fix: delay isolate disposal when isolate is in use

NativeScript/runtime/Runtime.mm

@@ -34,6 +34,22 @@
 SimpleAllocator allocator_;
 NSDictionary* AppPackageJson = nil;
 
+void DisposeIsolateWhenPossible(Isolate* isolate) {
+    // most of the time, this will never delay disposal
+    // occasionally this can happen when the runtime is destroyed by actions of its own isolate
+    // as an example: isolate calls exit(0), which in turn destroys the Runtime unique_ptr
+    // another scenario is when embedding nativescript, if the embedder deletes the runtime as a result of a callback from JS
+    // in the case of exit(0), the app will die before actually disposing the isolate, which isn't a problem
+    if (isolate->IsInUse()) {
+        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(10.0 * NSEC_PER_MSEC)),
+                       dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
+            DisposeIsolateWhenPossible(isolate);
+        });
+    } else {
+        isolate->Dispose();
+    }
+}
+
 void Runtime::Initialize() {
     MetaFile::setInstance(RuntimeConfig.MetadataPtr);
 }
@@ -82,7 +98,7 @@
         this->isolate_->SetData(Constants::RUNTIME_SLOT, nullptr);
     }
 
-    this->isolate_->Dispose();
+    DisposeIsolateWhenPossible(this->isolate_);
 
     currentRuntime_ = nullptr;
 }