package main
import (
"errors"
"log"
"time"
)
func main() {
err := f()
if err != nil {
log.Fatal(err)
}
}
func f() (err error) {
var rerr error
defer func() {
if rerr != nil {
err = rerr
}
}()
go func() {
rerr = longTask()
}()
time.Sleep(time.Second * 2)
return errors.New("f error")
}
func longTask() error {
time.Sleep(time.Second * 1)
return errors.New("long task error")
}
https://play.golang.org/p/mqpT8XBbeiN
Hi, Everyone! I'm newbie in go. Help needed.
As far as I learned, gorutines should pass "value" through channels.
There's more safe way to handle this kind of stuffs with using waitgroup,
context, channels....I thought, "sharing variable reference in gorutine" is
dangerous because of problems like transacion issue.
But what if that value is just single error? Is it still unsafe or may
cause panic?
"longTask" in examples is a task that I can garantee it will eventually
end.
I know little about low level programming. So not sure if I can write this
kind of code.
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