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 Post subject: Synchronous file operation?
Unread postPosted: Wed Oct 19, 2016 2:08 am 
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Joined: Sat May 14, 2011 7:43 am
Posts: 353
Location: South Africa, UK & US (Florida)
I didn't know whether to put this in 'questions' or 'enhancements', as perhaps it is already possible? But I can't find out how.
Let us suppose that a BASIC! program is running in a tight (graphics?) loop and encounters a condition that requires a file operation (perhaps a graburl?).
Currently the program is suspended until the file operation completes or times-out.
It would be very valuable if, instead, the program could resume its loop whilst testing a 'flag' which would be set when the file operation either completed or timed-out.
I know this is asking a lot from a single-threading interpreter, but it WOULD be nice!
Any ideas or prospect?
Peter


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 Post subject: Re: Synchronous file operation?
Unread postPosted: Wed Oct 19, 2016 2:57 am 
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Joined: Tue Jan 03, 2012 9:31 am
Posts: 5447
Location: Paris, France
Hi Peter,

I suppose you want to continue refreshing the UI while downloading something in the background ?
This would require multi-threading, yes, so not natively supported by BASIC!

...at last not graphic mode, but in fact you can do it in HTML mode !
(I do it in the Compiler, when dexifying for example).

You can launch a javascript code to do some UI operations for a certain time (or until you send an 'end' message to the WebView) and in the meantime run your BASIC! commands...

If your whole program is in graphic mode, maybe you can just switch to HTML only the time of doing this multi-thread operation, then resume the GR mode ?

Nicolas

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- Creator of the Android BASIC! Compiler


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