Is a struct actually copied between goroutines if sent over a Golang channel?
<p>If a large struct is sent over a channel in Go, is it actually copied between goroutines?</p>

<p>For example, in the code below, will Go actually copy all largeStruct data between goroutines producer and consumer?</p>

<pre><code>package main

import (
    "fmt"
    "sync"
)

type largeStruct struct {
    buf [10000]int
}

func main() {
    ch := make(chan largeStruct)
    wg := &amp;sync.WaitGroup{}
    wg.Add(2)
    go consumer(wg, ch)
    go producer(wg, ch)
    wg.Wait()
}

func producer(wg *sync.WaitGroup, output chan&lt;- largeStruct) {
    defer wg.Done()
    for i := 0; i &lt; 5; i++ {
        fmt.Printf("producer: %d\n", i)
        output &lt;- largeStruct{}
    }
    close(output)
}

func consumer(wg *sync.WaitGroup, input &lt;-chan largeStruct) {
    defer wg.Done()
    i := 0
LOOP:
    for {
        select {
        case _, ok := &lt;-input:
            if !ok {
                break LOOP
            }
            fmt.Printf("consumer: %d\n", i)
            i++
        }
    }
}
</code></pre>

<p>Playground: <a href="http://play.golang.org/p/fawEQnSDwB" rel="noreferrer">http://play.golang.org/p/fawEQnSDwB</a></p>