Golang Channel Select

This is a creation in Article, where the information may have evolved or changed.

Support for channel in Golang added the Select keyword,

The implementation of channel Select in Golang is referenced by examples such as monitoring, timers, and so on http://blog.csdn.net/kjfcpua/article/details/18263839

The execution process is a bit like a switch case,case after the channel output can be received with a variable: num:=<-ch

If all the channel after the case has no output, then continue to follow the bad wait, if all the channel after the case has output, then randomly select a case execution.

However, there is a big difference between the for and for the bad, it should be added to the sleep mechanism, will not be full CPU, the following program monitoring program, with a for loop contrast.

1 package Main

2
3 Import (
4 "Time"
5)
6 var quit Chan int = make (chan int)
7 func loop (ch Chan int) {
8 Select {
9 Case &LT;-CH:
Ten case <-time. After (time. Duration (*time). Second): Quit <-0
11}
12}
Func gofor (ch Chan int) {
for{
_,ok:= <-ch;
If OK {
Break
18}
19}
20}
Func Main () {
CH: = make (chan int)
23/*
Close (CH)
Loop (CH)
<-quit
27 */
Gofor Go (CH)
Time. Sleep (10*time. Second)
ch<-0
31}

Results Analysis:

Execution channel SELECT:CPU occupies 0%

Execute for loop: 101% CPU consumption