Re: C++ fluency

James Kanze <>
Sat, 9 May 2009 05:08:36 -0700 (PDT)
On May 8, 11:15 pm, Ian Collins <> wrote:

James Kanze wrote:

On May 8, 12:05 pm, Ian Collins <> wrote:

I don't know about windows, but most if not all Unix
variants have a real-time scheduling class.

Which does what? (And where do you get it? None of the
Unix variants I know have any classes---their interface is
pure C.)

What do scheduling classes have to do with C?

I understood "class" as the C++ keyword. What do you mean
by it? (I can't find any use of the word in the Posix

OK,I should have said scheduling policy. But I still think
you were being obtuse.

I'm trying to understand what you're saying.

At least on Solaris a real time thread will not be
time-sliced or prempted by anything other than a higher
priority real time thread. So they are ideal for
simulating RTOS behaviour.

Different Unix can (and often will) support different
scheduling policies. I don't quite see how this affects
testability; the question is what happens when thread A
interrupts thread B at any given instant (say because thread
A has a higher priority than thread B).

You wrote "you have absolutely no control over when Windows or
Unix does a context switch" I provided you with an example of
how at least one of those does provide such control.

Except that they don't. They define policies, but they
certainly don't allow you to control exactly when the context
swaps occur.

James Kanze (GABI Software)
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