Async undefined behavior

[cheatfate]

This simple code shows undefined behavior inside of asyncdispatch.

Conceptually this code must be completed in 1 poll call, but currently it completes for my PC in debug mode in 2108216, 2110094, 2100304 poll calls.

import asyncdispatch

proc task() {.async.} =
  await sleepAsync(1000)

when isMainModule:
  var counter = 0
  var f = task()
  while not f.finished:
    inc(counter)
    poll()

echo counter

[dom96]

Fun :)

[dom96]

I don't think this is undefined behaviour, it depends on how fast the CPU executes these poll's.

This will go away once timers are implemented in the event loop.