But is it also possible to activate an input buffer which keeps the output without freezing the Perl script?

Much like a Linux terminal does?

Update: Actually, tee nul will work okay of you disable buffering on the output of your script:

perl -le"$|++;print 'x'x80 while do{ 1 for 1..1e7;1}" | tee nul
[download]

That'll allow the script to keep running whilst the console is in a select state, until the pipe fills, and then the script will again stall; but that would be the same on a linux console also I think.

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It already has an associated buffer called the console screen buffer, and you can create as many of these as you like, though only one can be active at any given time.

But these are not 'simple' fifo-like stream buffers, but rather fully random access (by program and user) 2D arrays of characters and attributes. I'm not saying better or worse, just different.

The simple way to provide the isolation you want is to put some other program in charge of the screen, an use a fifo between your script and that other program.

In *nix terms, use a pipe: yourScript.pl | tee nul would probably do it, except now your script has to output 4k before anything shows up on screen at all.

So, running this:

perl -le"$|++;print 'x'x80 while do{ 1 for 1..1e7;1}" | perl -e"$|++; 
+print while <>"
[download]

allows the first script to continue to run flat out, even whilst the second script which has control of the console buffer is blocked in a select state.

(But disabling selection for the duration of the script is easier.)

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