//! Time and sleeping.

use core::time::Duration;

use crate::sys;

/// Milliseconds since boot (monotonic).
pub fn uptime_ms() -> u64 {
    unsafe { sys::syscall0(sys::SYS_GETMILLISECONDS) as u64 }
}

/// Sleep for at least `d`, rounded up to the 1 ms scheduler tick.
pub fn sleep(d: Duration) {
    let ms = d.as_millis().min(u64::MAX as u128) as u64 + u64::from(d.subsec_nanos() % 1_000_000 != 0);
    if ms > 0 {
        unsafe { sys::syscall1(sys::SYS_SLEEP_MS, ms) };
    }
}