Ian Lance Taylor <ian@airs.com> writes:
> The POSIX semaphore interface comes from the pthreads work. In my
> opinion, the System V IPC calls are badly designed.
Badly implemented, I'll grant you --- the resource limits in a typical
configuration are ridiculously low. I'm not sure the API as such is
particularly good or bad.
> However, on systems which do fully implement POSIX semaphores, it
> should be easy for Postgres to use them. They should be created in
> the shared memory segment.
Huh? Are POSIX semaphores objects in user memory space, instead of
in the kernel? I'm getting more and more confused. Where can I find
a description of the POSIX version of semaphores?
BTW, should I expect that POSIX also ignored the SysV IPC spec for
shared memory?
regards, tom lane
