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DOS4GW problem.

Posted on 1997-05-07
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Last Modified: 2010-04-15
I've got the problem with DOS4GW dos extender for Watcom C.
I would like to make it not to allocate the whole available
extended memory. I need it to spawn another DOS4GW program
from main module.
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Question by:lenin
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icd earned 150 total points
ID: 1250291
I suggest you look at the functions available for TSRs written with DOS4GW since these programs must solve a similar problem.

I can't give you a direct answer since I only have the manual for the 16 bit version.

If this does not help then just reject my answer.
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Expert Comment

by:eljainc
ID: 1250292
I am new to the DOS4GW DOS extender environment, but it seems to me that you
can increase/limit the amount of memory that a program using the extender will use.
This is done by setting by using the DOS4GVM environment variable:

SET DOS4GVM=virtualsize#(memsize)

The "memsize" will be the amount of RAM to limit (in KB)

Thus, if you wanted to limit the amount of memory to 8 Megabytes, you would do something
like:

SET DOS4GVM=virtualsize#8000

Hope this helps
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Expert Comment

by:tdxh
ID: 1250293
If you need it to spawn another DOS4GW program
from main module, you must remember to set the __minreal to
set aside some DOS memory. The __minreal is a public variable,
you can set it as:
    unsigned __near __minreal = 100 * 1024;
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