i wanted to do it without a Mutex but there still something not clear to me, but i don't know what it is and i don't understand what "trigger" synchronization means
i will keep reading, and go back to it later and see it i get it thanks for your help On Sunday, February 19, 2017 at 9:32:28 AM UTC+2, Jesse McNelis wrote: > > On Sun, Feb 19, 2017 at 3:59 PM, Marwan abdel moneim <mrwn...@gmail.com > <javascript:>> wrote: > > i'm reading a book about concurrency, and was doing some baby steps > > so i'm trying to manage a variable changes to be locked when a process > > starts and freed when it ends > > > > this is the initial code https://play.golang.org/p/qGraa8yQEc > > and this is my solution https://play.golang.org/p/wC9tcbpVjf > > > > my question is, when i run the last code through the race detector i get > > this > > > > while it actually works as it should be ( the first invoked goruotines > lock > > the variable and even if it takes time, the other goroutines can't > access > > the variable) > > > > so is there any problem here? > > > > The problem is that assignment to a bool doesn't trigger > synchronisation between processors. > Each processor will continue to only see their own version of the > value of the variable 'locked', until such time as synchronisation > occurs. > > A sync.Mutex will trigger synchronisation when locked and unlocked. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
