std.concurrent

Concurrency helper module.

use std.concurrent

This module depends on operating system threads and is not exported on the wasm32 target.

Function List

Function	Signature
sleep	(millis: Int) -> Void
thread_id	() -> String
yield_now	() -> Void

Functions

sleep

sleep: (millis: Int) -> Void

Blocks the current thread for the specified number of milliseconds.

• millis —— number of milliseconds to sleep; if not an Int or missing, treated as 0 (no error)

Unit note: std.time.sleep takes seconds and accepts decimals, while this function takes milliseconds. concurrent.sleep(1) sleeps for 1 millisecond, and time.sleep(1) sleeps for 1 second.

use std.concurrent

main: () -> Void = {
    concurrent.sleep(0)
    concurrent.sleep(1)
}

thread_id

thread_id: () -> String

Returns the identifier string of the current thread.

Returns: a string like ThreadId(1). The specific value varies by platform and scheduling; you should only check for its existence, not rely on its specific content or format.

use std.assert
use std.concurrent
use std.string

main: () -> Void = {
    tid = concurrent.thread_id()
    assert(string.len(tid) > 0)
}

yield_now

yield_now: () -> Void

Actively yields the current thread's scheduling time slice, giving other threads a chance to run.

use std.concurrent

main: () -> Void = {
    concurrent.yield_now()
}

Related

• std.time.sleep —— second-level sleep
• Language Spec: Concurrency Model —— spawn and spawn semantics