On Wed, Jul 24, 2019 at 1:36 PM B Carr <buc...@gmail.com> wrote:
>
>
>
> On Wednesday, July 24, 2019 at 1:11:31 PM UTC-6, Burak Serdar wrote:
>>
>> On Wed, Jul 24, 2019 at 12:37 PM B Carr <buc...@gmail.com> wrote:
>> >
>> > Am I correct in thinking that the unique goroutine is active for the
>> > entirety of the connection session? Everything between the "goroutine
>> > spins up" and "goroutine
>> > spins down" is handled in the one, single goroutine? That the concurrency
>> > is automatic at that point?
>>
>> If that handler goroutine doesn't start others, then that's correct. I
>> don't understand what you mean by "concurrency is automatic".
>
>
> Thank you. What I meant by the concurrency comment is that the http server
> takes care of allowing multiple, same-webpage sessions to occur
> simultaneously via goroutines and that I don't have to include any 'go
> func(...)' lines in my code for that to happen. And I don't have the handler
> goroutine starting up any others.
Correct.
>
> I'm mostly interested in the degree of insulation one goroutine has from
> another. My extensive reading indicates that absent a goroutine intentionally
> communicating outside of itself (via a channel), that whatever it does (short
> of making changes to globally accessible resources such as a database or map)
> can't be seen by other goroutines. Is that a correct assessment?
Not precisely. The shared resource doesn't have to be global, but
simply accessible from more than one goroutine.
i:=1
go func() { do something with i } ()
go func() { do something else with i} ()
The variable i is not global but shared between three goroutines (the
two, and the one that spawned the other two). Any modification done to
i by one goroutine has no guarantees to being seen by others unless
there is synchronization.
>
> My basic problem is that I'm coming from a Visual Basic background and
> unlearning bad programming habits is causing me to stumble a lot. Go is far
> superior to Visual Basic and I'm having fun converting a VB app into a Go
> webserver app.
>
> But I'm learning a lot too, and so very much appreciate your evaluations.
> Thank you.
>
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