What is channel buffer size?

Question

c := make(chan int, 10) // channel with a buffer size of 10 What does it mean that the buffer size is 10? What specifically does the buffer size represent/limit?

Gopher · Accepted Answer

The buffer size is the number of elements that can be sent to the channel without the send blocking. By default, a channel has a buffer size of 0 (you get this with make(chan int)). This means that every single send will block until another goroutine receives from the channel. A channel of buffer size 1 can hold 1 element until sending blocks, so you'd get c := make(chan int, 1) c <- 1 // doesn't block c <- 2 // blocks until another goroutine receives from the channel The following code illustrates the blocking of unbuffered channel: package main import ( "fmt" "time" ) func main() { // to see the diff, change 0 to 1 c := make(chan struct{}, 0) go func() { time.Sleep(2 * time.Second) <-c }() start := time.Now() c <- struct{}{} elapsed := time.Since(start) fmt.Printf("Elapsed: %v
", elapsed) } https://play.golang.org/p/HuLcZLdXK_0

Go Language

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