Go言語によるチャンネル関連の説明

ChannelType = ( "chan" | "chan" "<-" | "<-" "chan" ) ElementType .

chan T          // 可以接收和发送类型为 T 的数据
chan<- float64  // 只可以用来发送 float64 类型的数据
<-chan int      // 只可以用来接收 int 类型的数据

c := make(chan bool) //创建一个无缓冲的bool型Channel
c <- x        //向一个Channel发送一个值
<- c          //从一个Channel中接收一个值
x = <- c      //从Channel c接收一个值并将其存储到x中
x, ok = <- c  //从Channel接收一个值，如果channel关闭了或没有数据，那么ok将被置为false

make(chan int, 100) #//创建一个有缓冲的int型Channel

// _Channels_ are the pipes that connect concurrent
// goroutines. You can send values into channels from one
// goroutine and receive those values into another
// goroutine.

package main

import "fmt"

func main() {

    // Create a new channel with `make(chan val-type)`.
    // Channels are typed by the values they convey.
    messages := make(chan string)

    // _Send_ a value into a channel using the `channel <-`
    // syntax. Here we send `"ping"`  to the `messages`
    // channel we made above, from a new goroutine.
    go func() { messages <- "ping" }()

    // The `<-channel` syntax _receives_ a value from the
    // channel. Here we&#39;ll receive the `"ping"` message
    // we sent above and print it out.
    msg := <-messages
    fmt.Println(msg)
}

// We can use channels to synchronize execution// across goroutines. Here's an example of using a// blocking receive to wait for a goroutine to finish.package mainimport "fmt"import "time"// This is the function we'll run in a goroutine. The// `done` channel will be used to notify another// goroutine that this function's work is done.func worker(done chan bool) {
    fmt.Print("working...")
    time.Sleep(time.Second)
    fmt.Println("done")    // Send a value to notify that we're done.
    done <- true}func main() {    // Start a worker goroutine, giving it the channel to
    // notify on.
    done := make(chan bool, 1)    go worker(done)    // Block until we receive a notification from the
    // worker on the channel.
    <-done
}