(set([future1, future2]), finished)
        self.assertEqual(set([future3]), pending)

    def test_first_exception_some_already_complete(self):
        future1 = self.executor.submit(divmod, 21, 0)
        future2 = self.executor.submit(time.sleep, 1.5)

        finished, pending = futures.wait(
                [SUCCESSFUL_FUTURE,
                 CANCELLED_FUTURE,
                 CANCELLED_AND_NOTIFIED_FUTURE,
                 future1, future2],
                return_when=futures.FIRST_EXCEPTION)

        self.assertEqual(set([SUCCESSFUL_FUTURE,
                              CANCELLED_AND_NOTIFIED_FUTURE,
                              future1]), finished)
        self.assertEqual(set([CANCELLED_FUTURE, future2]), pending)

    def test_first_exception_one_already_failed(self):
        future1 = self.executor.submit(time.sleep, 2)

        finished, pending = futures.wait(
                 [EXCEPTION_FUTURE, future1],
                 return_when=futures.FIRST_EXCEPTION)

        self.assertEqual(set([EXCEPTION_FUTURE]), finished)
        self.assertEqual(set([future1]), pending)

    def test_all_completed(self):
        future1 = self.executor.submit(divmod, 2, 0)
        future2 = self.executor.submit(mul, 2, 21)

        finished, pending = futures.wait(
                [SUCCESSFUL_FUTURE,
                 CANCELLED_AND_NOTIFIED_FUTURE,
                 EXCEPTION_FUTURE,
                 future1,
                 future2],
                return_when=futures.ALL_COMPLETED)

        self.assertEqual(set([SUCCESSFUL_FUTURE,
                              CANCELLED_AND_NOTIFIED_FUTURE,
                              EXCEPTION_FUTURE,
                              future1,
                              future2]), finished)
        self.assertEqual(set(), pending)

    def test_timeout(self):
        future1 = self.executor.submit(mul, 6, 7)
        future2 = self.executor.submit(time.sleep, 6)

        finished, pending = futures.wait(
                [CANCELLED_AND_NOTIFIED_FUTURE,
                 EXCEPTION_FUTURE,
                 SUCCESSFUL_FUTURE,
                 future1, future2],
                timeout=5,
                return_when=futures.ALL_COMPLETED)

        self.assertEqual(set([CANCELLED_AND_NOTIFIED_FUTURE,
                              EXCEPTION_FUTURE,
                              SUCCESSFUL_FUTURE,
                              future1]), finished)
        self.assertEqual(set([future2]), pending)


class ThreadPoolWaitTests(ThreadPoolMixin, WaitTests, unittest.TestCase):

    def test_pending_calls_race(self):
        # Issue #14406: multi-threaded race condition when waiting on all
        # futures.
        event = threading.Event()
        def future_func():
            event.wait()
        oldswitchinterval = sys.getswitchinterval()
        sys.setswitchinterval(1e-6)
        try:
            fs = {self.executor.submit(future_func) for i in range(100)}
            event.set()
            futures.wait(fs, return_when=futures.ALL_COMPLETED)
        finally:
            sys.setswitchinterval(oldswitchinterval)


class ProcessPoolWaitTests(ProcessPoolMixin, WaitTests, unittest.TestCase):
    pass


class AsCompletedTests:
    # TODO(brian@sweetapp.com): Should have a test with a non-zero timeout.
    def test_no_timeout(self):
        future1 = self.executor.submit(mul, 2, 21)
        future2 = self.executor.submit(mul, 7, 6)

        completed = set(futures.as_completed(
                [CANCELLED_AND_NOTIFIED_FUTURE,
                 EXCEPTION_FUTURE,
                 SUCCESSFUL_FUTURE,
                 future1, future2]))
        self.assertEqual(set(
                [CANCELLED_AND_NOTIFIED_FUTURE,
                 EXCEPTION_FUTURE,
                 SUCCESSFUL_FUTURE,
                 future1, future2]),
                completed)

    def test_zero_timeout(self):
        future1 = self.executor.submit(time.sleep, 2)
        completed_futures = set()
        try:
            for future in futures.as_completed(
                    [CANCELLED_AND_NOTIFIED_FUTURE,
                     EXCEPTION_FUTURE,
                     SUCCESSFUL_FUTURE,
                     future1],
                    timeout=0):
                completed_futures.add(future)
        except futures.TimeoutError:
            pass

        self.assertEqual(set([CANCELLED_AND_NOTIFIED_FUTURE,
                              EXCEPTION_FUTURE,
                              SUCCESSFUL_FUTURE]),
                         completed_futures)

    def test_duplicate_futures(self):
        # Issue 20367. Duplicate futures should not raise exceptions or give
        # duplicate responses.
        future1 = self.executor.submit(time.sleep, 2)
        completed = [f for f in futures.as_completed([future1,future1])]
        self.assertEqual(len(completed), 1)


class ThreadPoolAsCompletedTests(ThreadPoolMixin, AsCompletedTests, unittest.TestCase):
    pass


class ProcessPoolAsCompletedTests(ProcessPoolMixin, AsCompletedTests, unittest.TestCase):
    pass


class ExecutorTest:
    # Executor.shutdown() and context manager usage is tested by
    # ExecutorShutdownTest.
    def test_submit(self):
        future = self.executor.submit(pow, 2, 8)
        self.assertEqual(256, future.result())

    def test_submit_keyword(self):
        future = self.executor.submit(mul, 2, y=8)
        self.assertEqual(16, future.result())

    def test_map(self):
        self.assertEqual(
                list(self.executor.map(pow, range(10), range(10))),
                list(map(pow, range(10), range(10))))

    def test_map_exception(self):
        i = self.executor.map(divmod, [1, 1, 1, 1], [2, 3, 0, 5])
        self.assertEqual(i.__next__(), (0, 1))
        self.assertEqual(i.__next__(), (0, 1))
        self.assertRaises(ZeroDivisionError, i.__next__)

    def test_map_timeout(self):
        results = []
        try:
            for i in self.executor.map(time.sleep,
                                       [0, 0, 6],
                                       timeout=5):
                results.append(i)
        except futures.TimeoutError:
            pass
        else:
            self.fail('expected TimeoutError')

        self.assertEqual([None, None], results)

    def test_shutdown_race_issue12456(self):
        # Issue #12456: race condition at shutdown where trying to post a
        # sentinel in the call queue blocks (the queue is full while processes
        # have exited).
        self.executor.map(str, [2] * (self.worker_count + 1))
        self.executor.shutdown()

    @test.support.cpython_only
    def test_no_stale_references(self):
        # Issue #16284: check that the executors don't unnecessarily hang onto
        # references.
        my_object = MyObject()
        my_object_collected = threading.Event()
        my_object_callback = weakref.ref(