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'use strict';
const common = require('../common');
const assert = require('assert');
const { MessageChannel } = require('worker_threads');
// This tests various behaviors around transferring MessagePorts with closing
// or closed handles.
const { port1, port2 } = new MessageChannel();
const arrayBuf = new ArrayBuffer(10);
port1.onmessage = common.mustNotCall();
port2.onmessage = common.mustNotCall();
function testSingle(closedPort, potentiallyOpenPort) {
assert.throws(common.mustCall(() => {
potentiallyOpenPort.postMessage(null, [arrayBuf, closedPort]);
}), common.mustCall((err) => {
assert.strictEqual(err.name, 'DataCloneError');
assert.strictEqual(err.message,
'MessagePort in transfer list is already detached');
assert.strictEqual(err.code, 25);
assert.ok(err instanceof Error);
const DOMException = err.constructor;
assert.ok(err instanceof DOMException);
assert.strictEqual(DOMException.name, 'DOMException');
return true;
}));
// arrayBuf must not be transferred, even though it is present earlier in the
// transfer list than the closedPort.
assert.strictEqual(arrayBuf.byteLength, 10);
}
function testBothClosed() {
testSingle(port1, port2);
testSingle(port2, port1);
}
// Even though the port handles may not be completely closed in C++ land, the
// observable behavior must be that the closing/detachment is synchronous and
// instant.
port1.close(common.mustCall(testBothClosed));
testSingle(port1, port2);
port2.close(common.mustCall(testBothClosed));
testBothClosed();
function tickUnref(n, fn) {
if (n === 0) return fn();
setImmediate(tickUnref, n - 1, fn).unref();
}
tickUnref(10, common.mustNotCall('The communication channel is still open'));
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