异步等待闭包中是否需要使用自旋锁？

示例代码：

func someFunction(completion: @escaping () -> Void) { DispatchQueue.global().async { // some long-running task

    DispatchQueue.main.async {
        completion()
    }
}

}

// 异步等待闭包 func someOtherFunction() async { await withCheckedContinuation { continuation in someFunction { // closure 完成时继续 continuation.resume() } } }

// 或者使用自旋锁 func someOtherFunctionUsingSpinLock() { let lock = NSLock() var done = false

someFunction {
    lock.lock()
    defer { lock.unlock() }
    
    done = true
}

while !done {
    lock.lock()
    lock.unlock()
}

}