Hi Norbert,
I couldn't have said it any better. For me, this also was interesting,
because I first thought: "Heck, how would I make anything atomic anyways?".
And that question still stands: is there a way to make something atomic
that includes message sends? I guess #critical is not the solution, is it?
Joachim
Am 14.11.13 11:12, schrieb Norbert Hartl:
Am 14.11.2013 um 10:25 schrieb Marcus Denker <marcus.den...@inria.fr>:
On 14 Nov 2013, at 10:15, Stephan Eggermont <step...@stack.nl> wrote:
Reading this code, made me wonder what operations are actually atomic.
Anyone having a good explanation?
Stephan
AtomicQueueItem>makeCircular
"Make a receiver circular, i.e. point to itself,
answer the old value of next variable.
Note, this operation should be atomic"
| temp |
" atomic swap here"
temp := next.
next := self.
^ temp
-> no message send
-> no back jump bytecode
therefore it can not be interrupted and process switches can not happen between
the statements.
Thanks, I learn something new every day. I’ve never thought about the condition
when a process switch can happen. Can you say in short when a switch of
processes is checked? Because I think I won’t finding it in a reasonable time
looking myself.
Norbert
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