[NOTE] Updated January 15, 2019. This article may have outdated content or subject matter.
channel基础语法
channel常见实例
channel
读取关闭的无缓存通道
读取关闭后的无缓存通道,不管通道中是否有数据,返回值都为0和false。
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package main
import (
"fmt"
"time"
)
func main() {
done := make(chan int)
go func() {
done <- 1
}()
time.Sleep(5 * time.Second)
close(done)
for i := 1; i <= 3; i++ {
t, ok := <-done
fmt.Println(i, ":", t, ok)
}
}
|
运行结果:
1 : 0 false
2 : 0 false
3 : 0 false
读取关闭的有缓存通道
读取关闭后的有缓存通道,将缓存数据读取完后,再读取返回值为0和false。
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package main
import (
"fmt"
"time"
)
func main() {
done := make(chan int, 1)
go func() {
done <- 1
}()
time.Sleep(5 * time.Second)
close(done)
for i := 1; i <= 3; i++ {
t, ok := <-done
fmt.Println(i, ":", t, ok)
}
}
|
运行结果:
1 : 1 true
2 : 0 false
3 : 0 false
4、range遍历通道:
通道写完后,必须关闭通道,否则range遍历会出现死锁。
参考
- Go 通道(chan)关闭和后续读取操作