Condition

structsince 0.27.0Source

Fibers waiting until another fiber says that something changed. Unlike channels and locks, wait honours with_deadline. A condition carries no value and remembers nothing: a notify with nobody waiting is lost, so wait in a loop that checks the state itself.

Example

Io :: #import "Extensions/Io";

changed: Io.Condition;
ready: bool;

main :: () {
    Io.io_run(() {
        error: Io.Io_Error;

        // Nothing changes `ready` here, so the wait ends at the deadline.
        Io.with_deadline(20, #code {
            while !ready {
                error = Io.wait(*changed);           // .TIMED_OUT, .CANCELED
                if error != .NONE break;
            }
        });

        assert(error == .TIMED_OUT);
    });
}

Doesn't run in the browser (skipped on wasm).

Fields

waiters: Waiter

Condition

Fields

See also