Kotlin Standard Library Cookbook

How it works...

The preceding code is going to print the following text to the console:

Running on mainStarting async operation on Thread-0Ending async operation on Thread-0Starting async operation on Thread-1

Ending async operation on Thread-1main thread is free now

We have successfully started two background threads, which are synchronized. In order to run both background threads sequentially, we are using the Thread.join() function, which just blocks the main thread until the background thread completes. In order to instantiate and start a new background thread, we are using the thread() utility function from the kotlin.concurrent package. We are passing it a block of code to be run inside the thread inside a lambda expression.