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'use strict';
const common = require('../common');
const assert = require('assert');
const child_process = require('child_process');
// Test that workers fail with meaningful error message
// when their initialization fails.
if (common.isWindows) {
common.skip('ulimit does not work on Windows.');
}
// A reasonably low fd count. An empty node process
// creates around 30 fds for its internal purposes,
// so making it too low will crash the process early,
// making it too high will cause too much resource use.
const OPENFILES = 128;
// Double the open files - so that some workers fail for sure.
const WORKERCOUNT = 256;
if (process.argv[2] === 'child') {
const { Worker } = require('worker_threads');
for (let i = 0; i < WORKERCOUNT; ++i) {
const worker = new Worker(
'require(\'worker_threads\').parentPort.postMessage(2 + 2)',
{ eval: true });
worker.on('message', (result) => {
assert.strictEqual(result, 4);
});
// We want to test that if there is an error in a constrained running
// environment, it will be one of `ENFILE`, `EMFILE`, 'ENOENT', or
// `ERR_WORKER_INIT_FAILED`.
const expected = ['ERR_WORKER_INIT_FAILED', 'EMFILE', 'ENFILE', 'ENOENT'];
// `common.mustCall*` cannot be used here as in some environments
// (i.e. single cpu) `ulimit` may not lead to such an error.
worker.on('error', (e) => {
assert.ok(expected.includes(e.code), `${e.code} not expected`);
});
}
} else {
// Limit the number of open files, to force workers to fail.
let testCmd = `ulimit -n ${OPENFILES} && `;
testCmd += `${process.execPath} ${__filename} child`;
const cp = child_process.exec(testCmd);
// Turn on the child streams for debugging purposes.
let stdout = '';
cp.stdout.setEncoding('utf8');
cp.stdout.on('data', (chunk) => {
stdout += chunk;
});
let stderr = '';
cp.stderr.setEncoding('utf8');
cp.stderr.on('data', (chunk) => {
stderr += chunk;
});
cp.on('exit', common.mustCall((code, signal) => {
console.log(`child stdout: ${stdout}\n`);
console.log(`child stderr: ${stderr}\n`);
assert.strictEqual(code, 0);
assert.strictEqual(signal, null);
}));
}
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