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'use strict';
// Checks that setInterval timers keep running even when they're
// unrefed within their callback.
const common = require('../common');
const net = require('net');
let counter1 = 0;
let counter2 = 0;
// Test1 checks that clearInterval works as expected for a timer
// unrefed within its callback: it removes the timer and its callback
// is not called anymore. Note that the only reason why this test is
// robust is that:
// 1. the repeated timer it creates has a delay of 1ms
// 2. when this test is completed, another test starts that creates a
// new repeated timer with the same delay (1ms)
// 3. because of the way timers are implemented in libuv, if two
// repeated timers A and B are created in that order with the same
// delay, it is guaranteed that the first occurrence of timer A
// will fire before the first occurrence of timer B
// 4. as a result, when the timer created by Test2 fired 11 times, if
// the timer created by Test1 hadn't been removed by clearInterval,
// it would have fired 11 more times, and the assertion in the
// process'exit event handler would fail.
function Test1() {
// Server only for maintaining event loop
const server = net.createServer().listen(0);
const timer1 = setInterval(common.mustCall(() => {
timer1.unref();
if (counter1++ === 3) {
clearInterval(timer1);
server.close(() => {
Test2();
});
}
}, 4), 1);
}
// Test2 checks setInterval continues even if it is unrefed within
// timer callback. counter2 continues to be incremented more than 11
// until server close completed.
function Test2() {
// Server only for maintaining event loop
const server = net.createServer().listen(0);
const timer2 = setInterval(() => {
timer2.unref();
if (counter2++ === 3)
server.close();
}, 1);
}
Test1();
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