jvmTest.guide.example-cancel-09.kt Maven / Gradle / Ivy

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Coroutines support libraries for Kotlin

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/*
 * Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 */

// This file was automatically generated from cancellation-and-timeouts.md by Knit tool. Do not edit.
package kotlinx.coroutines.guide.exampleCancel09

import kotlinx.coroutines.*

var acquired = 0

class Resource {
    init { acquired++ } // Acquire the resource
    fun close() { acquired-- } // Release the resource
}

fun main() {
    runBlocking {
        repeat(100_000) { // Launch 100K coroutines
            launch { 
                var resource: Resource? = null // Not acquired yet
                try {
                    withTimeout(60) { // Timeout of 60 ms
                        delay(50) // Delay for 50 ms
                        resource = Resource() // Store a resource to the variable if acquired      
                    }
                    // We can do something else with the resource here
                } finally {  
                    resource?.close() // Release the resource if it was acquired
                }
            }
        }
    }
    // Outside of runBlocking all coroutines have completed
    println(acquired) // Print the number of resources still acquired
}