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                > # channel 死鎖 > ### 例子一 - 死鎖 ~~~ package main func main() { ch := make(chan int) ch <- 1 //channel 長度為0, 發送阻塞, 死鎖 println(<-ch) } ~~~ - 不會死鎖 ~~~ package main func main() { ch := make(chan int, 1) ch <- 1 //channel 長度為0, 發送阻塞, 死鎖 println(<-ch) } ~~~ > ### 例子二 - fatal error: all goroutines are asleep - deadlock! ~~~ package main import ( "fmt" ) func main() { ch := make(chan int) Receive(ch) } // 限制只能發送 func Receive(ch <-chan int) { fmt.Println(<-ch) } // 限制只能接收 func Send(ch chan<- int) { ch <- 1 } ~~~ - Go 語言的調度器會檢測死鎖,如果主 Goroutine 和所有其他 Goroutine 都處于等待狀態而沒有繼續執行的代碼,則程序會崩潰并提示死鎖錯誤。 - 主 Goroutine 死鎖, 其它Goroutine 沒死鎖還能正常運行 ~~~ package main import ( "fmt" "time" ) func main() { go func() { for { fmt.Println(1) time.Sleep(time.Second) } }() ch := make(chan int) Receive(ch) } // 限制只能發送 func Receive(ch <-chan int) { fmt.Println(<-ch) } // 限制只能接收 func Send(ch chan<- int) { ch <- 1 } ~~~
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