On Wed, Oct 12, 2016 at 1:33 AM Minglangjun Li <[email protected]> wrote:
> On Wed, Oct 12, 2016 at 11:53 AM, Jesse McNelis <[email protected]> > wrote: > > If you have multiple CPUs (and the Go memory model assumes that you > always can) they won't even write updated values from their cache out > to main memory until they hit a lock. > The reading CPU has read a value from main memory and put it in it's > cache, it assumes that value won't change in main memory unless it > hits a lock of it's own. > > If you don't lock then both CPUs will just sit in their own little > world updating and reading values in their own caches and are never > aware of each other. > > > Thanks Jesse. Good to know that. > > On Wed, Oct 12, 2016 at 3:26 PM, John Souvestre <[email protected]> > wrote: > > I see that others have already addressed the locking issued, but I noticed > something else. I don’t understand why you are using “select”. With only > one case, I think that it’s normally going to fail and exit the select > block, then loop due to the “for”. This will make it run constantly. > > That's not true. One of the select cases has to be satisfied; there is no failure. If there were a default case, that would be selected if no other case is ready. Without a default case, the select will block until one of the cases is ready. A single-case select can be replaced with a single send statement or receiving into a variable. > If you get rid of the “select” then the loop will block until something > comes in from the channel. > > > > John > > John Souvestre - New Orleans LA > > > Please forgive me for that. I haven't been familiar with Go. > > -- > 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 [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
