Golang中 channel 以及 groutine 理解
1、Curious Channels
A closed channel never blocks
A nil channel always blocks
A send to a nil channel blocks forever
A receive from a nil channel blocks forever
A send to a closed channel panics
A receive from a closed channel returns the zero value immediately
2.Never start a goroutine without knowing how it will stop
Every time you write the statement go in a program, you should consider the question of how, and under what conditions, the goroutine you are about to start, will end.
select会按照随机的顺序检测各case语句中channel是否ready，如果某个case中的channel已经ready则执行相应的case语句然后退出select流程，如果所有的channel都未ready且没有default的话，则会阻塞等待各个channel
引用:
https://dave.cheney.net/2016/...
【Golang中 channel 以及 groutine 理解】https://dave.cheney.net/2013/...
https://dave.cheney.net/2014/...
The Behavior Of Channels:
https://www.ardanlabs.com/blo...
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