kotlin协程，runBlocking里面的launch

朴灿烈づ我的快乐病毒、 2023-10-12 21:08 12阅读 0赞

import kotlinx.coroutines.*
    import kotlin.system.measureTimeMillis
    
    fun main(args: Array<String>) {
        println("start")
        val time = measureTimeMillis {
            runBlocking {
                println("1")
    
                launch {
                    println("->a")
                    delay(2000)
                    println("a")
                }
    
                launch {
                    println("->b")
                    delay(1500)
                    println("b")
                }
    
                println("2")
            }
        }
    
        println("time=$time")
    }

> start  
> 1  
> 2  
> \->a  
> \->b  
> b  
> a  
> time=2071

[kotlin协程runBlocking 阻塞线程\_zhangphil的博客-CSDN博客runBlocking 内部启动的3个协程做耗时操作，从输出可以看到3个协程交叉并发执行，runBlocking 会等到3个协程执行结束后才退出，输出结果有明确先后顺序。runBlocking 会等待相同作用域的协程完成才退出runBlocking 本身阻塞线程，但内部运行的协程又非阻塞。kotlin的runBlocking 当内部相同作用域的所有协程都运行结束后，在 runBlocking 之后的代码才能执行， runBlocking 会阻塞所在线程。![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/129263455][kotlin_runBlocking _zhangphil_-CSDN_runBlocking _3_3_runBlocking _3_runBlocking _runBlocking _kotlin_runBlocking _ runBlocking _ runBlocking _favicon32.ico_https_blog.csdn.net_zhangphil_article_details_129263455]

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