Re: Mutex state?!

IIRC, VMS had mutex waits as early as V3.0 & possibly sooner. FWIW - My 1st VMS sysupgrade was in July 1979 to V1.4

MUTEX - Stands for MUTual EXclusion semaphore. a MUTEX is a simply a bit flag in memory which is used to signal whether or not some process is changing the state of some critical VMS internal data structure.

A MUTEX wait occurs when process B is waiting on a MUTEX while process A "owns the lock". In an idea world, you should actually see a Mutex Wait rarely, if ever. The fact is recurring or frequent MUTEX Waits indicates some serious resource bottleneck.

HTH & YMMV! pjm4_at_staffs.ac.uk (pjm) wrote in news:3bb070b8.76498539_at_news.staffs.ac.uk:

> Err, thanks (I think!) - I am a seriously novice VMS users, wanted to
> know really _what_ a mutex state is/means - and what could possibly
> cause it
>
> Thanks!
>
> On Tue, 25 Sep 2001 15:41:00 +0400, "Ruslan R. Laishev"

><Laishev_at_SMTP.DeltaTel.RU> wrote:

>>
>>
>>pjm4 wrote:
>>> 
>>> Could anyone please inform me as to what a mutex state means in
>>> relation to running oracle 8 under VMS - cheers! 
>>$sho proc ...
>>get PID
>>$anal/ system
>>SDA>
>>SDA>set process/id=<pid>
>>SDA>pthread mutex
>>...
>>
>>
>>-- 
>>Cheers,
>>+OpenVMS [Sys|Net] HardWorker........................................+
>> Russia,Delta Telecom Inc,                    Cel:  +7 (901) 971-3222
>> 191119,St.Petersburg,Transportny per. 3                     116-3222
>> +http://www.levitte.org/~rlaishev/ .......... SysMan rides HailStorm +