Re: Strange behavior

[Dennis Lee Bieber <wlfraed@ix.netcom.com>]

On Fri, 5 Sep 2014 13:05:05 -0700 (PDT), Laurent <daemon2@internet.lu>
declaimed the following:

>
>No sudden inversion of the order. 
>What has the switching of the tasks to do with this? Shouldn't the delay 0,1 prevent that? That's an eternity for a computer. The New_Line is part of the task? Or is the OS trying to do me a favor by distributing the task on different cores which produces garbage? 
>
	The delay statement provides the OS a known point at which a task
switch CAN (and likely will) take place.

	However, a task switch can take place on ANY operation that hands off
to the OS -- that means any I/O call is a point at which a task switch can
occur. More so with a hyperthreaded/multi-core processor, since a task that
has just invoked an I/O operation is blocked waiting for that I/O to
complete; the other task is free to run at that time (on any core).

	The delay only ensures you get some sort of alternation. Without a
delay, on a single core, and with a fast I/O system, it is possible that
one task could run to completion before the other task even started to run.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/