[Onboardc-project] Re: General Memory Management Question

[<ko...@dh...>]

I know why it crashes on exit. It's always because you've overwritten an =
array
bound. Either the OS does something when switching to another program (cl=
eaning
up mem or something I guess), or you are overwritting the stack position =
that
holds where to return to after the program exits.

The different behaviour on different hardware is because the OSes are all
tweaked. The way I see it is if there is a crash on any of them, there is=
 a
potential crash on all of them.

Look for places you interact with allocated memory. Add if(pointer) in fr=
ont of
every statement using mem. Look over your code with a fine toothcomb, or =
chunk
it up and run sections separtely to look for places you might be going ou=
t of
bounds.

I hit this problem a while ago. Threw a wrench in my gears for two good w=
eeks.
Hope it helps you get the VFS thing working :D

-Nick

Original Message:

As this is a general question, I do not expect
anything but a general answer. That said: does anyone
know why a program might work fine on an i705 (OS 4.x)
and the Palm Simulator (OS 5.1), but crash on exit on
a Sony Clie (OS 5.1), Zire 21 (OS 5.2), Zire Simulator
and the new OS 5.4 Simulator, along with the Emulator
for 3.5 and 4.1 ROMs?

Basically, the program allocates Char ** blocks using
MemPtrNew (the code example comes from
OnBoardC_Main.c) and frees it all with MemPtrFree. I
can walk the program through the debugger through to
the very end and not receive an error, but as soon as
the "return 0;" at the end of the program executes,
all of the above die (except for the i705 and Palm Sim
5.1).

So, my general question is: what _kinds_ of things
could I be missing? The code in question is the
prototype of the Add To Project form with VFS support
added, wrapped as an application. I figure that there
is something I missed (obviously -- after all it
crashes!), but it is totally baffling. I open no
databases, do not get or save preferences. I do walk
the databases and look at the database info, but
otherwise I allocate said memory, attach them to
lists, and free said memory.

Hoping for pointers (bad pun intended).

Dale

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