To Ian’s point, you can try to synchronize using an external shared or multiple synced clocks - but the error is too great when comparing cpu frequency events.
> On May 5, 2021, at 4:34 PM, Bakul Shah <ba...@iitbombay.org> wrote: > > On May 5, 2021, at 9:55 AM, Øyvind Teig <oyvind.t...@teigfam.net> wrote: >> >> Here is my cognitive test case. It is not 100% realistic, but it's just to >> convey my point: >> hiPri is a disconnect message of a smoke detetector. loPri is a fire alarm. >> If the disconnect hiPri is activated before (1 sec to 1 ns) or >> simulatenously (same polling of "hw pins") as the alarm loPri there should >> be no alarm being sent to the fire department. No emergency fire trucks. Not >> ever. There should not be any case of some low probability where this may >> happen. However, if the hiPri disconnect message was activated after the >> alarm, then it was too late, and the alarm will go off. (Disconnect was >> because we knew that there was going to be an alarm since we were doing >> something, and we explicitly did not want the fire trucks to come) > > Imagine that the latency between the device detecting a disconnect > signal and a user hitting a disconnect button is D ns while the fire > detection latency is F ns. So if D > F the device would raise the > alarm even if you implement it all in hardware! The only difference > between a Go implementation vs a hardware one is the window size. > If you want to make it minimize it, Go is not the right solution. > For that, in H/W you'd probably *gate* the alarm line to the fire > department with the disconnect signal! But even so there is a small > window. > > I think if you have a mix of hard and soft real time requirements, > where soft RT tasks can take a long time, you'd likely want priority > scheduling with preemption. IMHO Go is the wrong choice for that. > > -- > 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. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/73C1590D-F77A-4613-B522-3DFE1A3FA0BE%40iitbombay.org. -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/D5A22BDE-A2BB-4CD6-858A-3CB7B5E3B721%40ix.netcom.com.
