discovered that subtype_traverse must traverse the type if it is a
heap type, because otherwise some cycles involving a type and its
instance would not be collected. Simplest example:
while 1:
class C(object): pass
C.ref = C()
This program grows without bounds before this fix. (It grows ever
slower since it spends ever more time in the collector.)
Simply adding the right visit() call to subtype_traverse() revealed
other problems. With MvL's help we re-learned that type_clear()
doesn't have to clear *all* references, only the ones that may not be
cleared by other means. Careful analysis (see comments in the code)
revealed that only tp_mro needs to be cleared. (The previous checkin
to this file adds a test for tp_mro==NULL to _PyType_Lookup() that's
essential to prevent crashes due to tp_mro being NULL when
subtype_dealloc() tries to look for a __del__ method.) The same kind
of analysis also revealed that subtype_clear() doesn't need to clear
the instance dict.
With this fix, a useful property of the collector is once again
guaranteed: a single gc.collect() call will clear out all garbage.
(It didn't always before, which put us on the track of this bug.)
Will backport to 2.2.
about the test case, slot_nb_power gets called on behalf of its second
argument, but with a non-None modulus it wouldn't check this, and
believes it is called on behalf of its first argument. Fix this
properly, and get rid of the code in _PyType_Lookup() that tries to
call _PyType_Ready(). But do leave a check for a NULL tp_mro there,
because this can still legitimately occur.
I'll fix this in 2.2.x too.
verbose output to the console, etc.
- Allow Cocoa applets to be built with BuildApplet.
No full testing has been done yet to ensure OS9 operation hasn't suffered.
sentences are separated by two spaces.
Improve _fix_sentence_endings() a bit -- look for ".!?" instead of just
".", and factor out the list of sentence-ending punctuation characters
to a class attribute.
Not sure this is better in all cases.
parse(): Fixed a bug in the output; the dict is referred to in the
code as `countries' not `country'. Also added no-case-fold for the
string "U.S." since the Virgin Islands name no longer wraps those in
parentheses.
main(): Fixed the argument parsing to agree with the docstring, i.e.
--outputdict instead of --output.
In the module docstring:
- updated my email address
- we don't need to explain about Python 1.5 regexps <wink>
We also don't need to wrap the import of re with a try/except.
Other style fixes:
- untabification
- revert back to <> style everywhere (and consistently)
This patch replaces string module functions with string
methods in the Tools/world/world scripts.
It also updates two outdated URLs and the countrycodes
dictionary.
It fixes a bug where result of string.find() was checked
for truth instead of compared with -1.
It also replaces <> with != in two spots.
settimeout(). Already, settimeout() canceled non-blocking mode; now,
setblocking() also cancels the timeout. This is easier to document.
(XXX should settimeout(0) be an alias for setblocking(0)? They seem
to have roughly the same effect. Also, I'm not sure that the code in
connect() and accept() is correct in all cases. We'll sort this out
soon enough.)
not testing it -- apparently test_timeout.py doesn't test anything
useful):
In internal_select():
- The tv_usec part of the timeout for select() was calculated wrong.
- The first argument to select() was one too low.
- The sense of the direction argument to internal_select() was
inverted.
In PySocketSock_settimeout():
- The calls to internal_setblocking() were swapped.
Also, repaired some comments and fixed the test for the return value
of internal_select() in sendall -- this was in the original patch.
I've made considerable changes to Michael's code, specifically to use
the select() system call directly and to store the timeout as a C
double instead of a Python object; internally, -1.0 (or anything
negative) represents the None from the API.
I'm not 100% sure that all corner cases are covered correctly, so
please keep an eye on this. Next I'm going to try it Windows before
Tim complains.
No way is this a bugfix candidate. :-)
I've made considerable changes to Michael's code, specifically to use
the select() system call directly and to store the timeout as a C
double instead of a Python object; internally, -1.0 (or anything
negative) represents the None from the API.
I'm not 100% sure that all corner cases are covered correctly, so
please keep an eye on this. Next I'm going to try it Windows before
Tim complains.
No way is this a bugfix candidate. :-)
Guido van Rossum
Andrew M. Kuchling
Michael W. Hudson
Andrew MacIntyre
Jack Jansen
Martin v. Löwis
Just van Rossum
Greg Ward
Barry Warsaw
Walter Dörwald
Neal Norwitz
Skip Montanaro
Jeremy Hylton
Fred Drake