repl,worker: fix crash when SharedArrayBuffer disabled

benchmark/worker/atomics-wait.js

@@ -7,6 +7,10 @@ const bench = common.createBenchmark(main,{
 });
 
 function main({n }){
+ if (typeof SharedArrayBuffer === 'undefined'){
+ throw new Error('SharedArrayBuffers must be enabled to run this benchmark');
+ }
+
  const i32arr = new Int32Array(new SharedArrayBuffer(4));
  bench.start();
  for (let i = 0; i < n; i++)

lib/internal/main/worker_thread.js

@@ -9,7 +9,7 @@ const{
  ArrayPrototypeSplice,
  ObjectDefineProperty,
  PromisePrototypeCatch,
- globalThis:{Atomics },
+ globalThis:{Atomics, SharedArrayBuffer },
 } = primordials;
 
 const{
@@ -142,6 +142,9 @@ port.on('message', (message) =>{
  const originalCwd = process.cwd;
 
  process.cwd = function(){
+ // SharedArrayBuffers can be disabled with --no-harmony-sharedarraybuffer.
+ if (typeof SharedArrayBuffer === 'undefined') return originalCwd();
+
  const currentCounter = Atomics.load(cwdCounter, 0);
  if (currentCounter === lastCounter)
  return cachedCwd;

lib/internal/worker.js

@@ -91,7 +91,8 @@ let cwdCounter;
 
 const environmentData = new SafeMap();
 
-if (isMainThread){
+// SharedArrayBuffers can be disabled with --no-harmony-sharedarraybuffer.
+if (isMainThread && typeof SharedArrayBuffer !== 'undefined'){
  cwdCounter = new Uint32Array(new SharedArrayBuffer(4));
  const originalChdir = process.chdir;
  process.chdir = function(path){

test/parallel/test-worker-no-sab.js

@@ -0,0 +1,17 @@
+// Flags: --no-harmony-sharedarraybuffer
+
+'use strict';
+
+constcommon=require('../common');
+constassert=require('assert');
+const{ isMainThread, Worker }=require('worker_threads');
+
+// Regression test for https://github.com/nodejs/node/issues/39717.
+
+constw=newWorker(__filename);
+
+w.on('exit',common.mustCall((status)=>{
+assert.strictEqual(status,2);
+}));
+
+if(!isMainThread)process.exit(2);