symbian-qemu-0.9.1-12/python-2.6.1/Lib/test/test_threadedtempfile.py
author William Roberts <williamr@symbian.org>
Tue, 04 Aug 2009 11:50:27 +0100
changeset 3 c2946f91d81f
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Automated conversion of relative paths to new source layout
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"""
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Create and delete FILES_PER_THREAD temp files (via tempfile.TemporaryFile)
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in each of NUM_THREADS threads, recording the number of successes and
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failures.  A failure is a bug in tempfile, and may be due to:
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+ Trying to create more than one tempfile with the same name.
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+ Trying to delete a tempfile that doesn't still exist.
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+ Something we've never seen before.
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By default, NUM_THREADS == 20 and FILES_PER_THREAD == 50.  This is enough to
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create about 150 failures per run under Win98SE in 2.0, and runs pretty
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quickly. Guido reports needing to boost FILES_PER_THREAD to 500 before
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provoking a 2.0 failure under Linux.
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"""
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NUM_THREADS = 20
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FILES_PER_THREAD = 50
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import thread # If this fails, we can't test this module
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import threading
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import tempfile
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from test.test_support import threading_setup, threading_cleanup, run_unittest
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import unittest
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import StringIO
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from traceback import print_exc
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startEvent = threading.Event()
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class TempFileGreedy(threading.Thread):
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    error_count = 0
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    ok_count = 0
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    def run(self):
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        self.errors = StringIO.StringIO()
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        startEvent.wait()
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        for i in range(FILES_PER_THREAD):
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            try:
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                f = tempfile.TemporaryFile("w+b")
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                f.close()
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            except:
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                self.error_count += 1
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                print_exc(file=self.errors)
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            else:
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                self.ok_count += 1
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class ThreadedTempFileTest(unittest.TestCase):
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    def test_main(self):
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        threads = []
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        thread_info = threading_setup()
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        for i in range(NUM_THREADS):
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            t = TempFileGreedy()
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            threads.append(t)
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            t.start()
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        startEvent.set()
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        ok = 0
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        errors = []
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        for t in threads:
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            t.join()
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            ok += t.ok_count
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            if t.error_count:
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                errors.append(str(t.getName()) + str(t.errors.getvalue()))
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        threading_cleanup(*thread_info)
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        msg = "Errors: errors %d ok %d\n%s" % (len(errors), ok,
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            '\n'.join(errors))
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        self.assertEquals(errors, [], msg)
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        self.assertEquals(ok, NUM_THREADS * FILES_PER_THREAD)
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def test_main():
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    run_unittest(ThreadedTempFileTest)
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if __name__ == "__main__":
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    test_main()