Posix semaphore between different processes

[Kaz Kylheku]

On Wed, 29 Nov 2000, H . J . Lu wrote:

> 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.

Why? Function pointers be used to bind a different set of operations for a
process-shared semaphore at run time.  Going to the kernel for inter-thread
semaphore operations would be a drag.