Sleep
On this page
sleep suspends the current coroutine for the given duration. During the pause,
the scheduler can run other tasks — it is cooperative, not blocking.
There are two equivalent forms: the keyword form (sleep 50ms) and the
function form (sleep(pause)). Use the function form when the duration
comes from a variable.
Keyword form and function form; sleep 0ms yields control for one tick without
waiting.
04-sleep.zolo
// Feature: sleep for a duration
// Syntax: two forms — keyword `sleep <dur>` and function `sleep(<dur>)`
// When to use: pause execution of the current coroutine. Cooperative:
// other scheduler tasks may run while you sleep.
print("before")
// Keyword form — direct, no parentheses.
sleep 50ms
print("middle")
// Function form — useful when the duration comes from a variable.
let pause = 30ms
sleep(pause)
print("after")
// expected:
// before
// middle
// after
// Yield to the scheduler with `sleep 0s` — hands over control for one tick.
sleep 0ms
print("one tick later")
// expected: one tick later
// Function form again — useful from a builtin context.
print("before final sleep")
sleep(20ms)
print("after final sleep")
// expected:
// before final sleep
// after final sleep
sleep 0ms is useful for yielding the scheduler — it ensures other
coroutines get a chance to run without introducing any real delay.