转到频道无效[重复]

Question

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• Goroutine sleep and deadlock in code. How to solve it? 2 answers

I want to use a global channel to send and receive between two goroutines. What is wrong in this program

https://play.golang.org/p/Y_9-rw0JoV

The global chan medium is not receiving the data in ProgB. Infact in ProgA program stucks at medium <- a.

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Answer 1

You forgot to initialise the channel. Here's how you do it:

var medium = make(chan int64)

Playground: https://play.golang.org/p/fEMcHlnxdV.