Iron Spring Software wrote:
1. Is anyone still reading this NG?
At least one of us.
2. I was curious about OS/2 memory allocation (DosAllocMem), and too
lazy to see if the information I want is in the redbooks, which probably
don't reflect the current status of ArcaOS anyway.
ArcaOS is built on CP2 (Warp 4.52), so an up to date redbook would work. Easier to use ANPM to install the os2tk45 documentation, forget the
exact package name and look at cp1.inf.
At any rate I recalled that each call to DosAlloc allocates 64K (65536)
bytes, and my question was whether or not there was any overhead in the
allocated memory. I write a Q+D program that made two allocations of one
byte each, followed by two allocations of 64K, and in all cases the
addresses of the allocated memory were 64K apart, so no overhead.
Before Warp v3, DosAlloc allocated 4kb blocks. Also not sure if
allocating from high memory (objany) follows the same rule.
From the documentation,
...
Note: DosAllocMem and DosAllocSharedMem both allocate a block of memory
of the size requested rounded up to the nearest page. On OS/2 Warp, the system allocates a 64K object without attributes on every allocation.
For example, for a DosAllocMem call with a size of 1, the system
allocates a 4096-byte block of committed memory plus 61440 bytes without attributes.
...
[probably y'all knew this already]
3. I was going to make a note on the talk page for DosAllocMem page in
the edm2 wiki to help out any other clueless people who might happen
along, but either talk isn't implemented or I need to sign on because I
got a message something like "unable to handle this request" when I
clicked talk.
Do you mean this page, http://www.edm2.com/os2api/Dos/DosAllocMem.html I don't see a talk page, but generally you do need an account to edit edm2
and IIRC, you have to ask Martin to set you up.
There still might be parts not working after the server upgrade as well.
Dave
1. Is anyone still reading this NG?
2. I was curious about OS/2 memory allocation (DosAllocMem), and too
lazy to see if the information I want is in the redbooks, which probably don't reflect the current status of ArcaOS anyway.
At any rate I recalled that each call to DosAlloc allocates 64K (65536) bytes, and my question was whether or not there was any overhead in the allocated memory. I write a Q+D program that made two allocations of one
byte each, followed by two allocations of 64K, and in all cases the
addresses of the allocated memory were 64K apart, so no overhead.
[probably y'all knew this already]
3. I was going to make a note on the talk page for DosAllocMem page in
the edm2 wiki to help out any other clueless people who might happen
along, but either talk isn't implemented or I need to sign on because I
got a message something like "unable to handle this request" when I
clicked talk.
Iron Spring Software schrieb:
1. Is anyone still reading this NG?
Yes. Occasionally.
2. I was curious about OS/2 memory allocation (DosAllocMem), and too
lazy to see if the information I want is in the redbooks, which probably
don't reflect the current status of ArcaOS anyway.
At any rate I recalled that each call to DosAlloc allocates 64K (65536)
bytes, and my question was whether or not there was any overhead in the
allocated memory. I write a Q+D program that made two allocations of one
byte each, followed by two allocations of 64K, and in all cases the
addresses of the allocated memory were 64K apart, so no overhead.
I also remember the 64k block since a long time. But see Daves answer
for details.
[probably y'all knew this already]
3. I was going to make a note on the talk page for DosAllocMem page in
the edm2 wiki to help out any other clueless people who might happen
along, but either talk isn't implemented or I need to sign on because I
got a message something like "unable to handle this request" when I
clicked talk.
Just checked some edm2 pages and the look very different from what I remember. Guess the last server/software migration didn't work well or
is still in progress or no one has time to take care ...
But trac and login there works.
Andi
At any rate I recalled that each call to DosAlloc allocates 64K (65536) bytes,
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