atomis: add notify alias

PR-URL: https://github.com/nodejs/node/pull/21413
Refs: https://github.com/nodejs/node/issues/21219
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

3 files changed, 34 insertions, 2 deletions

diff --git a/.eslintrc.js b/.eslintrc.js
index dc83c0e8c1..a779517907 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -243,6 +243,7 @@ module.exports = {
     'node-core/no-unescaped-regexp-dot': 'error',
   },
   globals: {
+    Atomics: false,
     BigInt: false,
     BigInt64Array: false,
     BigUint64Array: false,
diff --git a/src/node.cc b/src/node.cc
index 292307e9da..6cf5f2ad84 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -3478,16 +3478,37 @@ Local<Context> NewContext(Isolate* isolate,
   auto context = Context::New(isolate, nullptr, object_template);
   if (context.IsEmpty()) return context;
   HandleScope handle_scope(isolate);
-  auto intl_key = FIXED_ONE_BYTE_STRING(isolate, "Intl");
-  auto break_iter_key = FIXED_ONE_BYTE_STRING(isolate, "v8BreakIterator");
   context->SetEmbedderData(
       ContextEmbedderIndex::kAllowWasmCodeGeneration, True(isolate));
+
+  auto intl_key = FIXED_ONE_BYTE_STRING(isolate, "Intl");
+  auto break_iter_key = FIXED_ONE_BYTE_STRING(isolate, "v8BreakIterator");
   Local<Value> intl_v;
   if (context->Global()->Get(context, intl_key).ToLocal(&intl_v) &&
       intl_v->IsObject()) {
     Local<Object> intl = intl_v.As<Object>();
     intl->Delete(context, break_iter_key).FromJust();
   }
+
+  // https://github.com/nodejs/node/issues/21219
+  // TODO(devsnek): remove when v8 supports Atomics.notify
+  auto atomics_key = FIXED_ONE_BYTE_STRING(isolate, "Atomics");
+  Local<Value> atomics_v;
+  if (context->Global()->Get(context, atomics_key).ToLocal(&atomics_v) &&
+      atomics_v->IsObject()) {
+    Local<Object> atomics = atomics_v.As<Object>();
+    auto wake_key = FIXED_ONE_BYTE_STRING(isolate, "wake");
+
+    Local<Value> wake = atomics->Get(context, wake_key).ToLocalChecked();
+    auto notify_key = FIXED_ONE_BYTE_STRING(isolate, "notify");
+
+    v8::PropertyDescriptor desc(wake, true);
+    desc.set_enumerable(false);
+    desc.set_configurable(true);
+
+    atomics->DefineProperty(context, notify_key, desc).ToChecked();
+  }
+
   return context;
 }
 
diff --git a/test/parallel/test-atomics-notify.js b/test/parallel/test-atomics-notify.js
new file mode 100644
index 0000000000..dcca7a9fd1
--- /dev/null
+++ b/test/parallel/test-atomics-notify.js
@@ -0,0 +1,10 @@
+'use strict';
+
+require('../common');
+
+const assert = require('assert');
+const { runInNewContext } = require('vm');
+
+assert.strictEqual(Atomics.wake, Atomics.notify);
+
+assert(runInNewContext('Atomics.wake === Atomics.notify'));