Freezing loop

[birbilis]

I see generated code of the following style:

  temp = (function() {
    while (MousePrims.isDown()) {

    }
    world.observer.setGlobal("dragging?", false);
  });
  procs["waitMouseUp"] = temp;
  procs["WAIT-MOUSE-UP"] = temp;

that causes freezing of Firefox

The compiler should never generate such tight (with no code in them) loops I think if Javascript can't handle them. Should have some small sleep in there. In Java even sleep(0) worked to avoid freezing

[birbilis]

Please see this screenshot:

[birbilis]

this correspondes to this code of mine:

to wait-mouse-up
  while [mouse-down?] []
  set dragging? false
end

that works fine in NetLogo Desktop

[birbilis]

I tried adding a "wait 0" in case it would help, but I get back "Error", "unimplemented primitive: wait" message. What other NOP-style command could I use inside that tight loop?

[birbilis]

btw, note that Firefox becomes unresponsive even if one presses Stop Script at the respective dialog. You have to press Debug script, then close the tab

[TheBizzle]

Should have some small sleep in there. In Java even sleep(0) worked to avoid freezing

There is no such thing in JavaScript, which is a single-threaded environment. This problem is the same one that prevents wait from being implemented.

This problem is on our radar and is something that we want to fix soon. However, solving these sorts of problems for NetLogo in a general way, in JavaScript, is not straightforward or easy.

Closing as duplicate of NetLogo/Tortoise#151 .

[birbilis]

Indeed, had discussed this in the past and had forgotten about it. Would expect the whole netlogo program though to run on a background worker