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// SPDX-License-Identifier: GPL-2.0
use kernel::prelude::*;
use kernel::time::{Delta, Instant, Monotonic};
/// Wait until `cond` is true or `timeout` elapsed.
///
/// When `cond` evaluates to `Some`, its return value is returned.
///
/// `Err(ETIMEDOUT)` is returned if `timeout` has been reached without `cond` evaluating to
/// `Some`.
///
/// TODO[DLAY]: replace with `read_poll_timeout` once it is available.
/// (https://lore.kernel.org/lkml/20250220070611.214262-8-fujita.tomonori@gmail.com/)
pub(crate) fn wait_on<R, F: Fn() -> Option<R>>(timeout: Delta, cond: F) -> Result<R> {
let start_time = Instant::<Monotonic>::now();
loop {
if let Some(ret) = cond() {
return Ok(ret);
}
if start_time.elapsed().as_nanos() > timeout.as_nanos() {
return Err(ETIMEDOUT);
}
}
}
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