worker: fix exit code for error thrown in handler

Change worker exit code when the unhandled exception
handler throws from 0 to 7

fixes: nodejs#37996

lib/internal/main/worker_thread.js

@@ -199,17 +199,29 @@ port.on('message', (message) => {
 function workerOnGlobalUncaughtException(error, fromPromise) {
   debug(`[${threadId}] gets uncaught exception`);
   let handled = false;
+  let handlerThrew = false;
   try {
     handled = onGlobalUncaughtException(error, fromPromise);
   } catch (e) {
     error = e;
+    handlerThrew = true;
   }
   debug(`[${threadId}] uncaught exception handled = ${handled}`);
 
   if (handled) {
     return true;
   }
 
+  if (!process._exiting) {
+    try {
+      process._exiting = true;
+      process.exitCode = handlerThrew ? 7 : 1;
+      if (!handlerThrew) {
+        process.emit('exit', process.exitCode);
+      }
+    } catch {}
+  }
+
   let serialized;
   try {
     const { serializeError } = require('internal/error_serdes');

test/fixtures/process-exit-code-cases.js

@@ -111,3 +111,15 @@ cases.push({
   result: 0,
   error: /^Error: ok$/,
 });
+
+function exitWithThrowInUncaughtHandler() {
+  process.on('uncaughtException', () => {
+    throw new Error('ok')
+  });
+  throw new Error('bad');
+}
+cases.push({
+  func: exitWithThrowInUncaughtHandler,
+  result: 7,
+  error: /^Error: ok$/,
+});