Semaphore Count Inconsistency between Oracle Linux 7 and Oracle Linux 6
(Doc ID 2226195.1)
Last updated on SEPTEMBER 17, 2021
Applies to:Linux OS - Version Oracle Linux 7.0 and later
Oracle Cloud Infrastructure - Version N/A and later
Kernel versions greater than 3.8. ipcs -s -i <id> shows 0 for zcount, even though a process is blocked waiting for a semaphore value to reach zero.
The process used an array of semops with multiple entries.
Four small C modules are used to create a semaphore array and then the "semid" is checked with "ipcs -s -i" command.
Only the test with "semztest2" module returns a zero value in zcount value in OL7 where it should be non zero.
To view full details, sign in with your My Oracle Support account.
Don't have a My Oracle Support account? Click to get started!
In this Document