- more testing if the runtime is still running

- testing if the promise hoilder is already disposed
- added `exit` to `RuntimeAPI`
- unregister from `FinalizationRegistry` in `upgrade_managed_proxy_to_strong_ref`
- improve `BlazorHosted` WBT exit

src/mono/browser/runtime/cancelable-promise.ts

@@ -36,6 +36,10 @@ export function wrap_as_cancelable<T>(inner: Promise<T>): ControllablePromise<T>
 }
 
 export function mono_wasm_cancel_promise(task_holder_gc_handle: GCHandle): void {
+    if (!loaderHelpers.is_runtime_running()) {
+        mono_log_debug("This promise can't be canceled, mono runtime already exited.");
+        return;
+    }
     const holder = _lookup_js_owned_object(task_holder_gc_handle) as PromiseHolder;
     mono_assert(!!holder, () => `Expected Promise for GCHandle ${task_holder_gc_handle}`);
     holder.cancel();
@@ -75,6 +79,11 @@ export class PromiseHolder extends ManagedObject {
 
     resolve(data: any) {
         mono_assert(!this.isResolved, "resolve could be called only once");
+        mono_assert(!this.isDisposed, "resolve is already disposed.");
+        if (!loaderHelpers.is_runtime_running()) {
+            mono_log_debug("This promise resolution can't be propagated to managed code, mono runtime already exited.");
+            return;
+        }
         if (WasmEnableThreads && !this.setIsResolving()) {
             // we know that cancelation is in flight
             // because we need to keep the GCHandle alive until until the cancelation arrives
@@ -89,11 +98,16 @@ export class PromiseHolder extends ManagedObject {
             return;
         }
         this.isResolved = true;
-        this.complete_task(data, null);
+        this.complete_task_wrapper(data, null);
     }
 
     reject(reason: any) {
         mono_assert(!this.isResolved, "reject could be called only once");
+        mono_assert(!this.isDisposed, "resolve is already disposed.");
+        if (!loaderHelpers.is_runtime_running()) {
+            mono_log_debug("This promise rejection can't be propagated to managed code, mono runtime already exited.");
+            return;
+        }
         const isCancelation = reason && reason[promise_holder_symbol] === this;
         if (WasmEnableThreads && !isCancelation && !this.setIsResolving()) {
             // we know that cancelation is in flight
@@ -109,21 +123,22 @@ export class PromiseHolder extends ManagedObject {
             return;
         }
         this.isResolved = true;
-        this.complete_task(null, reason);
+        this.complete_task_wrapper(null, reason);
     }
 
     cancel() {
         mono_assert(!this.isResolved, "cancel could be called only once");
+        mono_assert(!this.isDisposed, "resolve is already disposed.");
 
         if (this.isPostponed) {
             // there was racing resolve/reject which was postponed, to retain valid GCHandle
             // in this case we just finish the original resolve/reject 
             // and we need to use the postponed data/reason
             this.isResolved = true;
             if (this.reason !== undefined) {
-                this.complete_task(null, this.reason);
+                this.complete_task_wrapper(null, this.reason);
             } else {
-                this.complete_task(this.data, null);
+                this.complete_task_wrapper(this.data, null);
             }
         } else {
             // there is no racing resolve/reject, we can reject/cancel the promise
@@ -138,11 +153,7 @@ export class PromiseHolder extends ManagedObject {
     }
 
     // we can do this just once, because it will be dispose the GCHandle
-    complete_task(data: any, reason: any) {
-        if (!loaderHelpers.is_runtime_running()) {
-            mono_log_debug("This promise can't be propagated to managed code, mono runtime already exited.");
-            return;
-        }
+    complete_task_wrapper(data: any, reason: any) {
         try {
             mono_assert(!this.isPosted, "Promise is already posted to managed.");
             this.isPosted = true;

src/mono/browser/runtime/export-api.ts

@@ -9,11 +9,13 @@ import { getB32, getF32, getF64, getI16, getI32, getI52, getI64Big, getI8, getU1
 import { mono_run_main, mono_run_main_and_exit } from "./run";
 import { mono_wasm_setenv } from "./startup";
 import { loaderHelpers, runtimeHelpers } from "./globals";
+import { mono_exit } from "./loader/exit";
 
 export function export_api(): any {
     const api: APIType = {
         runMain: mono_run_main,
         runMainAndExit: mono_run_main_and_exit,
+        exit: mono_exit,
         setEnvironmentVariable: mono_wasm_setenv,
         getAssemblyExports: mono_wasm_get_assembly_exports,
         setModuleImports: mono_wasm_set_module_imports,

src/mono/browser/runtime/gc-handles.ts

@@ -139,6 +139,9 @@ export function setup_managed_proxy(owner: any, gc_handle: GCHandle): void {
 
 export function upgrade_managed_proxy_to_strong_ref(owner: any, gc_handle: GCHandle): void {
     const sr = create_strong_ref(owner);
+    if (_use_finalization_registry) {
+        _js_owned_object_registry.unregister(owner);
+    }
     _js_owned_object_table.set(gc_handle, sr);
 }
 

src/mono/browser/runtime/invoke-js.ts

@@ -53,6 +53,7 @@ export function mono_wasm_invoke_jsimport(signature: JSFunctionSignature, args:
 
 export function mono_wasm_invoke_jsimport_ST(function_handle: JSFnHandle, args: JSMarshalerArguments): void {
     if (WasmEnableThreads) return;
+    loaderHelpers.assert_runtime_running();
     const bound_fn = js_import_wrapper_by_fn_handle[<any>function_handle];
     mono_assert(bound_fn, () => `Imported function handle expected ${function_handle}`);
     bound_fn(args);
@@ -336,6 +337,7 @@ type BindingClosure = {
 }
 
 export function mono_wasm_invoke_js_function(bound_function_js_handle: JSHandle, args: JSMarshalerArguments): void {
+    loaderHelpers.assert_runtime_running();
     const bound_fn = mono_wasm_get_jsobj_from_js_handle(bound_function_js_handle);
     mono_assert(bound_fn && typeof (bound_fn) === "function" && bound_fn[bound_js_function_symbol], () => `Bound function handle expected ${bound_function_js_handle}`);
     bound_fn(args);

src/mono/browser/runtime/managed-exports.ts

@@ -80,6 +80,7 @@ export function call_entry_point(main_assembly_name: string, program_args: strin
 
 // the marshaled signature is: void LoadSatelliteAssembly(byte[] dll)
 export function load_satellite_assembly(dll: Uint8Array): void {
+    loaderHelpers.assert_runtime_running();
     const sp = Module.stackSave();
     try {
         const size = 3;
@@ -95,6 +96,7 @@ export function load_satellite_assembly(dll: Uint8Array): void {
 
 // the marshaled signature is: void LoadLazyAssembly(byte[] dll, byte[] pdb)
 export function load_lazy_assembly(dll: Uint8Array, pdb: Uint8Array | null): void {
+    loaderHelpers.assert_runtime_running();
     const sp = Module.stackSave();
     try {
         const size = 4;

src/mono/browser/runtime/marshal-to-js.ts

@@ -23,6 +23,7 @@ import { get_marshaler_to_cs_by_type, jsinteropDoc, marshal_exception_to_cs } fr
 import { localHeapViewF64, localHeapViewI32, localHeapViewU8 } from "./memory";
 import { call_delegate } from "./managed-exports";
 import { gc_locked } from "./gc-lock";
+import { mono_log_debug } from "./logging";
 
 export function initialize_marshalers_to_js(): void {
     if (cs_to_js_marshalers.size == 0) {
@@ -337,6 +338,10 @@ function create_task_holder(res_converter?: MarshalerToJs) {
 }
 
 export function mono_wasm_resolve_or_reject_promise(args: JSMarshalerArguments): void {
+    if (!loaderHelpers.is_runtime_running()) {
+        mono_log_debug("This promise resolution/rejection can't be propagated to managed code, mono runtime already exited.");
+        return;
+    }
     const exc = get_arg(args, 0);
     const receiver_should_free = WasmEnableThreads && is_receiver_should_free(args);
     try {

src/mono/browser/runtime/types/index.ts

@@ -415,6 +415,13 @@ export type APIType = {
      * @returns exit code of the Main() method.
      */
     runMainAndExit: (mainAssemblyName?: string, args?: string[]) => Promise<number>;
+    /**
+     * Exits the runtime.
+     * Note: after the runtime exits, it would reject all further calls to the API.
+     * @param code "process" exit code.
+     * @param reason could be a string or an Error object.
+     */
+    exit: (code: number, reason?: any) => void;
     /**
      * Sets the environment variable for the "process"
      * @param name

src/mono/wasm/testassets/BlazorHostedApp/BlazorHosted.Client/Pages/Chat.razor

@@ -86,7 +86,7 @@
     {
         await DisposeHubConnection();
         // exit the client
-        await JSRuntime.InvokeVoidAsync("eval", "import('./dotnet.js').then(module => { module.dotnet; module.exit(0); });");
+        await JSRuntime.InvokeVoidAsync("eval", "getDotnetRuntime(0).exit(0);");
     }
 
     private async Task DisposeHubConnection()