fix(napi): Fix worker threads importing already-loaded NAPI addon (#25245)

Part of #20613.

If a node addon is using the legacy `napi_module_register` on ctor
approach to module registration, we have to store the registered module
so that other threads can load the addon (because `napi_module_register`
will only be called once per process).

1 files changed, 35 insertions, 0 deletions

diff --git a/tests/napi/init_test.js b/tests/napi/init_test.js
index 9db99d8a0..948682478 100644
--- a/tests/napi/init_test.js
+++ b/tests/napi/init_test.js
@@ -2,6 +2,7 @@
 
 import { Buffer } from "node:buffer";
 import { assert, libSuffix } from "./common.js";
+import { Worker } from "node:worker_threads";
 
 const ops = Deno[Deno.internal].core.ops;
 
@@ -13,3 +14,37 @@ Deno.test("ctr initialization (napi_module_register)", {
   assert(obj != null);
   assert(typeof obj === "object");
 });
+
+Deno.test("ctr initialization by multiple threads (napi_module_register)", {
+  ignore: Deno.build.os == "windows",
+}, async function () {
+  const path = new URL(`./module.${libSuffix}`, import.meta.url).pathname;
+  const obj = ops.op_napi_open(path, {}, Buffer, reportError);
+  const common = import.meta.resolve("./common.js");
+  assert(obj != null);
+  assert(typeof obj === "object");
+
+  const worker = new Worker(
+    `
+    import { Buffer } from "node:buffer";
+    import { parentPort } from "node:worker_threads";
+    import { assert } from "${common}";
+    
+    const ops = Deno[Deno.internal].core.ops;
+    const obj = ops.op_napi_open("${path}", {}, Buffer, reportError);
+    assert(obj != null);
+    assert(typeof obj === "object");
+    parentPort.postMessage("ok");
+    `,
+    {
+      eval: true,
+    },
+  );
+
+  const p = Promise.withResolvers();
+  worker.on("message", (_m) => {
+    p.resolve();
+  });
+
+  await p.promise;
+});