• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 392
  • Last Modified:

Using Named Semaphores in HP-UX 10.20 - How?

I'm adding the use of a named semaphore to an old project I have running under HP-UX-10.20. The project compiles and links fine (plain-ole HP-C compiler), but at runtime I get an error that the function sem_open is not available. Is there something else I need to do? We're running the Korn Shell. Could this be the problem?
  • 2
1 Solution
Can you post the exact lines which appears during run time.Also what options you are using while compilation ?
ping ping
Did you check for a man page for sem_open() on the machine?  I've only got 11.0 boxes around here, but I'm fairly sure that the POSIX semaphores were not formerly supported until 10.30 (which was very limited release, so really not until 11.0).

See the 10.30 release notes at:

You may also find that POSIX semaphores are actually part of the POSIX Real-Time specification, under 11.0 they are not in libc, but rather librt.  Try linking with -lrt as a last resort.
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now