Questions on SPINCOUNT and Semaphores

Hello,
I have a few more questions on SPINCOUNT and semaphores.
1) The documentation states that SPINCOUNT = 0 (default) uses the spincount "built into the delivered binary".
- How can I find out what the built-in spincount is?
- What is the built-in spincount for a native client?
2) "Semaphore appears stuck" (Q_CAT 1447) is reported when the semaphore for a queue cannot be obtained.
- Does SPINCOUNT also apply to queue semaphores?
- What is the timeout for the semop? Ie, how long does a process wait before reporting 1447?
3) Is there a similar (to Semaphore appears stuck) error for other semaphores, such as GTT, AOM, etc)?
- If yes, what is the timeout?
Thanks...
Roger

Roger,
1) The default SPINCOUNT value is 0 (no spinning) for all platforms that are supported today. (At one time we had a default value of 5000 for Sequent hardware, but it has been many years since we supported that platform.) The SPINCOUNT value that will work best for any application depends on many factors, including the number of CPUs on the machine, the hardware platform, and the indvidual application. SPINCOUNT will only be useful when the machine has more than one CPU.
2) /Q logs Q_CAT:1447 after 50 unsuccessful attempts to obtain the semaphore when the semaphore has never been released and reobtained by a different process or the same process during that period. The Access Control List code uses the same rule for logging LIBTUX_CAT:1511. If TMSPINCOUNT is set, then the number of unsuccessful attempts to obtain the semaphore is incremented by 1 only after TMSPINCOUNT spins have been done.
Code for the BB semaphore and the semaphore used by /Domain follows a different rule. This code will log LIBTUX_CAT:5005 or LIBGW_CAT:5010 if a process has to wait for the semaphore for 10 seconds and the semaphore has never been released by the original owner during this time period.
3) TMSPINCOUNT is used for the BB semapahore, AOM semaphore, ACL semaphore, /Domain semaphore, and /Q semaphore. Locking the GTT uses the same BB semaphore that used to lock other tables in the BB.
Regards,
Ed

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