大佬教程收集整理的这篇文章主要介绍了带buffer的chan能同步吗?,大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。
具体看下面2个例子:
无 buffer 的: http://play.golang.org/p/RwPbCcueWh
func main() { ch := make(chan bool) go func() { println("fuck buffer chAnnel") <-ch }() ch <- true }
@R_598_5343@的: http://play.golang.org/p/YV9H6WPYuJ
func main() { ch := make(chan bool,1) go func() { println("fuck buffer chAnnel") <-ch }() ch <- true }
第二个程序(@R_598_5343@的chan)无法保证收/发同步,导致main退出时 println
还未执行. 说明带buffer的chan是不能保证收/发同步.
下面是一个构造的测试例子 http://play.golang.org/p/vQQCv9nG15
package main import ( "fmt" "sync" "time" ) func main() { testNoBufferChan() TESTBufferChan() } func testNoBufferChan() { wg := new(sync.WaitGroup) ch := make(chan bool) wg.Add(1) go func() { defer wg.Done() time.Sleep(10 * time.Second) fmt.Println(time.Now(),"NoBufferChan recv begin") <-ch fmt.Println(time.Now(),"NoBufferChan recv end") }() fmt.Println(time.Now(),"NoBufferChan send begin") ch <- true fmt.Println(time.Now(),"NoBufferChan send end") wg.Wait() } func TESTBufferChan() { wg := new(sync.WaitGroup) ch := make(chan bool,1) wg.Add(1) go func() { defer wg.Done() time.Sleep(10 * time.Second) fmt.Println(time.Now(),"BufferChan recv begin") <-ch fmt.Println(time.Now(),"BufferChan recv end") }() fmt.Println(time.Now(),"BufferChan send begin") ch <- true fmt.Println(time.Now(),"BufferChan send end") wg.Wait() }
在 play 上的结果(play上的是假时间):
2009-11-10 23:00:00 +0000 UTC NoBufferChan send begin 2009-11-10 23:00:10 +0000 UTC NoBufferChan recv begin 2009-11-10 23:00:10 +0000 UTC NoBufferChan recv end 2009-11-10 23:00:10 +0000 UTC NoBufferChan send end 2009-11-10 23:00:10 +0000 UTC BufferChan send begin 2009-11-10 23:00:10 +0000 UTC BufferChan send end 2009-11-10 23:00:20 +0000 UTC BufferChan recv begin 2009-11-10 23:00:20 +0000 UTC BufferChan recv end
在本机运行的结果:
2014-05-09 10:41:17.5611304 +0800 CST NoBufferChan send begin 2014-05-09 10:41:27.5637025 +0800 CST NoBufferChan recv begin 2014-05-09 10:41:27.5637025 +0800 CST NoBufferChan recv end 2014-05-09 10:41:27.5637025 +0800 CST NoBufferChan send end 2014-05-09 10:41:27.5647026 +0800 CST BufferChan send begin 2014-05-09 10:41:27.5647026 +0800 CST BufferChan send end 2014-05-09 10:41:37.5662746 +0800 CST BufferChan recv begin 2014-05-09 10:41:37.5662746 +0800 CST BufferChan recv end
可以发现带Buffer的chan收/发完成时间相差了10秒.
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