[K/N] Worker API improvements ^KT-52429

Merge-request: KT-MR-6898
Merged-by: Alexander Shabalin <Alexander.Shabalin@jetbrains.com>

kotlin-native/backend.native/tests/runtime/workers/worker_list_workers.kt

@@ -0,0 +1,38 @@
+@file:OptIn(kotlin.ExperimentalStdlibApi::class)
+
+package runtime.workers.worker_list_workers
+
+import kotlin.native.concurrent.*
+import kotlin.test.*
+
+const val WORKER_COUNT = 10
+
+@Test
+fun getAllWorkers() {
+    val workers = Array(WORKER_COUNT) { Worker.start() }
+
+    val expectedWorkers = listOf(Worker.current) + workers
+
+    assertEquals(expectedWorkers.toSet(), Worker.activeWorkers.toSet())
+
+    workers.forEach {
+        it.requestTermination().result
+    }
+}
+
+@Test
+fun getActiveWorkers() {
+    val workers = Array(WORKER_COUNT) { Worker.start() }
+
+    val expectedWorkers = mutableListOf(Worker.current)
+    (0 until WORKER_COUNT step 2).forEach { i ->
+        workers[i].requestTermination().result
+        expectedWorkers.add(workers[i + 1])
+    }
+
+    assertEquals(expectedWorkers.toSet(), Worker.activeWorkers.toSet())
+
+    (0 until WORKER_COUNT step 2).forEach { i ->
+        workers[i + 1].requestTermination().result
+    }
+}