Cannot use sleep concurrently

[MayamaTakeshi]

Hi,
based on code from #62
I tried to make sleep to run concurrently like this:

var deasync = require('deasync')

setTimeout(function(){
    deasync.sleep(250)
    console.log("deasync works! (1)");
}, 1)

setTimeout(function(){
    deasync.sleep(250)
    console.log("deasync works! (2)");
}, 1)

but the code hangs.
Is this expected?

[ohadcn]

I have similar problem.
have a look at this code:

`const sleep = require('deasync').sleep;

setInterval(e => {
console.log("1", new Date());
}, 1000);
setInterval(e => {
sleep(2000);
console.log("4", new Date());
}, 4000);
`

the code runs and prints:

1 2022-02-17T13:51:31.060Z
1 2022-02-17T13:51:32.062Z
1 2022-02-17T13:51:33.063Z
1 2022-02-17T13:51:36.064Z <-- here the 1 second interval skipped 2 runs
4 2022-02-17T13:51:36.064Z
1 2022-02-17T13:51:37.065Z
1 2022-02-17T13:51:40.062Z <-- skipped again
4 2022-02-17T13:51:40.062Z