PF> What will happen if two or more threads use the 
PF> same 'FILE *' at the same 
PF> time?

 PE> Presumably what they deserve.


; I know what you mean -- but what about stdout/err/in -- surely
you have to let multiple threads use those; and if they use
global/static/alloc underneath,  those things better be thread safe.


PE> I was using a 7 meg file.

PF> So?

 PE> So you want me to run a 7 meg disk cache with HPFS?  The maximum
 PE> is 2 meg.  Or are you saying that reading from an HPFS disk is
 PE> faster than reading from memory?  I'd like to see that hard
 PE> disk!

Try it -- you might be surprised (I am not saying you WILL be;  I'm not
sure myself -- but I do know that vdisk.sys has "sleep"'s in it
on purpose,  so as not to impact system performance,  or break latency
guidelines).

I once did a test for a non-believer (This was under OS/2 1.3 with hpfs). 
I copied everything necessary to make a program that consisted of a dozen
or so C files.  I copied the compiler, header files, make files --
everything to a ram disk,  then to a hpfs partition.  HPFS beat the pants
off the ramdisk,  even when the HPFS cache was slightly smaller than the
sum of all the files involved.


--- Maximus/2 3.00