package main
import (
"fmt"
"runtime"
"sync"
)
func main() {
var num int
mu := new(sync.RWMutex)
cond := sync.NewCond(mu.RLocker())
var wg sync.WaitGroup
wg.Add(2)
f1 := func() {
mu.RLock()
fmt.Println("f1 waiting")
cond.Wait()
fmt.Println("f1:", num)
mu.RUnlock()
wg.Done()
}
f2 := func() {
mu.Lock()
num = num + 1
mu.Unlock()
cond.Signal()
fmt.Println("f2 signal")
wg.Done()
}
go f1()
runtime.Gosched()
go f2()
wg.Wait()
fmt.Println("end")
}
posted on 2018-01-10 22:21 angry-baby 阅读(925) 评论(0) 编辑 收藏 举报