1 /*
2  * Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
3  */
4 
5 // This file was automatically generated from shared-mutable-state-and-concurrency.md by Knit tool. Do not edit.
6 package kotlinx.coroutines.guide.exampleSync06
7 
8 import kotlinx.coroutines.*
9 import kotlinx.coroutines.sync.*
10 import kotlin.system.*
11 
massiveRunnull12 suspend fun massiveRun(action: suspend () -> Unit) {
13     val n = 100  // number of coroutines to launch
14     val k = 1000 // times an action is repeated by each coroutine
15     val time = measureTimeMillis {
16         coroutineScope { // scope for coroutines
17             repeat(n) {
18                 launch {
19                     repeat(k) { action() }
20                 }
21             }
22         }
23     }
24     println("Completed ${n * k} actions in $time ms")
25 }
26 
27 val mutex = Mutex()
28 var counter = 0
29 
<lambda>null30 fun main() = runBlocking {
31     withContext(Dispatchers.Default) {
32         massiveRun {
33             // protect each increment with lock
34             mutex.withLock {
35                 counter++
36             }
37         }
38     }
39     println("Counter = $counter")
40 }
41