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