Channel use of Golang

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

Reprint: http://my.oschina.net/goskyblue/blog/191149

Channel

Sample1 Close twice

ch := make(chan bool)close(ch)close(ch)  // 这样会panic的，channel不能close两次

The channel was closed early when it was read.

ch := make(chan string)close(ch)i := <- ch // 不会panic, i读取到的值是空 "",  如果channel是bool的，那么读取到的是false

Write data to a channel that has been closed HTTP://PLAY.GOLANG.ORG/P/VL5D5TKFL7

ch := make(chan string)close(ch)ch <- "good" // 会panic的

Determine if the channel is close

i, ok := <- chif ok {    println(i)} else {    println("channel closed")}

For Loop Read Channel

for i := range ch { // ch关闭时，for循环会自动结束    println(i)}

Prevent read Timeouts

select {    case <- time.After(time.Second*2):        println("read channel timeout")    case i := <- ch:        println(i)}

Prevent write Timeouts HTTP://PLAY.GOLANG.ORG/P/AODFPNWDMJ

// 其实和读取超时很像select {    case <- time.After(time.Second *2):        println("write channel timeout")    case ch <- "hello":        println("write ok")}