Method cancel

Libraries/Await/Await.cpp:672–701

}

Result AwaitTask::cancel(AwaitEventLoop& await)
{
    if (not handle)
    {
        return Result::Error("AwaitTask is invalid");
    }
    Promise& promise = handle.promise();
    if (promise.completed)
    {
        return Result(true);
    }
    if (promise.eventLoop != nullptr and promise.eventLoop != &await)
    {
        return AwaitWrongEventLoopResult();
    }
    if (not promise.started)
    {
        return Result::Error("AwaitTask is not started");
    }
    if (promise.cancellationRequested)
    {
        return Result(true);
    }
    if (promise.cancellation.cancel == nullptr)
    {
        return Result::Error("AwaitTask cannot be cancelled right now");
    }
    promise.cancellationRequested = true;
    return promise.cancellation.cancel(promise.cancellation.object, await);
}

bool AwaitTask::await_ready() const { return not isActive(); }