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34 lines
1.2 KiB
Go
34 lines
1.2 KiB
Go
package main
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import (
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"fmt"
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"time"
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)
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// https://nanxiao.gitbooks.io/golang-101-hacks/content/posts/unbuffered-and-buffered-channels.html
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// After the main goroutine is launched, it will sleep immediately("Main goroutine sleeps 2 seconds" is printed),
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// and this will cause main goroutine relinquishes the CPU to the func goroutine("Func goroutine begins sending data" is printed).
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// But since the main goroutine is sleeping and can't receive data from the channel,
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// so ch <- 1 operation in func goroutine can't complete until d := <- ch in main goroutine is executed(The final 3 logs are printed).
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func main() {
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ch := make(chan int)
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go func(ch chan int) {
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fmt.Println("Func goroutine begins sending data")
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// sender will block on the channel until the receiver receives the data from the channel
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ch <- 1
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fmt.Println("Func goroutine ends sending data")
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}(ch)
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fmt.Println("Main goroutine sleeps 2 seconds")
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time.Sleep(time.Second * 2)
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fmt.Println("Main goroutine begins receiving data")
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// the receiver will also block on the channel until sender sends data into the channel.
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d := <-ch
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fmt.Println("Main goroutine received data:", d)
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time.Sleep(time.Second)
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}
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