I am trying to increment a value using go function & invoke the function as goroutine, but i am getting error.
Here is the Code:
package main
import (
"fmt"
)
func incNum(ch chan int) {
val := <-ch
ch <- val + 10
}
func main() {
ch := make(chan int)
ch <- 10
go incNum(ch)
fmt.Println("Result", ch)
}
I tried adding the wait also but doesn't work:
ch := make(chan int)
wg.Add(1) // 2
ch <- 10
go incNum(ch)
wg.Wait() // 4
fmt.Println("Result", ch)
Below is the error:
fatal error: all goroutines are asleep - deadlock!
Please Help!
In your code snippet, main goroutine blocking in putting value in zero buffered channel:
func incNum(ch chan int) {
val := <-ch // release value
ch <- val + 10
}
func TestName(t *testing.T) {
ch := make(chan int) // zero buffered channel
ch <- 10 // main goroutine is blocked while ch will released value (on zero buffered chan)
go incNum(ch)
//fmt.Println("Result", ch)
fmt.Println("Result", <-ch)
}
move go incNum(ch) before ch <- 10
func TestName(t *testing.T) {
ch := make(chan int) // zero buffered channel
go incNum(ch)
ch <- 10
//fmt.Println("Result", ch)
fmt.Println("Result", <-ch)
}