1# This is a helper module for test_threaded_import.  The test imports this
2# module, and this module tries to run various Python library functions in
3# their own thread, as a side effect of being imported.  If the spawned
4# thread doesn't complete in TIMEOUT seconds, an "appeared to hang" message
5# is appended to the module-global `errors` list.  That list remains empty
6# if (and only if) all functions tested complete.
7
8TIMEOUT = 10
9
10import threading
11
12import tempfile
13import os.path
14
15errors = []
16
17# This class merely runs a function in its own thread T.  The thread importing
18# this module holds the import lock, so if the function called by T tries
19# to do its own imports it will block waiting for this module's import
20# to complete.
21class Worker(threading.Thread):
22    def __init__(self, function, args):
23        threading.Thread.__init__(self)
24        self.function = function
25        self.args = args
26
27    def run(self):
28        self.function(*self.args)
29
30for name, func, args in [
31        # Bug 147376:  TemporaryFile hung on Windows, starting in Python 2.4.
32        ("tempfile.TemporaryFile", lambda: tempfile.TemporaryFile().close(), ()),
33
34        # The real cause for bug 147376:  ntpath.abspath() caused the hang.
35        ("os.path.abspath", os.path.abspath, ('.',)),
36        ]:
37
38    try:
39        t = Worker(func, args)
40        t.start()
41        t.join(TIMEOUT)
42        if t.is_alive():
43            errors.append("%s appeared to hang" % name)
44    finally:
45        del t
46