Re: [Python-Dev] Help with a book
On 11/25/2015 12:31 PM, Jacob Zimmerman wrote: I appreciate any help anyone can give to assist in making this book as great as it can be. I'm a pretty good editor, and have used descriptors quite a bit. I'd be happy to help. -- ~Ethan~ ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] crash bug in weakref_richcompare?
On 11/26/2015 06:06 PM, Luke Deller wrote: I have come across some dubious code in Objects/weakrefobject.c which looks like a bug to me, but wanted to run it past others. This was discovered from looking at crash dumps from a multithreaded python app (using Python 2.7.9, but the same weakref code exists in 3.5 and hg tip). The code that worries me is at the end of the "weakref_richcompare" function: return PyObject_RichCompare(PyWeakref_GET_OBJECT(self), PyWeakref_GET_OBJECT(other), op); At this point the code has established that the referents are still alive, and it is trying to compare the referents. However it has not acquired a strong reference to the referents, so I think it is possible for one of them to be deleted half way through this comparison. This can lead to a crash, because PyObject_RichCompare assumes that the PyObject*'s it was passed will remain usable for the duration of the call. The crashes I have seen involve data corruption consistent with one of these PyObject's being deleted and the memory reused for something else, eg: 00 python27!try_3way_compare+0x15 [objects\object.c @ 712] 01 python27!try_3way_to_rich_compare+0xb [objects\object.c @ 901] 02 python27!do_richcmp+0x2c [objects\object.c @ 935] 03 python27!PyObject_RichCompare+0x99 [objects\object.c @ 982] 04 python27!weakref_richcompare+0x6a [objects\weakrefobject.c @ 212] (In this example v->ob_type was 0x5f637865 which is ASCII "exc_", not a valid pointer at all) Other places in weakrefobject.c seem to have a similar weakness, eg in weakref_hash and weakref_repr. I have not been able to produce a small test case to exhibit this crash, but from this inspection of the code it looks like a bug - am I understanding this correctly? Luke, go ahead and open an issue on the bug tracker [1] for this; email threads are too easily lost. -- ~Ethan~ [1] bugs.python.org ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
[Python-Dev] Can not pass configuration on mac os
Hi, I am new here wishing to contribute to python. I tried to go through the tutorial for seting up Cpython, while I cannot pass the configuration. My system is Mac OS and I have installed the command tool of Xcode and hg. But on terminal it said that no such file or directory when I type “./configure --with-pydebug”. What was wrong with my action? How can I fix the issue? This may a little question, but thanks for your help and tutoring! Sincerely, Chongzhao Mao___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Can not pass configuration on mac os
The best to get help is the tutor mailing list: https://mail.python.org/mailman/listinfo/tutor . After that you can get help contributing by reading https://docs.python.org/devguide/ . On Sat, 28 Nov 2015, 18:53 maochongzhao <15834119...@163.com> wrote: > Hi, > > I am new here wishing to contribute to python. > > I tried to go through the tutorial for seting up Cpython, while I cannot > pass the configuration. My system is Mac OS and I have installed the > command tool of Xcode and hg. But on terminal it said that no such file or > directory when I type “./configure --with-pydebug”. What was wrong with > my action? How can I fix the issue? > > This may a little question, but thanks for your help and tutoring! > > > Sincerely, > > Chongzhao Mao > ___ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/brett%40python.org > ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
