Question

根据Kotlin文档，CoroutineScope不会阻塞当前线程。他们显示了以下代码示例：

fun main() = runBlocking { // this: CoroutineScope
    launch { 
        delay(200L)
        println("Task from runBlocking")
    }

    coroutineScope { // Creates a coroutine scope
        launch {
            delay(500L) 
            println("Task from nested launch")
        }

        delay(100L)
        println("Task from coroutine scope") // This line will be printed before the nested launch
    }

    println("Coroutine scope is over") // This line is not printed until the nested launch completes
}

输出如下：

Task from coroutine scope
Task from runBlocking
Task from nested launch
Coroutine scope is over

它们甚至包括评论：

直到嵌套启动完成后才打印此行

当然，该行直到结束才显示。但这是我不明白的。他们说CoroutineScope不会阻塞当前线程。那么，为什么在第一次启动完成后不打印此行？

println("Coroutine scope is over")

此行不属于coroutineScope。我期望结果是：

Coroutine scope is over
Task from runBlocking
Task from coroutine scope
Task from nested launch

CoroutineScope阻止当前线程

0 个答案: