约 400 字 预计阅读 2 分钟
管道 channel：
环形队列，先进先出，多个协程读一个容器
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package main
import (
"fmt"
"time"
)
func main() {
ch := make(chan int, 1)//为0则无缓冲，但能正常写入读取
go func() {
a := <-ch
fmt.Printf("读出成功%d\n", a)
}()
time.Sleep(time.Second * 1)
go func() {
ch <- 1
fmt.Printf("写入成功%s", "1")
}()
time.Sleep(time.Second * 1)
}
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package main
import (
"fmt"
"sync"
)
func main() {
ch := make(chan int, 100) // 缓冲 channel，容量 100
wg := sync.WaitGroup{}
wg.Add(2)
go func() {
defer wg.Done()
for i := 0; i < 10; i++ {
ch <- i
}
}()
go func() {
defer wg.Done()
for i := 0; i < 10; i++ {
ch <- i
}
}()
wg2 := sync.WaitGroup{}
wg2.Add(1)
go func() {
sum := 0
for {
a, ok := <-ch
if !ok { //channel为空、被关闭、就为false
break
} else {
sum += a
}
}
fmt.Println("sum=", sum)
wg2.Done()
}()
wg.Wait()
close(ch)
wg2.Wait()
}
|
用管道去阻塞
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package main
import (
"fmt"
"sync"
)
func main() {
ch := make(chan int, 100) // 缓冲 channel，容量 100
wg := sync.WaitGroup{}
wg.Add(2)
go func() {
defer wg.Done()
for i := 0; i < 10; i++ {
ch <- i
}
}()
go func() {
defer wg.Done()
for i := 0; i < 10; i++ {
ch <- i
}
}()
c2 := make(chan struct{}, 0)
go func() {
sum := 0
for {
a, ok := <-ch
if !ok { //channel为空、被关闭、就为false
break
} else {
sum += a
}
}
fmt.Println("sum=", sum)
c2 <- struct{}{}
}()
wg.Wait()
close(ch)
<-c2
}
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