On Thu, Dec 31, 2020 at 6:42 PM Spencer Salazar <spencer.salazar@gmail.com> wrote:

Correct, Std.system does block concurrency. Depending on what you're trying to do there are a few workarounds..

Hi Spencer, thanks for your response

- make any Std.system calls at the beginning of your ChucK script, before audio has started processing

Although it is a good solution, it is not usable in my case, In the actual reasoning I need to grab from R new notes each step of a 16 step sequencer.

- run the R scripts in the background using Std.system -- Std.system more or less directly calls system(3), and it seems as though '&' works, though I havent personally tried this: https://stackoverflow.com/a/5691067

Thats work! adding the ampersand keeps ChucK on time having access to R functions, I will try to explore this solution for now.

In my case:

Blocking : Std.system("Rscript corpus.R > out.log 2> /dev/null");

Non-blocking: Std.system("Rscript corpus.R & > out.log 2> /dev/null");

- use OSC to communicate with a separate long-running script that runs whatever you need

I currently use OSC to fetch the R data at each step, but you make me wonder if there is a better way

best regards,

federico

On Thu, Dec 31, 2020 at 3:33 AM federico lopez <fede2001@gmail.com> wrote:
Hi,
Is the ChucK thread disrupted by the execution time of a Std.system script call?

In the code below, sporking a fast script, e.g. Std.system("sleep 0"), there is no noticeable disruption, but sporking a time consuming version e.g. Std.system("sleep 3") there is a disruption in the other sporks.

I'm trying to call R scripts using ChucK concurrency.

// test code, run with --caution-to-the-wind command-line flag
Noise n => Envelope e => dac;

fun void metro()
{
while(true)
{
e.keyOn();
10::ms => now;
e.keyOff();
990::ms => now;
<<< now, "samples" >>>;
}
}

fun void callSystem()
{
while(true)
{
Std.system("sleep 0"); // comment this to test
//Std.system("sleep 3"); // uncomment this to test
1000::ms => now;
}
}

spork~ metro();
spork~ callSystem();
while(true){10::ms => now;}

// end test code

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