Golang Channel小结

确保接收

01 go func() {
02     p := <-ch // Receive
03 }()
04
05 ch <- "paper" // Send

以上代码，当05行发送之后，不同的channel接收者的行为不同。

channel类型：

• Buffered

  确保接收之后发送的代码才继续执行

• Unbuffered

  发送代码继续执行，不确保此时被接收

状态和行为

状态：

• nil

// ** nil channel
// A channel is in a nil state when it is declared to its zero value
var ch chan string
	
// A channel can be placed in a nil state by explicitly setting it to nil.
ch = nil

• open

// ** open channel

// A channel is in a open state when it’s made using the built-in function make.
ch := make(chan string)

• closed

// ** closed channel

// A channel is in a closed state when it’s closed using the built-in function close.
close(ch)

行为：

操作\状态	Nil	Open	Closed
Send	Blocked	Allowed	Panic
Receive	Blocked	Allowed	Allowed
Close	Panic	Allowed	Panic

reference

https://www.ardanlabs.com/blog/2017/10/the-behavior-of-channels.html

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