Re: Posix semaphore between different processes

["H . J . Lu" <hjl at valinux dot com>]

> I don't even want to start with this.  All you can achieve is a poor
> quality imitation.  You cannot work with the SysV stuff alone since
> you cannot implement the namespace handling correctly.  Adding some
> regular files to implement the namespace side only means that you open
> all kind of security holes and possibilities to screw up the system.
> 
> If you want to have POSIX semaphores implement them in the kernel.
> Jakub has a POSIX message queue implementation, following the concept
> of the POSIX shared memory implementatino (i.e., use it to implement
> the SysV variant and add a pseudo filesystem).  You'll have to do the
> same for semaphores.

Are you suggesting we implement POSIX semaphore in kernel, including
the inter-thread one? I guess kernel can tell if 2 tasks belong to
the same process or not.


-- 
H.J. Lu (hjl@valinux.com)