Gray,
Please create a simple memalign() which simply prints a warning (on 1st invocation) and calls malloc() without regard to alignments. I have not seen a...
Robert D. Johnson
rjohnson@...
Nov 6, 1998 7:59 pm
6
We have a ton of code which initializes a ptr to NULL, then does free(ptr) later regardless of whether a malloc had been done. The documentation on Solaris...
Robert D. Johnson
rjohnson@...
Nov 6, 1998 8:04 pm
7
... Sorry Robert. I've always disagreed with this. I always do a: if (pnt != NULL) { free(pnt); } I think that freeing of NULLs is not good form and should...
Gray Watson
gray@...
Nov 9, 1998 3:51 pm
8
... First, I must say "thank you" for all your dmalloc work. I mean no disrespect. I am just trying help. ISO Standards discuss free(NULL) at: ...
Robert D. Johnson
RJohnson@...
Nov 9, 1998 5:37 pm
9
... I would say: 1) You can argue over whether the design is a good idea or not, however this is mostly a moot point. 2) You can assert that it's not portable...
Randell Jesup
rjesup@...
Nov 9, 1998 5:53 pm
10
... Good idea Robert. It has been completed as described above and is in my main source tree. A 4.1.0-beta version has been posted. Not too well tested. It...
Gray Watson
gray@...
Nov 9, 1998 7:46 pm
11
... Right. My guess is that memalign might have been more important 10 years ago, but perhaps not as important these days? I think it was used for speed,...
Robert D. Johnson
RJohnson@...
Nov 9, 1998 9:26 pm
12
... You haven't tried to use my system while I'm building a browser image... ;-) 128MB made it usable while doing the AR's and links; 64MB was unusable...
Randell Jesup
rjesup@...
Nov 10, 1998 2:04 am
13
So instead of an argument of semi-religious nature how about we utilize the egroups poll mechanisms. By default, should dmalloc allow by default the free (or ...
gwatson@...
Nov 10, 1998 5:35 pm
14
--w4C4UTlrpi Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Hi, dmalloc is a very fine package. However, I am offering the...
Jens Krinke
j.krinke@...
Nov 10, 1998 5:37 pm
15
... Regardless of the result, I think the documentation in settings.dist for free(0) needs to be changed to note that POSIX/ANSI/Unix/etc allow free(0)....
Randell Jesup
rjesup@...
Nov 10, 1998 7:36 pm
16
... `delete 0' is explicitly allowed by the C++ Standard, so, if free(0) is disallowed by dmalloc, operator delete should mask it. I don't care too much about...
Alexandre Oliva
oliva@...
Nov 10, 1998 8:05 pm
17
I still maintain that you should fix errant code. Due to the varying nature of runtimes and implementations of the C and various malloc libraries, you can't...
Scott Michel
scottm@...
Nov 10, 1998 8:46 pm
18
... Is this really true? Do we have a single real example of this, let alone enough to worry about? ... Hey, I hacked that game in Fortran (ok, so it wasn't...
Randell Jesup
rjesup@...
Nov 10, 1998 10:42 pm
19
... Careful - 0x00000000 being inaccessible and issues of free(0) are NOT linked. The whole point is that POSIX and all Unixes/PC compilers I know of...
Randell Jesup
rjesup@...
Nov 11, 1998 2:26 am
20
Hi everybody. I also found that free(NULL) is allowed by ANSI. But I belive it was included as a special case (with side effects) just to avoid invalidating...
Erick Recio
ferma@...
Nov 11, 1998 8:22 am
21
... AIX for one, at least the last time I ported to it. It's relatively common for the OS to make the page 0 PTE inaccessible. Used to be the case for Linux at...
Scott Michel
scottm@...
Nov 11, 1998 2:10 pm
22
... Hi everybody. I also found that free(NULL) is allowed by ANSI. But I belive it was included as a special case (with side effects) just to avoid...
Erick Recio
erecio@...
Nov 11, 1998 8:10 pm
23
... Hi everybody. I also found that free(NULL) is allowed by ANSI. But I belive it was included as a special case (with side effects) just to avoid...
Erick Recio
erecio@...
Nov 11, 1998 8:10 pm
24
After playing with dmalloc for a bit, I have a few suggestions: free-blank, check-blank: instead of blanking freed memory, set it to a pattern. alloc-blank:...
Randell Jesup
rjesup@...
Nov 12, 1998 12:32 am
25
I agree with some points made by Randell Jesup. I too would like user-defined patterns used in malloc and free areas. I too like the idea of splitting...
Robert D. Johnson
rjohnson@...
Nov 12, 1998 1:49 am
26
... I do. RTFM. It is set to all 0xc5. http://www.letters.com/dmalloc/texi/dmalloc_3.html#IDX163 ... free-zero and alloc-zero. Good idea. Will do. ... I...
Gray Watson
gray@...
Nov 12, 1998 2:41 pm
27
... How about 0xa110ca7e (allocate) and 0xf4eeda7a (freedata)? :-) -- Alexandre Oliva http://www.dcc.unicamp.br/~oliva aoliva@{acm.org} ...
Alexandre Oliva
oliva@...
Nov 12, 1998 2:41 pm
28
... Irrespective the what standards say, there are still buggy implementations which when confronted by free(0) will attempt to dereference page 0. So, in some...
Scott Michel
scottm@...
Nov 12, 1998 2:41 pm
29
... Cute. I've used patterns like that before - 0xC0DEDBAD, 0xDEADBEEF, 0xC0EDBABE (ok, that was a decade ago). Nowadays I prefer to use cute patterns like...
Randell Jesup
rjesup@...
Nov 12, 1998 7:25 pm
30
ov_seen_c and ov_iteration are int and long respectively. I've been seeing overflows(?) of ov_seen_c: 106944: not freed: '0x769f68|s87' (16 bytes) from...
Randell Jesup
rjesup@...
Nov 12, 1998 9:18 pm
31
... Most likely a dmalloc bug. I've seen them as well but I've never gotten a reproducable case that I can debug. Anyone got one for me? It would need to be...
Gray Watson
gray@...
Nov 12, 1998 10:11 pm
32
... You can't always extract this information. It would be not only platform-dependent; you'd have to rely on undocumented information about each particular...
Alexandre Oliva
oliva@...
Nov 12, 1998 11:45 pm
33
Dear dmalloc users: I'm using a simulation toolkit called Swarm (www.santafe.edu/projects/swarm). It is written in Objective-C. One of my projects had a...
Paul E. Johnson
pauljohn@...
Nov 15, 1998 7:42 pm
34
Version 4.1.0 has been released. http://www.letters.com/dmalloc/ ftp://ftp.letters.com/src/dmalloc/ It contains the new FREED_POINTER_DELAY feature which was...
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