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Method 1: use two channel

Channel CA must have a buffer here, or it will end up with an error fatal error: all goroutines are asleep-deadlock!

This is because the unbuffered channel can be sent successfully only when the receiver can receive the value, otherwise it will always be in the stage of waiting for transmission. Because there is no co-program to receive data from the CA channel after the last alternate run, the deadlock will always be blocked.

Package mainimport ("fmt"sync") var wg sync.WaitGroupvar CA chan intvar CB chan intfunc main () {wg = sync.WaitGroup {} CA = make (chan int,1) CB = make (chan int) wg.Add (2) go A () go B () CA

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