Add a switch to destroy runtime only on shutdown (#4482)

kotlin-native/backend.native/tests/interop/migrating_main_thread/lib.kt

@@ -13,4 +13,10 @@ fun writeToA(i: Int) {
     globalA.i = i
 }
 
-fun readFromA() = globalA.i
+fun tryReadFromA(default: Int): Int {
+    return try {
+        globalA.i
+    } catch (e: IncorrectDereferenceException) {
+        default
+    }
+}

kotlin-native/backend.native/tests/interop/migrating_main_thread/main.cpp

@@ -8,17 +8,26 @@
 #include <cassert>
 #include <thread>
 
+constexpr int kInitialValue = 0;
+constexpr int kNewValue = 1;
+constexpr int kErrorValue = 2;
+
 int main() {
     std::thread main1([]() {
-        assert(testlib_symbols()->kotlin.root.readFromA() == 0);
-        testlib_symbols()->kotlin.root.writeToA(1);
-        assert(testlib_symbols()->kotlin.root.readFromA() == 1);
+        assert(testlib_symbols()->kotlin.root.tryReadFromA(kErrorValue) == kInitialValue);
+        testlib_symbols()->kotlin.root.writeToA(kNewValue);
+        assert(testlib_symbols()->kotlin.root.tryReadFromA(kErrorValue) == kNewValue);
     });
     main1.join();
 
     std::thread main2([]() {
+#if defined(IS_LEGACY)
         // Globals were reinitialized.
-        assert(testlib_symbols()->kotlin.root.readFromA() == 0);
+        assert(testlib_symbols()->kotlin.root.tryReadFromA(kErrorValue) == kInitialValue);
+#else
+        // Globals are not accessible.
+        assert(testlib_symbols()->kotlin.root.tryReadFromA(kErrorValue) == kErrorValue);
+#endif
     });
     main2.join();
 

kotlin-native/backend.native/tests/interop/objc/smoke.kt

@@ -10,6 +10,8 @@ import kotlin.native.ref.*
 import kotlin.test.*
 
 fun main(args: Array<String>) {
+    // Test relies on full deinitialization at shutdown.
+    kotlin.native.internal.Debugging.forceCheckedShutdown = true
     autoreleasepool {
         run()
     }