[SDL] [OT] Resource file

[Mason Wheeler]

This may be a bit of a n00b question, but when I looked up "mmapping", all the information I found seemed to indicate that it's just a UNIX/Linux thing.  Will this be cross-platform?

----- Original Message ----
From: Andre de Leiradella <leiradella at bigfoot.com>
To: sdl at lists.libsdl.org
Sent: Thursday, February 21, 2008 9:13:46 AM
Subject: Re: [SDL] [OT] Resource file



> 
[...]
>  
 
>> 
But 
only 
pages 
actually 
accessed 
by 
the 
application 
are 
actually
>> 
brought 
to 
RAM 
by 
the 
OS, 
right? 
Moreover, 
the 
OS 
will 
swap 
out
>> 
pages 
to 
disk 
if 
the 
application 
needs 
physical 
RAM, 
won't 
it?
>>  
  
 
> 
[...]
>
> 
Yes, 
but 
physical 
memory 
isn't 
the 
problem. 
The 
application's 
address 
> 
space 
is. 
All 
you 
have 
is 
4 
GiB 
of 
address 
space, 
some 
of 
which 
is 
> 
already 
reserved 
by 
the 
system 
(usually 
1-2 
GiB, 
depending 
on 
OS), 
> 
and 
the 
remaining 
2-3 
GiB 
is 
all 
you 
have 
left 
for 
addressing 
memory, 
> 
VRAM, 
memory 
mapped 
files 
and 
whatnot.
>
> 
Thus, 
in 
a 
32 
bit 
environment, 
you 
need 
to 
"bank 
switch" 
large 
files; 
> 
ie 
map 
only 
part 
of 
the 
file 
at 
a 
time.
>  
 
So 
it 
means 
I 
have 
to 
mmap 
only 
pieces 
of 
the 
file 
when 
af_entry_open 
is 
called...

Thanks 
for 
the 
info.

Cheers,

Andre
>
> 
//David 
Olofson 
- 
Programmer, 
Composer, 
Open 
Source 
Advocate
>
> 
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- 
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>  
 

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