Kotlin协程await与join：调度协程优先级及等待线程任务结束

Kotlin协程await与join：调度协程优先级及等待线程任务结束

import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.IO
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
import kotlinx.coroutines.runBlocking

fun main() {
    runBlocking {
        val job = launch(Dispatchers.IO) {
            taskHigh()
        }

        println("->join ${System.currentTimeMillis()}")
        job.join()
        println("join<- ${System.currentTimeMillis()}")

        launch(Dispatchers.IO) {
            taskA()
        }

        launch(Dispatchers.IO) {
            taskB()
        }

        launch(Dispatchers.IO) {
            taskC()
        }
    }
}

suspend fun taskHigh() {
    delay(1000)
    println("high ${System.currentTimeMillis()}")
}

suspend fun taskA() {
    delay(1)
    println("A ${System.currentTimeMillis()}")
}

suspend fun taskB() {
    delay(1)
    println("B ${System.currentTimeMillis()}")
}

suspend fun taskC() {
    delay(1)
    println("C ${System.currentTimeMillis()}")
}

输出：

->join 1762776931685
high 1762776932704
join<- 1762776932705
A 1762776932719
C 1762776932719
B 1762776932719

————————————————————————————————

import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.IO
import kotlinx.coroutines.async
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
import kotlinx.coroutines.runBlocking

fun main() {
    runBlocking {
        val job = async(Dispatchers.IO) {
            taskHigh()
        }

        println("await-> ${System.currentTimeMillis()}")
        job.await()
        println("await<- ${System.currentTimeMillis()}")

        launch(Dispatchers.IO) {
            taskA()
        }

        launch(Dispatchers.IO) {
            taskB()
        }

        launch(Dispatchers.IO) {
            taskC()
        }
    }
}

suspend fun taskHigh() {
    println("->high ${System.currentTimeMillis()}")
    delay(1000)
    println("<-high ${System.currentTimeMillis()}")
}

suspend fun taskA() {
    delay(1)
    println("A ${System.currentTimeMillis()}")
}

suspend fun taskB() {
    delay(1)
    println("B ${System.currentTimeMillis()}")
}

suspend fun taskC() {
    delay(1)
    println("C ${System.currentTimeMillis()}")
}

输出：

await-> 1762777647142
->high 1762777647143
<-high 1762777648152
await<- 1762777648153
A 1762777648167
C 1762777648167
B 1762777648167

相关：

https://blog.youkuaiyun.com/zhangphil/article/details/129265638