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STEP1_Basics/8_Threads/main.kt

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+package org.example
+
+var sum: Int = 0
+var lock: Int = -1
+var workers: Array<Int> = arrayOf()
+
+class WorkerThread(private val threadI: Int): Thread() {
+    public override fun run() {
+        for (i in 1..3) {
+            // Wait until unlocked
+            while (lock != threadI) {
+                Thread.sleep(100)
+            }
+            sum += 1
+            println("T$threadI | $sum")
+            Thread.sleep(500)
+            // Pass execution to the next thread
+            // Check if we not last
+            if (workers.size > 1) {
+                // Check if thread last in array
+                if (workers.indexOf(threadI) == (workers.size - 1)) {
+                    lock = 0
+                }
+                else {
+                    lock = workers.indexOf(threadI) + 1
+                }
+            }
+        }
+    }
+}
+
+fun main() {
+    val threadNums = 3;
+
+    var threadArray: Array<Thread> = arrayOf()
+    var firstThread: Boolean = true
+    for (i in 0..<threadNums) {
+        if (firstThread) {
+            lock = i
+            firstThread = false
+        }
+        threadArray += WorkerThread(i)
+        workers += i
+    }
+    for (i in threadArray) {
+        i.start()
+    }
+}