1// Copyright Joyent, Inc. and other Node contributors.
2//
3// Permission is hereby granted, free of charge, to any person obtaining a
4// copy of this software and associated documentation files (the
5// "Software"), to deal in the Software without restriction, including
6// without limitation the rights to use, copy, modify, merge, publish,
7// distribute, sublicense, and/or sell copies of the Software, and to permit
8// persons to whom the Software is furnished to do so, subject to the
9// following conditions:
10//
11// The above copyright notice and this permission notice shall be included
12// in all copies or substantial portions of the Software.
13//
14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
20// USE OR OTHER DEALINGS IN THE SOFTWARE.
21
22'use strict';
23const common = require('../common');
24const net = require('net');
25
26process.once('beforeExit', common.mustCall(tryImmediate));
27
28function tryImmediate() {
29  setImmediate(common.mustCall(() => {
30    process.once('beforeExit', common.mustCall(tryTimer));
31  }));
32}
33
34function tryTimer() {
35  setTimeout(common.mustCall(() => {
36    process.once('beforeExit', common.mustCall(tryListen));
37  }), 1);
38}
39
40function tryListen() {
41  net.createServer()
42    .listen(0)
43    .on('listening', common.mustCall(function() {
44      this.close();
45      process.once('beforeExit', common.mustCall(tryRepeatedTimer));
46    }));
47}
48
49// Test that a function invoked from the beforeExit handler can use a timer
50// to keep the event loop open, which can use another timer to keep the event
51// loop open, etc.
52//
53// After N times, call function `tryNextTick` to test behaviors of the
54// `process.nextTick`.
55function tryRepeatedTimer() {
56  const N = 5;
57  let n = 0;
58  const repeatedTimer = common.mustCall(function() {
59    if (++n < N)
60      setTimeout(repeatedTimer, 1);
61    else // n == N
62      process.once('beforeExit', common.mustCall(tryNextTickSetImmediate));
63  }, N);
64  setTimeout(repeatedTimer, 1);
65}
66
67// Test if the callback of `process.nextTick` can be invoked.
68function tryNextTickSetImmediate() {
69  process.nextTick(common.mustCall(function() {
70    setImmediate(common.mustCall(() => {
71      process.once('beforeExit', common.mustCall(tryNextTick));
72    }));
73  }));
74}
75
76// Test that `process.nextTick` won't keep the event loop running by itself.
77function tryNextTick() {
78  process.nextTick(common.mustCall(function() {
79    process.once('beforeExit', common.mustNotCall());
80  }));
81}
82