Re: Mailsemaphore / pthread library / PDASoftware

DINH Viet Hoa a écrit :
> 
> Rajko Albrecht wrote :
> 
> > as I seen libetpan in its current cvs version uses semaphores for threadsafe
> > library.
> >
> > Of course this is fine, but not on PDAs :(
> >
> > linking again libpthread means one not wanted depend to external lib more. So
> > I think (and others from OPIE team, too) that there should be a flag while
> > configure disabling the built-in threadsafe mechanism or references to
> > libpthread. Otherwise we run into a little bit trouble and libetpan becomes
> > unuseable to us.
> 
> That things is only used in the future multithreaded engine.
> I will try to make it possible to disable this.

Thoughts about this :

Obviously a configure flag such as --disable-threads and stubs around
semaphore calls (either macros, or static inlines, or ifdef arounds)
would solve your problem on PDA.

However, on regular hosts, this would mean the library could exist on a
system in two different forms (either multithreaded or not). Since
libetpan based applications will be designed to run in either modes, but
not both, the two variants of the library need to be somehow binary
incompatible, either with the linker (versionning?), or maybe something
simple such as having two different separate names for the library
(which is what QT does if I remember well), say libetpan for the
regular, multithread one, and libetpan-nt or something like that for the
other one... Depending on the configure flag either library could be
built, or maybe both if the threading stuff is isolated in an optionnal
object file.

Gaël.

-- 
Gaël Roualland -+- [email protected]


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