Guide Shared Memory and Semaphore Management

Shared Memory and Semaphore Issues!!!

YOU NEED TO CLEAN UP YOUR SHARED MEMORY AND SEMAPHORES

• When you create shared memory or semaphores be sure to create them with a protection that makes them easy to manage, e.g.,
  • 0644 - read/writeable by owner, read by group and by world
  • 0666 - read/writeable by owner, by group and by world

• Make sure to use:
  • sem_close and sem_unlink to get remove semaphores.
  • shm_unlink to remove shared memory.

• Use /usr/bin/ipcs to see what is left after your programs have all terminated. Do this before leaving the lab.

• Use /usr/bin/ipcrm to remove what is left after your programs have all terminated. Do this before leaving the lab.

  A bash script to remove all your ipc remnants ipcsscript1.txt