在go1.13.5试验多种情况下的运行时行为。注意看代码和注释。
package main
func main() {
//var ch chan int
//// fatal error: all goroutines are asleep - deadlock!
//ch <- 1
//var ch chan int
//// fatal error: all goroutines are asleep - deadlock!
//<- ch
//var ch chan int
//// panic: close of nil channel
//close(ch)
//ch := make(chan int, 1)
//close(ch)
//// panic: send on closed channel
//ch <- 1
//ch := make(chan int, 1)
//close(ch)
//// immediately return
//<- ch
//ch2 := make(chan int, 1)
//ch2 <- 5
//close(ch2)
//// return one item
//x := <- ch
//log.Printf("x[%+v]", x)
//ch := make(chan int, 1)
//close(ch)
//// panic: close of closed channel
//close(ch)
//ch := make(chan int)
//select {
//case <-ch: // fatal error: all goroutines are asleep - deadlock!
//}
}
