[K/N] Add tests on Atomic integers ^KT-49348

kotlin-native/backend.native/tests/build.gradle

@@ -1198,6 +1198,10 @@ standaloneTest("atomic1") {
     source = "runtime/workers/atomic1.kt"
 }
 
+task atomic2(type: KonanLocalTest) {
+    source = "runtime/workers/atomic2.kt"
+}
+
 task lazy0(type: KonanLocalTest) {
     enabled = (project.testTarget != 'wasm32') // Workers need pthreads.
     useGoldenData = true

kotlin-native/backend.native/tests/runtime/workers/atomic2.kt

@@ -0,0 +1,94 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
+import kotlin.test.*
+
+import kotlin.native.concurrent.*
+
+@Test
+fun ctor_Int() {
+    val x = AtomicInt(0)
+    assertEquals(x.value, 0)
+}
+
+@Test
+fun ctor_Long() {
+    val x = AtomicLong(0)
+    assertEquals(x.value, 0)
+}
+
+@Test
+fun setter_Int() {
+    val x = AtomicInt(0)
+    x.value = 1
+    assertEquals(x.value, 1)
+}
+
+@Test
+fun setter_Long() {
+    val x = AtomicLong(0)
+    x.value = 1
+    assertEquals(x.value, 1)
+}
+
+@Test
+fun addAndGet_Int() {
+    val x = AtomicInt(1)
+    val result = x.addAndGet(2)
+    assertEquals(result, 1 + 2)
+    assertEquals(x.value, result)
+}
+
+@Test
+fun addAndGet_Long() {
+    val x = AtomicLong(1)
+    val result = x.addAndGet(2)
+    assertEquals(result, 1 + 2)
+    assertEquals(x.value, result)
+}
+
+@Test
+fun compareAndSwap_Int() {
+    val x = AtomicInt(0)
+    val successValue = x.compareAndSwap(0, 1)
+    assertEquals(successValue, 0)
+    assertEquals(x.value, 1)
+    val failValue = x.compareAndSwap(0, 2)
+    assertEquals(failValue, 1)
+    assertEquals(x.value, 1)
+}
+
+@Test
+fun compareAndSwap_Long() {
+    val x = AtomicLong(0)
+    val successValue = x.compareAndSwap(0, 1)
+    assertEquals(successValue, 0)
+    assertEquals(x.value, 1)
+    val failValue = x.compareAndSwap(0, 2)
+    assertEquals(failValue, 1)
+    assertEquals(x.value, 1)
+}
+
+@Test
+fun compareAndSet_Int() {
+    val x = AtomicInt(0)
+    val successValue = x.compareAndSet(0, 1)
+    assertTrue(successValue)
+    assertEquals(x.value, 1)
+    val failValue = x.compareAndSet(0, 2)
+    assertFalse(failValue)
+    assertEquals(x.value, 1)
+}
+
+@Test
+fun compareAndSet_Long() {
+    val x = AtomicLong(0)
+    val successValue = x.compareAndSet(0, 1)
+    assertTrue(successValue)
+    assertEquals(x.value, 1)
+    val failValue = x.compareAndSet(0, 2)
+    assertFalse(failValue)
+    assertEquals(x.value, 1)
+}