Data commit

Task/Synchronous-concurrency/Kotlin/synchronous-concurrency-1.kotlin

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+import java.util.concurrent.SynchronousQueue
+import kotlin.concurrent.thread
+import java.io.File
+
+const val EOT = "\u0004"  // end of transmission
+
+fun main(args: Array<String>) {
+    val queue = SynchronousQueue<String>()
+
+    val work = thread {
+        var count = 0
+
+        while (true) {
+             val line = queue.take()
+             if (line == EOT) {
+                queue.put(count.toString())
+                break
+             }
+             println(line)
+             count++
+        }
+    }
+
+    File("input.txt").forEachLine { line -> queue.put(line) }
+    queue.put(EOT)
+    work.join()
+
+    val count = queue.take().toInt()
+    println("\nNumber of lines printed = $count")
+}

Task/Synchronous-concurrency/Kotlin/synchronous-concurrency-2.kotlin

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+// version 1.3.20 with kotlinx-coroutines-core version 1.1.1
+
+import kotlinx.coroutines.async
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.channels.sumBy
+import kotlinx.coroutines.coroutineScope
+import java.io.File
+
+suspend fun main() {
+    coroutineScope {
+        val lines = Channel<String>()
+
+        val count = async {
+            lines.sumBy { line ->
+                println(line)
+                1
+            }
+        }
+
+        File("input.txt").bufferedReader().forEachLine { line -> lines.send(line) }
+        println("\nNumber of lines printed = ${count.await()}")
+    }
+}