Re: [KOS] semaphore.h?

[Luke B. <ka...@gm...>]

OK yeah I was hoping I could just piggy back on the pthread stuff, but
you're right I'll code a proper backend.

Thanks!

On 27 January 2016 at 14:49, Lawrence Sebald <ljs...@us...
> wrote:

> POSIX semaphores are a bit different than KOS semaphores for a couple of
> reasons. Chief amongst them is that POSIX semaphores can be used for
> cross-process synchronization, which is obviously inapplicable in KOS as we
> have no concept of processes. Also POSIX semaphores are often (but not
> required to be) implemented as files in the filesystem, which is pretty
> helpful in implementing their cross-process support.
>
> I’d recommend just porting the threading stuff over to KOS threads
> wholesale if you’re porting SDL2 rather than trying to use the pthreads
> stuff. It shouldn’t be hard to port it properly, plus then you have less
> overhead to deal with (since the pthreads stuff just calls down to the KOS
> stuff anyway). Also, I haven’t really been paying any attention to the
> pthreads stuff for a while…
>
> - Lawrence
>
> > On Jan 27, 2016, at 5:14 AM, Luke Benstead <ka...@gm...> wrote:
> >
> > Hi,
> >
> > I've tentatively started porting SDL 2 to KOS - I have it successfully
> compiling, I've just started swapping out all the generic/dummy
> implementations of the subsystems with KOS specific ones. I've done the
> timer backend and now I'm working on the thread backend.
> >
> > I noticed that the existing pthreads backend in SDL 2 would probably
> work on KOS, but SDL looks for "semaphore.h" which apparently doesn't exist
> in KOS, but does exist in newlib. There also seems to be a very similar
> semaphore implementation in "kos/sem.h".
> >
> > Before I implement a wrapper around kos/sem.h to make the SDL 2 pthreads
> stuff compile, I just wondered if there was a reason why semaphore.h isn't
> available in KOS by default, and would it be better if I perhaps altered
> the semaphore.h from newlib (in a similar way to pthread.h) and sent a
> patch to KOS?
> >
> > Thanks,
> >
> > Luke.
> >
> ------------------------------------------------------------------------------
> > Site24x7 APM Insight: Get Deep Visibility into Application Performance
> > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
> > Monitor end-to-end web transactions and take corrective actions now
> > Troubleshoot faster and improve end-user experience. Signup Now!
> >
> http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140_______________________________________________
> > cadcdev-kallistios mailing list
> > cad...@li...
> > https://lists.sourceforge.net/lists/listinfo/cadcdev-kallistios
>
>
>
> ------------------------------------------------------------------------------
> Site24x7 APM Insight: Get Deep Visibility into Application Performance
> APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month
> Monitor end-to-end web transactions and take corrective actions now
> Troubleshoot faster and improve end-user experience. Signup Now!
> http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140
> _______________________________________________
> cadcdev-kallistios mailing list
> cad...@li...
> https://lists.sourceforge.net/lists/listinfo/cadcdev-kallistios
>