Commit 2295554d authored by Dmitriy Vyukov's avatar Dmitriy Vyukov

sync: add Once example

R=golang-dev, rsc, bradfitz
CC=golang-dev
https://golang.org/cl/5715046
parent 986df83e
......@@ -5,6 +5,7 @@
package sync_test
import (
"fmt"
"net/http"
"sync"
)
......@@ -32,3 +33,22 @@ func ExampleWaitGroup() {
// Wait for all HTTP fetches to complete.
wg.Wait()
}
func ExampleOnce() {
var once sync.Once
onceBody := func() {
fmt.Printf("Only once\n")
}
done := make(chan bool)
for i := 0; i < 10; i++ {
go func() {
once.Do(onceBody)
done <- true
}()
}
for i := 0; i < 10; i++ {
<-done
}
// Output:
// Only once
}
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment