8.163 SRVPRIO (Display or set server threads process priority)

8.163.1 Function

The SRVPRIO command is used to change the priority of the server threads. See section

5.82 for details
on process and thread priorities. Given without an argument the SRVPRIO command displays the current
server threads process priority.

Caution: SRVPRIO should not have a higher dispatching priority than the TOD clock and timer thread.

8.163.2 Syntax

Descriptive

[nn]

Diagram

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nn

8.163.3 Parameter

nn

This value specifies the process priority for the server threads. For details on the
priority values see section

5.82 (“Process and Thread Priorities”).

8.163.4 Examples

Example 1:

Set the server threads process priority to 0.

HHC00013I Herc command: 'srvprio 0'

HHC02204I srvprio set to 0

Figure 296: SRVPRIO command

8.164 SSD (Signal shutdown)

8.164.1 Function

The SSD (signal shutdown) command signals an imminent hypervisor shutdown to the guest. Guests who
support this are supposed to perform a shutdown upon receiving this request.

An implicit ssd command is given on a hercules QUIT or EXIT command if the guest supports SSD. In
that case Hercules shutdown will be delayed until the guest has shutdown.

The SSD command acts different depending on how Hercules was built. If Hercules was not built with
option 'OPTION_SHUTDOWN_CONFIRMATION' (#UNDEF in file feature.h) then the command acts as
described above.

If Hercules however was built with option “OPTION_SHUTDOWN_CONFIRMATION” then a special pro-
cessing for SSD takes place.

If SSD is entered and the command level is not set to 'developer', 'debug' or 'all' then SSD first issues
message HHC02266A that prompts for confirmation by entering a second SSD command within a certain
time period (default 10 seconds) to signal the hypervisor shutdown. If the time period has expired then the
process starts over. This is to prevent an inadvertent shutdown of a running guest OS.

The time period for the second SSD command can be set to another value by using the 'QUITMOUT'
console command or configuration statement.

If the command level is set to 'developer', 'debug' or 'all' then SSD immediately signals the hypervisor
shutdown. 'SSD FORCE' also performs an immediate signal shutdown without any further checks.

8.164.2 Syntax

Descriptive

[]

Diagram

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8.164.3 Parameter

FORCE

Perform the signal shutdown immediately.

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