Fix unchecked runtime shutdown (#4575)

kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/checked.kt

@@ -0,0 +1,23 @@
+import leakMemory.*
+import kotlin.native.concurrent.*
+import kotlin.test.*
+import kotlinx.cinterop.*
+
+val global = AtomicInt(0)
+
+fun ensureInititalized() {
+    kotlin.native.initRuntimeIfNeeded()
+    // Leak memory
+    StableRef.create(Any())
+    global.value = 1
+}
+
+fun main() {
+    kotlin.native.internal.Debugging.forceCheckedShutdown = true
+    assertTrue(global.value == 0)
+    // Created a thread, made sure Kotlin is initialized there.
+    test_RunInNewThread(staticCFunction(::ensureInititalized))
+    assertTrue(global.value == 1)
+    // Now exiting. With checked shutdown we will fail, complaining there're
+    // unfinished threads with runtimes.
+}

kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/leakMemory.cpp

@@ -0,0 +1,15 @@
+#include "leakMemory.h"
+
+#include <atomic>
+#include <thread>
+
+extern "C" void test_RunInNewThread(void (*f)()) {
+    std::atomic<bool> haveRun(false);
+    std::thread t([f, &haveRun]() {
+        f();
+        haveRun = true;
+        while (true) {}
+    });
+    t.detach();
+    while (!haveRun) {}
+}

kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/leakMemory.def

@@ -0,0 +1,5 @@
+package leakMemory
+
+---
+
+void test_RunInNewThread(void (*)());

kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/leakMemory.h

@@ -0,0 +1,9 @@
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void test_RunInNewThread(void (*)());
+
+#ifdef __cplusplus
+}
+#endif

kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/unchecked.kt

@@ -0,0 +1,23 @@
+import leakMemory.*
+import kotlin.native.concurrent.*
+import kotlin.test.*
+import kotlinx.cinterop.*
+
+val global = AtomicInt(0)
+
+fun ensureInititalized() {
+    kotlin.native.initRuntimeIfNeeded()
+    // Leak memory
+    StableRef.create(Any())
+    global.value = 1
+}
+
+fun main() {
+    kotlin.native.internal.Debugging.forceCheckedShutdown = false
+    assertTrue(global.value == 0)
+    // Created a thread, made sure Kotlin is initialized there.
+    test_RunInNewThread(staticCFunction(::ensureInititalized))
+    assertTrue(global.value == 1)
+    // Now exiting. With unchecked shutdown, we exit quietly, even though there're
+    // unfinished threads with runtimes.
+}