Re: [Linuxsampler-devel] GUI thoughts

[Matthias W. <mat...@in...>]

On Fri, Nov 15, 2002 at 07:22:35PM -0800, Josh Green wrote:
> > AFAIK there are no r/w locks in the current linuxthread implementation.
> > I read about plans to include those in connection with the NPT (native
> > posix threads).
> > 
> > matthias
> > 
> 
> What about pthread_rwlock_t (you can see this in
> /usr/include/pthread.h). I notice that the function prototypes are
> surrounded by an "#ifdef __USE_UNIX98" which I'm unfamiliar with. I can
> do a "p sizeof (pthread_rwlock_t)" in gdb with a pthread linked program,
> so it seems to be available (32 bytes a mutex, not bad I guess). Cheers.
> 	Josh Green

I played around with this when I needed 'pthread_mutexattr_settype' and 
found out that I had to define

#define _XOPEN_SOURCE 600

before the first system include in my code; this will set some other defines
in /usr/include/features.h . I have to note that lots of basic types (I
guess one of it was size_t) got screwed up so I had to drop it again.

Besides, I'd try to use atomic types and atomic read/writes to avoid
locking wherever possible.

matthias