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// Flags: --experimental-wasm-threads
'use strict';
const common = require('../common');
const assert = require('assert');
const { MessageChannel, Worker } = require('worker_threads');
// Test that SharedArrayBuffer instances created from WASM are transferrable
// through MessageChannels (without crashing).
const fixtures = require('../common/fixtures');
const wasmSource = fixtures.readSync('shared-memory.wasm');
const wasmModule = new WebAssembly.Module(wasmSource);
const instance = new WebAssembly.Instance(wasmModule);
const { buffer } = instance.exports.memory;
assert(buffer instanceof SharedArrayBuffer);
{
const { port1, port2 } = new MessageChannel();
port1.postMessage(buffer);
port2.once('message', common.mustCall((buffer2) => {
// Make sure serialized + deserialized buffer refer to the same memory.
const expected = 'Hello, world!';
const bytes = Buffer.from(buffer).write(expected);
const deserialized = Buffer.from(buffer2).toString('utf8', 0, bytes);
assert.deepStrictEqual(deserialized, expected);
}));
}
{
// Make sure we can free WASM memory originating from a thread that already
// stopped when we exit.
const worker = new Worker(`
const { parentPort } = require('worker_threads');
// Compile the same WASM module from its source bytes.
const wasmSource = new Uint8Array([${wasmSource.join(',')}]);
const wasmModule = new WebAssembly.Module(wasmSource);
const instance = new WebAssembly.Instance(wasmModule);
parentPort.postMessage(instance.exports.memory);
// Do the same thing, except we receive the WASM module via transfer.
parentPort.once('message', ({ wasmModule }) => {
const instance = new WebAssembly.Instance(wasmModule);
parentPort.postMessage(instance.exports.memory);
});
`, { eval: true });
worker.on('message', common.mustCall(({ buffer }) => {
assert(buffer instanceof SharedArrayBuffer);
worker.buf = buffer; // Basically just keep the reference to buffer alive.
}, 2));
worker.once('exit', common.mustCall());
worker.postMessage({ wasmModule });
}
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