On Tue, 2004-05-04 at 09:25, Dan Sugalski wrote:Okay, I'm working up the design for the event and IO system so we can get that underway (who, me, avoid the unpleasantness of strings? Nah... :) and I've come across an interesting question.
The way things are going to work with specific actions a program has asked to be done, such as a disk read or write, is that you get back a handle PMC that represents the request, and you can wait on that handle for the request to be completed. The sequence goes something like:
write Px, Py, Sz # Return handle, file, and data to write waitfor Px # Wait for the request to finish
So, all Parrot IO will be asynchronous? Does that mean that there's no way to perform an atomic read or write?
Yes, and there isn't now anywhere anyway so it's not a big deal.
Now, if you mean "will there be no way to just say 'get me some data' or 'send this to a stream'" then, yes, we'll do that. The synchronous version will look like:
writew Px, Sy
(with readw, seekw, tellw, and all that, as needed)
Under the hood it'll be async, though.
--
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Dan Sugalski even samurai
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