ПУБЛИКАЦИЯ

import kotlin.concurrent.thread

fun main() { 
   //sampleStart 
   class Answer(val value: Int, val computedBy: Thread = Thread.currentThread()) {
    override fun toString() = "Answer: $value, computed by: $computedBy"
}

val answer: Answer by lazy(LazyThreadSafetyMode.PUBLICATION) {
    println("Computing the answer to the Ultimate Question of Life, the Universe, and Everything")
    Answer(42)
}

val t1 = thread(name = "#1") {
    println("Thread 1: $answer")
}

val t2 = thread(name = "#2") {
    println("Thread 2: $answer")
}

// It is **not** guaranteed that 'Computing' message will be printed once,
// but guaranteed that both threads will see 42 computed by *the same* thread as an answer
t1.join()
t2.join() 
   //sampleEnd
}