Re: [KOS] semaphore.h?

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

Done! You can keep an eye on my progress here:
https://gitlab.com/Kazade/kos-ports/commits/master

On 27 January 2016 at 15:22, Luke Benstead <ka...@gm...> wrote:

> 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.
>> >
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