| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package vsphere |
| 4 | |
| 5 | import ( |
| 6 | "sync" |
| 7 | "time" |
| 8 | ) |
| 9 | |
| 10 | func newTask(doWork func(), doEvery time.Duration) *task { |
| 11 | task := task{ |
| 12 | done: make(chan struct{}), |
| 13 | running: make(chan struct{}), |
| 14 | } |
| 15 | |
| 16 | go func() { |
| 17 | t := time.NewTicker(doEvery) |
| 18 | defer func() { |
| 19 | t.Stop() |
| 20 | close(task.running) |
| 21 | }() |
| 22 | for { |
| 23 | select { |
| 24 | case <-task.done: |
| 25 | return |
| 26 | case <-t.C: |
| 27 | doWork() |
| 28 | } |
| 29 | } |
| 30 | }() |
| 31 | |
| 32 | return &task |
| 33 | } |
| 34 | |
| 35 | type task struct { |
| 36 | once sync.Once |
| 37 | done chan struct{} |
| 38 | running chan struct{} |
| 39 | } |
| 40 | |
| 41 | func (t *task) stop() { |
| 42 | t.once.Do(func() { close(t.done) }) |
| 43 | } |
| 44 | |
| 45 | func (t *task) wait() { |
| 46 | <-t.running |
| 47 | } |
| 48 | |
| 49 | func (t *task) isStopped() bool { |
| 50 | select { |
| 51 | case <-t.done: |
| 52 | return true |
| 53 | default: |
| 54 | return false |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | func (t *task) isRunning() bool { |
| 59 | select { |
| 60 | case <-t.running: |
| 61 | return false |
| 62 | default: |
| 63 | return true |
| 64 | } |
| 65 | } |