multithreading - 如何在 Swift 中创建 volatile bool 值？

Question

我想在后台执行一些任务并添加取消任务的能力。

类似于:

while !isCanceled && someOtherCondition() {
    doSome()
}

并从另一个线程取消任务:

func cancel() {
    isCanceled = true
}

在 Java 中，我可以声明 isCancelled volatile，这就足够了。我如何在 Swift 中执行此操作？

Answer 1

似乎这是你的答案:

Swift does not (yet) have a well-defined memory model, so there’s no direct equivalent of C’s volatile. Having said that, C didn’t have a well-defined memory model until C11 either, so you can go a long way without one.

https://forums.developer.apple.com/thread/46256