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34 lines
1.1 KiB
34 lines
1.1 KiB
8 years ago
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'use strict';
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require('../common');
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const vm = require('vm');
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// We're testing a race condition so we just have to spin this in a loop
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// for a little while and see if it breaks. The condition being tested
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// is an `isolate->TerminateExecution()` reaching the main JS stack from
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// the timeout watchdog.
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const sandbox = { timeout: 5 };
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const context = vm.createContext(sandbox);
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const script = new vm.Script(
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'var d = Date.now() + timeout;while (d > Date.now());'
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);
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const immediate = setImmediate(function() {
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throw new Error('Detected vm race condition!');
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});
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// When this condition was first discovered this test would fail in 50ms
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// or so. A better, but still incorrect implementation would fail after
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// 100 seconds or so. If you're messing with vm timeouts you might
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// consider increasing this timeout to hammer out races.
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const giveUp = Date.now() + 5000;
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do {
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// The loop adjusts the timeout up or down trying to hit the race
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try {
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script.runInContext(context, { timeout: 5 });
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++sandbox.timeout;
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} catch (err) {
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--sandbox.timeout;
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}
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} while (Date.now() < giveUp);
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clearImmediate(immediate);
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