Re: SCO: "thread creation is about a thousand times faster than on

From: Albert D. Cahalan (
Date: Sun Aug 27 2000 - 23:37:06 EST

Victor Yodaiken writes:
> On Sun, Aug 27, 2000 at 08:27:59PM -0700, Linus Torvalds wrote:
>> On Sun, 27 Aug 2000 wrote:

>>> The beauty of POSIX 1003.13 for the RTLinux side is that
>>> we get to define POSIX_SINGLE_PROCESS and forbid forbid
>>> fork and exec: making threads semantics much cleaner.
>> Well, what you think of as a "beauty" I just consider a silly
>> cop-out by the standard. Basically, a lot of things can call
>> themselves "compliant to the letter of the law" wrt POSIX,
>> while still leaving the _user_ out in the cold.
> It's silly to expect to "fork" or to "exec" via a file system
> in a minimal realtime environment. These are complex activities
> however you cut it.

The "exec" is very easy. You don't need a real filesystem.
Your executable names can be a compiled-in table that maps
from string to function pointer.

The "fork" is easy with your choice of position-independent
code, real swapping, x86-style segments, or a real MMU.
You'd use whatever works fastest on the available hardware.
Don't have a COW.
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