Re: Refcount problem in ceval.c
Christian Heimes [EMAIL PROTECTED] writes: Berthold Höllmann wrote: Is there any common reason to for such a strange object on the command stack, or is it more likely that any of my extension modules is causing havoc? It's very likely that your extension has a reference counting bug. It looks like you are either missing a Py_INCREF or you have a Py_DECREF too much. Newly freed memory is filled with 0xDB (see Objects/obmalloc.c DEADBYTE). I was suspecting this, that's why I build the debugging version of Python. I hoped I would get the error message somewhere near the code causing the error, but I seems i have to continue the search. Wild guess: Are you using PyModule_AddObject with a PyTypeObject w/o Py_INCREF()ing the type object first? That would have been easy :-) I have only one occurrence of PyModule_AddObject, and its PyTypeObject is Py_INCREF()ed Thanks Berthold -- __ Address: G / \ L Germanischer Lloyd phone: +49-40-36149-7374 -++- Vorsetzen 35 P.O.Box 111606 fax : +49-40-36149-7320 \__/ D-20459 HamburgD-20416 Hamburg pgpRObfd5AOUq.pgp Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Refcount problem in ceval.c
Berthold Höllmann wrote: Is there any common reason to for such a strange object on the command stack, or is it more likely that any of my extension modules is causing havoc? It's very likely that your extension has a reference counting bug. It looks like you are either missing a Py_INCREF or you have a Py_DECREF too much. Newly freed memory is filled with 0xDB (see Objects/obmalloc.c DEADBYTE). Wild guess: Are you using PyModule_AddObject with a PyTypeObject w/o Py_INCREF()ing the type object first? Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: refcount
Benjamin [EMAIL PROTECTED] wrote: [ help(sys.getrefcount) says: ] [ ... ] The count returned is generally one higher than you might expect, because it includes the (temporary) reference as an argument to getrefcount(). Are there any cases when it wouldn't? When the temporary reference which is the argument to getrefcount is the *only* reference, eg: sys.getrefcount (set()) 1 The return value for a weakly referenced object may also be not what you expect: s = set() sys.getrefcount(s) 2 r = weakref.ref(s) r() is s True sys.getrefcount(r()) 2 -- \S -- [EMAIL PROTECTED] -- http://www.chaos.org.uk/~sion/ Frankly I have no feelings towards penguins one way or the other -- Arthur C. Clarke her nu becomeþ se bera eadward ofdun hlæddre heafdes bæce bump bump bump -- http://mail.python.org/mailman/listinfo/python-list
Re: refcount
Simon Pickles [EMAIL PROTECTED] wrote: Is is possible to access the refcount for an object? import sys sys.getrefcount(42) 6 Ideally, I am looking to see if I have a refcount of 1 before calling del That's a pointless exercise: you probably don't understand what del does. All that del does is remove one reference from an object, either by removing a name from the namespace, or by removing a reference from something like a list. 'del x' does NOT destroy the object referenced by x, unless it happens that there are no other references to the object. Also note that the only time you will see a reference count of 1 is on an object which you cannot otherwise access (the only reference is being used for the call to getrefcount()): x = 9 sys.getrefcount(x) 2 -- http://mail.python.org/mailman/listinfo/python-list
Re: refcount
On Jan 29, 5:46 am, Christian Heimes [EMAIL PROTECTED] wrote: Simon Pickles wrote: Hi, Is is possible to access the refcount for an object? Ideally, I am looking to see if I have a refcount of 1 before calling del Help on built-in function getrefcount in module sys: getrefcount(...) getrefcount(object) - integer Return the reference count of object. The count returned is generally one higher than you might expect, because it includes the (temporary) reference as an argument to getrefcount(). Are there any cases when it wouldn't? Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: refcount
Benjamin wrote: On Jan 29, 5:46 am, Christian Heimes [EMAIL PROTECTED] wrote: Simon Pickles wrote: Hi, Is is possible to access the refcount for an object? Ideally, I am looking to see if I have a refcount of 1 before calling del Help on built-in function getrefcount in module sys: getrefcount(...) getrefcount(object) - integer Return the reference count of object. The count returned is generally one higher than you might expect, because it includes the (temporary) reference as an argument to getrefcount(). Are there any cases when it wouldn't? Well, as long as the object is named object in sys.getrefcount's namespace, there's at least that one reference to it... Mel. -- http://mail.python.org/mailman/listinfo/python-list
Re: refcount
Simon Pickles wrote: Hi, Is is possible to access the refcount for an object? Ideally, I am looking to see if I have a refcount of 1 before calling del Help on built-in function getrefcount in module sys: getrefcount(...) getrefcount(object) - integer Return the reference count of object. The count returned is generally one higher than you might expect, because it includes the (temporary) reference as an argument to getrefcount(). Christian -- http://mail.python.org/mailman/listinfo/python-list
