* Use try/except ImportError or test_support.import_module() to import thread
and threading modules
* Add @unittest.skipUnless(threading, ...) to testcases using threads
calling fork() from a child thread. This disables that unit test (with a note
printed to stderr) on those platforms.
A caveat about buggy platforms is added to the os.fork documentation.
calls threading.currentThread.
The correction somewhat improves the code, but it was close.
Many thanks to the "with" construct, which turns python code into C calls.
I wonder if it is not better to sys.settrace(None) just after
running the __main__ module and before finalization.
up after it was joined had a traceback pointing to that thread's (deleted)
target attribute, while the test was trying to check that the target was
destroyed. Big thanks to Antoine Pitrou for diagnosing the race and pointing
out sys.exc_clear() to kill the exception early. This fixes issue 2496.
failures. The test for enumerate-after-join is now a little less rigorous, but
the bug it references says the error happened in the first couple iterations,
so 100 iterations should still be enough.
cProfile was useful for identifying the slow tests here.
class RunSelfFunction(object):
def __init__(self):
self.thread = threading.Thread(target=self._run)
self.thread.start()
def _run(self):
pass
from creating a permanent cycle between the object and the thread by having the
Thread delete its references to the object when it completes.
As an example of the effect of this bug, paramiko.Transport inherits from
Thread to avoid it.
(in deallocation of running threads, for example), so the PyGILState_Release()
function must still be functional.
On the other hand, _PyGILState_Fini() only frees memory, and can be called later.
Backport candidate, but only after some experts comment on it.
64-bit boxes. I have no idea what the ctypes docs mean
by "integers", and blind-guessing here that it intended to
mean the signed C "int" type, in which case perhaps I can
repair this by feeding the thread id argument to type
ctypes.c_long().
Also made the worker thread daemonic, so it doesn't hang
Python shutdown if the test continues to fail.
PyThreadState_SetAsyncExc(): internal correctness changes wrt
refcount safety and deadlock avoidance. Also added a basic test
case (relying on ctypes) and repaired the docs.
Heavily revised, comprising revisions:
46640 - original trunk revision (backed out in r46655)
46647 - markup fix (backed out in r46655)
46692:46918 merged from branch aimacintyre-sf1454481
branch tested on buildbots (Windows buildbots had problems
not related to these changes).
46640 Patch #1454481: Make thread stack size runtime tunable.
46647 Markup fix
The first is causing many buildbots to fail test runs, and there
are multiple causes with seemingly no immediate prospects for
repairing them. See python-dev discussion.
Note that a branch can (and should) be created for resolving these
problems, like
svn copy svn+ssh://svn.python.org/python/trunk -r46640 svn+ssh://svn.python.org/python/branches/NEW_BRANCH
followed by merging rev 46647 to the new branch.
test_threading.test_foreign_thread(): new test does a basic check that
"foreign" threads can using the threading module, and that they create
a _DummyThread instance in at least one use case. This isn't a very
good test, since a thread created by thread.start_new_thread() isn't
particularly "foreign".
imports e.g. test_support must do so using an absolute package name
such as "import test.test_support" or "from test import test_support".
This also updates the README in Lib/test, and gets rid of the
duplicate data dirctory in Lib/test/data (replaced by
Lib/email/test/data).
Now Tim and Jack can have at it. :)
to stdout. Repaired by not printing at all except in verbose mode.
Made the test about 6x faster -- envelope analysis showed it took time
proportional to the square of the # of tasks. Now it's linear.
Victor Stinner
Gregory P. Smith
Ezio Melotti
Antoine Pitrou
Benjamin Peterson
Georg Brandl
Jesse Noller
Amaury Forgeot d'Arc
Jeffrey Yasskin
Collin Winter
Tim Peters
Andrew MacIntyre
Barry Warsaw
Skip Montanaro