Hello Mike,

On May 29 16:07 96, Mike Bilow of 1:323/107 wrote:

 MB> I can assure you that OS/2 does not even allocate address 
 MB> space when such allocations are requested.  You can watch 
 MB> this inside a device driver, and you see that the segment 
 MB> limits are set to the actual allocated amount in the 
 MB> descriptor table. I have never seen different behavior 
 MB> under any version of OS/2.


PLEASE: 

DosAllocMem(&p1,1,READ/WRITE)
DosAllocMEm(&p2,1,READ/WRITE)

p2-p1 == 64K

2) look at theseue/2, lookt at OS/2 memu ... whatever you want, look into
the new (DevCon9, DevCon10) toolkit docs : OS/2 ALLOCATES 64K address space
AT LEAST on every allocation!

here is a sample program (which also commits the memory) and OS/2 memu and
THESEUE/2 traces (theseus/2 traces the internal memory tables):


==============
#define INCL_DOS
#include 
#include 
#include 

main(int argc, char *argv[], char *envp[])
{
 APIRET rc;
 PVOID  pvBase;

 rc = DosAllocMem(&pvBase, 1, PAG_COMMIT|PAG_READ|PAG_WRITE);
 if( !rc )
   *((PCHAR)pvBase) = '\0';
 printf("%p / rc=%d\n",pvBase,rc);

 rc = DosAllocMem(&pvBase, 1, PAG_COMMIT|PAG_READ|PAG_WRITE);
 if( !rc )
   *((PCHAR)pvBase) = '\0';
 printf("%p / rc=%d\n",pvBase,rc);

 rc = DosAllocMem(&pvBase, 1, PAG_COMMIT|PAG_READ|PAG_WRITE);
 if( !rc )
   *((PCHAR)pvBase) = '\0';
 printf("%p / rc=%d\n",pvBase,rc);

 getch();

 return 0;
}
==============

icc Test.c

E0000 / rc=0
F0000 / rc=0
1C0000 / rc=0

OS20MEMU.EXE: (WARP connect)

Details:             ||
 Linear    Shared    Maximum    In     Swapped     Not     Created
 Address   / Priv.   Size     Memory   / Disc.  Accessed   By
 ÄÄÄÄÄÄÄÄ  ÄÄÄÄÄÄÄ   ÄÄÄÄÄÄÄ  ÄÄÄÄÄÄÄ  ÄÄÄÄÄÄÄ  ÄÄÄÄÄÄÄÄ   ÄÄÄÄÄÄÄ
    e0000  Private        64        4        0         0   TEST
    f0000  Private        64        4        0         0   TEST
   1c0000  Private        64        4        0         0   TEST

WARP FP5 (and prior versions).

THESEUE/2:


Private Object Summary for 'TEST':
  Object Allocated Committed   Present   Swapped
 address    memory    memory    memory    memory  Description
00010000  00010000  00006000  00006000  00000000  TEST  #0001 (shared code)
00020000  00010000  00001000  00001000  00000000  TEST  #0002 (shared code)
00030000  00010000  00001000  00001000  00000000  TEST  #0003 (shared code)
00040000  00010000  00001000  00001000  00000000  TEST  #0004 (shared data)
00050000  00010000  00001000  00000000  00000000  TEST  #0005 (private)
00060000  00010000  00009000  00003000  00000000  TEST  #0006 (private)
00070000  00010000  00002000  00002000  00000000  User Environment (hmte)
00080000  00010000  00001000  00001000  00000000  Thread
                                                   Information Block (hmte)
00090000  00010000  00001000  00001000  00000000  stack (hmte [system owner])
000A0000  00010000  00010000  00004000  00000000  TEST     allocated it
000B0000  00010000  00010000  00001000  00000000  TEST     allocated it
000C0000  00010000  0000F000  00001000  00000000  DOSCALL1 allocated it
000D0000  00010000  00002000  00001000  00000000  TEST     allocated it
>000E0000  00010000  00001000  00001000  00000000  TEST     allocated it
000F0000  00010000  00000000  00000000  00000000  Device Driver 3
                                                    (hmte [system owner])
>00100000  00010000  00001000  00001000  00000000  TEST     allocated it
>00110000  00010000  00001000  00001000  00000000  TEST     allocated it
00120000  03EE0000                                 Free
          --------  --------  --------  --------
Totals:   00110000  0004B000  0001A000  00000000  (in bytes)
              1088       300       104         0  (in Kbytes)
             1.063     0.293     0.102     0.000  (in Mbytes)
Number of objects = 17.

Analysis of 'Free' areas:
There are 1 free blocks which total 03EE0000 (64384K or 62.875M)
The largest 1 free areas are:
 address      size
00120000  03EE0000 (64384K or 62.875M)


WARP GA (OS/2 MEMU)

110000 / rc=0
120000 / rc=0
130000 / rc=0


    --------  -------   -------  -------  -------  --------   -------
      110000  Private        64        4        0         0   TEST
      120000  Private        64        4        0         0   TEST
      130000  Private        64        4        0         0   TEST

 WARPED!, Mario

--- Msgedsq/2 2.2e