39 lines
842 B
Go
39 lines
842 B
Go
// Go's _select_ lets you wait on multiple channel
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// operations. Combining goroutines and channels with
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// select is a powerful feature of Go.
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package main
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import "time"
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import "fmt"
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func main() {
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// For our example we'll select across two channels.
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c1 := make(chan string)
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c2 := make(chan string)
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// Each channel will receive a value after some amount
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// of time, to simulate e.g. blocking RPC operations
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// executing in concurrent goroutines.
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go func() {
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time.Sleep(1 * time.Second)
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c1 <- "one"
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}()
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go func() {
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time.Sleep(2 * time.Second)
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c2 <- "two"
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}()
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// We'll use `select` to await both of these values
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// simultaneously, printing each one as it arrives.
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for i := 0; i < 2; i++ {
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select {
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case msg1 := <-c1:
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fmt.Println("received", msg1)
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case msg2 := <-c2:
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fmt.Println("received", msg2)
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}
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}
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}
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