Coroutine(1)

import kotlinx.coroutines.*
import java.lang.Thread.sleep

/*
*
*fun main(){
    GlobalScope.launch {
        println("Hello world!2") //코루틴에서 실행
    }
    println("Hello world!1") //main thread에서 실행
    sleep(1000)
}
* Hello world!1
* Hello world!2
*
*fun main(){
    runBlocking {
        launch { //얌체 - 양보하지 않는다.
            println("Hello world!2") //코루틴에서 실행
        }
    }
    println("Hello world!1") //main thread에서 실행
}
* Hello world!2
* Hello world!1
*
*fun main(){
    val job: Job = CoroutineScope(Dispatchers.Default).launch {
        printTask()
    }
    println(job.isActive)
    println("Hello world!2")
    sleep(1000)
    println(job.isCompleted)
}

suspend fun printTask(){
    println("Hello world!1")
    delay(1000)
}
*
*
* fun main(){
    val str1: Deferred<String> = GlobalScope.async {
        "Hello"
    }

    val str2: Deferred<String> = GlobalScope.async {
        " world!"
    }

    GlobalScope.launch {
        print(str1.await())
        print(str2.await())
    }
    sleep(2000)
}

*
* fun main(){
    GlobalScope.launch {
        doAsyncTask()
    }
    sleep(1000)
}

suspend fun doAsyncTask() = coroutineScope {
    async {
        print("Hello, ")
    }
    async {
        print("world!")
    }
}
*
*
*suspend fun main(){
    val job: Job = GlobalScope.launch {
        println("코루틴 - ${Thread.currentThread().name}")
        println("world!")
    }
    println("메인 - ${Thread.currentThread().name}")
    println("Hello, ")
    job.join() //메인과 이어줄려면 메인도 suspend 처리 해야함.
    job.cancel()
}
*
*
*
* */

fun main(){
    GlobalScope.launch {
        doConcurrentTask()
    }
    sleep(2000)
    println("Main thread ends...")
}

suspend fun doConcurrentTask() = coroutineScope {
    launch{
        println("coroutine-1 starts")
        for (i in 1..5){
            println("working ... $i in cocoroutine-1")
            delay(100)
        }
        println("coroutine-1 ends")
    }
    launch{
        println("coroutine-2 starts")
        for (i in 1..5){
            println("working ... $i in cocoroutine-1")
            delay(120)
        }
        println("coroutine-2 ends")
    }

}