SRB trace records

An SRB record represents dispatching of an asynchronous routine represented by a service request block (SRB).

Minimal Trace Record Format

SRB   ASCB.... hhhhhhhh CPU..... hhhh     
                        PSW..... hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh
                        R15..... hhhhhhhh SRB..... hhhhhhhh R1...... hhhhhhhh
                        TYPE.... ccccccccccccccccccccccccccc

Comprehensive Trace Record Format

SRB          ASCB.... hhhhhhhh CPU..... hhhh     JOBN.... cccccccc
             SRB-PSW. hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh         
             SRB..... hhhhhhhh
                        TYPE.... ccccccccccccccccccccccccccc

ASCB hhhhhhhh

Address of the ASCB for the address space in which the SRB routine is dispatched. This may or may not be the address space in which the SRB was created.

CPU hhh

Address of the processor on which the SRB routine is dispatched.

PSW hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh

SRB-PSW hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh

Program status word under which the SRB routine receives control.

JOBN cccccccc

One of the following:

cccccccc: Name of the job associated with the SRB being dispatched
N/A: Not applicable, as in the case of a global SRB, which is indicated in the TYPE field
********: An internal error occurred

SRB hhhhhhhh

One of the following:

hhhhhhhh: Address of the service request block (SRB)
********: An internal error occurred

R15 hhhhhhhh

R1hhhhhhhh

One of the following:

hhhhhhhh: Data that will appear in general registers 15 and 1 when the SRB routine is dispatched
********: An internal error occurred

PARM hhhhhhhh

One of the following:

hhhhhhhh: Four-byte parameter or the address of a parameter field to be passed to the SRB routine
N/A: Not applicable, as in the case of a suspended SRB, which is indicated in the TYPE field

TYPE ccccccccccccccccccccccccccc

Indicates the type of SRB routine, as follows:

SUSPENDED: Denotes an SRB routine that was dispatched earlier and was subsequently interrupted (for example, by I/O operations or by a request for a lock). The routine is about to be re-dispatched.
INITIAL DISPATCH OF SRB: Denotes an SRB routine selected from the service priority list that is about to be dispatched for the first time.
REDISPATCH OF SUSPENDED SRB: Denotes an SRB routine that was dispatched earlier and was subsequently interrupted (for example, by I/O operations or by a request for a lock). The routine is about to be re-dispatched.