How preemption works

[Ddystopia]

Hello, I want to run https://rtic.rs in wasm and I need some way to have interrupts or preemption in general. You've solved that problem to make operation system's, can you then advice me on that please?

[copy]

v86 is polling for browser events, basically:

while(true)
{
  let start = Date.now();
  while(Date.now() - start < 1)
  {
    run_some_instructions();
  }

  // allow keyboard/mouse/etc. events to be called
  // see https://github.com/copy/v86/blob/51bf5a63dcc34f806cdc3c182c383d770e76e0cf/src/main.js#L141
  yield_to_browser();
}

A better implementation could run the cpu work in a worker and communicate with SharedArrayBuffers, but v86 currently does not use that.

[Ddystopia]

Thanks for response! Can you please link to the equivalent to run_some_instructions? Thanks!

[copy]

v86/src/rust/cpu/cpu.rs

Line 3146 in 51bf5a6

pub unsafe fn do_many_cycles_native() {