(combined responses)
> What is true for two stacked layers, maybe false for one.
> (and the other way round).
No standard guarantees that you are only dealing with one layer. In
fact,
in the Windows world, multiple layers (hidden from the programmer) are
common thanks to LSPs. (And yes, a lot of broken Windows code only shows its
breakage with particular LSPs thanks to broken assumptions exactly like this
one.)
> God I hope so...... I'm right in the middle of trying to get this
> non-blocking stuff to work consistently (with a timeline fast
> approaching....arg!) and I can't tell if it's something I am doing wrong
> and what exactly that is. Too many variables to be easy.
If you are trying to use blocking socket operations and be sure you will
not block, you can never be certain that your code will work. If you do not
ask for non-blocking behavior, there is no way for the implementation to
know that you want it.
DS
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