Zig 0.17.0-dev (Split by item)

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eventWait

Same as Io.Event.wait but avoids the VTable.

Threaded.eventWait

fn eventWait(event: *Io.Event) void

File

lib/std/Io/Threaded.zig:18823

Code

fn eventWait(event: *Io.Event) void {
    if (@cmpxchgStrong(Io.Event, event, .unset, .waiting, .acquire, .acquire)) |prev| switch (prev) {
        .unset => unreachable,
        .waiting => {},
        .is_set => return,
    };
    while (true) {
        Thread.futexWaitUncancelable(@ptrCast(event), @backingInt(Io.Event.waiting), null);
        switch (@atomicLoad(Io.Event, event, .acquire)) {
            .unset => unreachable, // `reset` called before pending `wait` returned
            .waiting => continue,
            .is_set => return,
        }
    }
}