Latch manager trace entries

The sub functions GET, GETU, REL, and RCOV are listed.

Sub Function: X'01' Get latch (GET)

Sub Function: X'01' Get latch (GET)
Description:  Get a latch
     word   1  -- Caller's SAP address
     word   2  -- Latch name
     word   3  -- Caller's return address
     word   4  -- Resource header address
     word   5  -- 1st halfword = latch level;
                  2nd halfword = flags from latch manager parmlist                          
     word  6/7 -- 8-byte STCK value

Sub Function: X'02' - Upgrade latch (GETU)

Sub Function: X'02' - Upgrade latch (GETU)
Description:  Upgrade a latch from shared to exclusive
     word   1  -- Caller's SAP address
     word   2  -- Latch name
     word   3  -- Caller's return address
     word   4  -- Resource header address
     word   5  -- 1st halfword = latch level;
                  2nd halfword = flags from latch manager parmlist
     word  6/7 -- 8-byte STCK value

Sub Function: X'03' - Release latch (REL)

Sub Function: X'03' - Release latch (REL)
Description:  Release a latch
     word   1  -- Caller's SAP address
     word   2  -- Latch name
     word   3  -- Caller's return address
     word   4  -- Resource header address
     word   5  -- 1st halfword = latch level;
                  2nd halfword = flags from latch manager parmlist
     word  6/7 -- 8-byte STCK value

Sub Function: X'04' - Recover latch (RCOV)

Sub Function: X'04' - Recover latch (RCOV)
Description:  Recover a latch
     word   1  -- SAP, TCB, or ASCB address
     word   2  -- Latch name
     word   3  -- Caller's return address
     word   4  -- 0
     word   5  -- 1st halfword = latch level;
                  2nd halfword = flags from latch manager parmlist
     word  6/7 -- 8-byte STCK value