On Sep 26, 2011, at 3:40 PM, ext Thiago Macieira wrote:
>
> BTW, if anyone has suggestions on how to write cancellable synchronous code
> that is also non-blocking (co-threads?), I'd love to read some more. Vala
> (the
> language) has some concepts in that area, but I don't know how they're
> implemented.
I've been toying around with a new API for QtConcurrent that supports the
"threaded synchronous" style with cancellation. If using futures it could look
like this:
future f = run([]{
contents = QFile::readAll(fileName);
process(contents);
});
f.cancel() // cancels the task at any point.
QFile:readAll() would register itself with the future and be implemented on top
of a suitable async API that supports cancellation. How does it return from the
readAll() call? By throwing a QCancelledException.
Morten
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