Re: [Vala] volatile variable

[Nor Jaidi Tuah <norjaidi tuah ubd edu bn>]

Summary: byte access (read/write) is atomic on
MOST architectures. Dang! I thought ALL.

> [1] Synchronized means if x and y are set to 0 and thread 1 sets first x
> and then y to 1 then thread 2 might read y == 1 and then x == 0. Atomic
> means that state of x and y are either 0 or 1. Note that x86 is rather
> strongly order architecture so you won't notice it in _most_
> circumstances on that platform but you can get the reordering on for
> example  arm. Programmers manual from processors should have a few pages
> in them stating the exact rules.

Don't forget the compiler. It too can reorder.


Nice day
Nor Jaidi Tuah





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