[Go - Note] Channel 阻塞deadlock和panic情况,以及close channel

阻塞:

发生一直阻塞时,会报如下deadlock错误:

fatal error: all goroutines are asleep - deadlock!
无缓存channel:
  1. 通道中无数据,但执行读通道。
  2. 通道中无数据,向通道写数据,但无协程读取。
有缓存channel:
  1. 通道的缓存无数据,但执行读通道。
  2. 通道的缓存已经占满,向通道写数据,但无协程读。

Panic:

1.向已经关闭的channel写。
2.关闭已经关闭的channel。

close channel:

You needn't close every channel when you've finished with it.It's only necessary to close a channel when it is important to tell the receiving goroutines that all data have been sent.

Note that it is only necessary to close a channel if the receiver is looking for a close. Closing the channel is a control signal on the channel indicating that no more data follows.

It's OK to leave a Go channel open forever and never close it. When the channel is no longer used, it will be garbage collected.

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