[Info-vax] The PWAIT tool.

[IanMiller]

On 2 Oct, 07:17, Volker Halle <volker_ha... at hotmail.com> wrote:
> Jan-Erik,
>
> you should also consider the following.
>
> If a process OWNs a MUTEX, it should be executing at priority 16 (as
> seen with SDA> SHOW SUMM in column Pri) and should also have a Mutex
> Count > 0 (seen with SDA> SHOW PROC in the Thread index page). PWAIT
> $SDA is supposed to try and find that information for you !
>
> If you can't find such a process in your system, it is even less
> likely, that this is a real MUTEX wait situation, also considering the
> fact, that the data present at that 'MUTEX' address does NOT look like
> a MUTEX !
>
> If you are interested in helping Ian or me to increase the usefulness
> of PWAIT$SDA, consider to force a crash and make the dump available
> for analysis.
>
> Volker.


Note that PWAIT does attempt to look for a process owning a mutex, and
would of displayed it if it found one. So it could be that PWAIT
interpretation of the data that resulting in the message about it
waiting for a MUTEX  may be well be faulty i.e. PWAIT$SDA has a bug.
Catching a process waiting for MUTEX are not that common.