/
exit.go
58 lines (48 loc) · 1.07 KB
/
exit.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
/*
Copyright (C) 2013 Aaron Lindsay <aaron@aclindsay.com>
*/
package asink
import (
"os"
"os/signal"
"sync/atomic"
)
var exitWaiterCount int32
var exitCalled chan int
var exitWaiterChan chan int
func init() {
exitWaiterCount = 0
exitWaiterChan = make(chan int)
exitCalled = make(chan int)
}
func SetupCleanExitOnSignals() {
go setupCleanExitOnSignals()
}
func setupCleanExitOnSignals() {
//wait to properly close the socket when we're exiting
exitCode := 0
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt)
defer signal.Stop(sig)
select {
case <-sig:
case exitCode = <-exitCalled:
}
for c := atomic.AddInt32(&exitWaiterCount, -1); c >= 0; c = atomic.AddInt32(&exitWaiterCount, -1) {
exitWaiterChan <- exitCode
}
}
func Exit(exitCode int) {
exitCalled <- exitCode
}
func WaitOnExit() int {
atomic.AddInt32(&exitWaiterCount, 1)
return <-exitWaiterChan
}
func exitChanWaiter(waiterChan chan int) {
waiterChan <- <-exitWaiterChan
}
func WaitOnExitChan(waiterChan chan int) {
atomic.AddInt32(&exitWaiterCount, 1)
go exitChanWaiter(waiterChan)
}