Re: Mailsemaphore / pthread library / PDA Software

Am Sonntag, 17. Oktober 2004 15:56 schrieb DINH Viet Hoa:
> Rajko Albrecht wrote :
> > Of course this is fine, but not on PDAs :(
>
> Waht is available on your PDA target.
> Because, I noticed that there were some pthread calls that seemed to
> work fine on your PDA, such as pthread_mutex_lock().
>
> Do you have any detailed information about POSIX thread availability
> on your PDA plateform ?
>
> Is /usr/include/semaphore.h present ?

Yes, of course its all present. I think I had said it in a wrong way: Per 
default on linux-based PDAs is a libpthread. The problems are more the gui 
(qt/Embedded based) cause qt/Embedded 2 isn't threadsafe. (otherwise it will 
linked against pthread itself). 

Due size limits and so on we must try to reduce the dependies to external 
libs. Eg.: we can not use threads with qt/E 2. So we will not build threaded 
applications. (We == OPIE team). So we don't require the libpthread linked to 
apps.

Otherwise: newser QT/E are threadsafe. eg., are linked against pthread. But: 
then we will create threaded applictions in another way, eg., we make our 
apps threadsafe on a higher level. Eg., we don't require thread-safe base 
libs (from our point of view etpan is such a baselib) (at current moment I 
see). 

May be that later we require that or it isn't a size/runtime problem linking 
apps against libpthread (or other: in threaded QT/E all apps are linked 
against pthread). But this moment its just not used and makes our apps a 
little bit slower and larger. And last isn't that good on small handheld 
systems ;)

Rajko
p.s.: I forgot: As I see and got reported the libetpan + OPIE-Mail are working 
real fine and stable and meanwhile there is at least on clone of opiemail for 
linux-based handhelds out, eg. not for OPIE but for qt-based handhelds.
good work getting libetpan working with ARM.


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