[haiku] Re: Any plans for pthread support?
- From: Roland Plüss <roland@xxxxxxx>
- To: haiku@xxxxxxxxxxxxx
- Date: Wed, 23 Sep 2009 13:36:57 +0200
Ryan Leavengood wrote:
> On Tue, Sep 22, 2009 at 2:10 PM, Roland Plüss <roland@xxxxxxx> wrote:
>
>> Now it is possible I didn't get the implementation in Haiku but right now it
>> looks to me that this semaphore implementation is like an ordinary mutex
>> without condition support and that the posix compatibility layer simply
>> emulates a condition variable using semaphores.
>>
>
> Yes we implement condition variables using semaphores, which is not
> "emulation", it is just one way to implement them. As Bruno implied
> semaphores are a lower level thread primitive that can be used to
> build higher level constructs such as condition variables, read-write
> locks, queues, etc. I wrote the original pthread condition variable
> implementation, which was improved by Ingo (who knows his stuff.)
>
> Now we do actually have kernel land condition variables too, which
> might be implemented more directly, but I suspect they too are built
> on lower level constructs.
>
>
I didn't mean "emulation" in a negative way. With "emulating" I simply
meant to provide a functionality which is not exposed directly using
other constructs. Nothing wrong with that and the Posix compat layer
does work ( at last my threading test cases in the engine pass so I
assume so ). I can implementing this all using sems later on but right
now it is easier for me to simply compile against pthreads support like
I do on other Unix systems.
--
Yours sincerely
Plüss Roland
Leader and Head Programmer
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