DSG - Dispatcher statistics

    CONTROL BLOCK NAME = DFHDSGDS
    NAME OF MATCHING PLS CONTROL BLOCK = DFHDSGPS
    DESCRIPTIVE NAME = CICS TS Dispatcher Statistics
           Licensed Materials - Property of IBM
            Restricted Materials of IBM 
           5655-Y04
           (C) Copyright IBM Corp. 1986, 2014 
           CICS level at which this module was last updated
    FUNCTION =
           This data area contains global statistics provided by the
           Dispatcher Domain
           It is provided for use in users monitoring applications
           to map the statistics returned via the APi or the statistics
           exit.
           There is a single instance of this data block.
    LIFETIME =
           This data block is created by the Dispatcher to store
           statistics to be passed to the user in response to a request
           to a request for statistics. The storage is released when
           the user task is detached.
           The DSECT also maps the contents of part of the SMF buffer
           created by the statistics domain and is used in the
           statistics exit.
    STORAGE CLASS =
    LOCATION =
           The user is passed a pointer to the head of the storage
           block.
    INNER CONTROL BLOCKS = none
    NOTES :
       DEPENDENCIES = S/370
       RESTRICTIONS = none
       MODULE TYPE = Domain call buffer
   ---------------------------------------------------------------------
    EXTERNAL REFERENCES = none
        DATA AREAS = none
        CONTROL BLOCKS = from dispatcher domain
        GLOBAL VARIABLES (Macro pass) = none
   ---------------------------------------------------------------------
    ALTHOUGH PROVIDED IN A GENERAL INTERFACE LIBRARY DFHDSGDS IS
    NOT TO BE USED AS A GENERAL PROGRAMMING INTERFACE. REFER TO
    PRODUCT DOCUMENTATION TO DETERMINE INTENDED USAGE.

  DSGGLEN includes the length of the (standard statistics record hdr
  of 8 bytes + DSGHDR + DSGSTATS) effectively giving the offset to
  the first entry in the TCB_MODE_STATS array.
  DSGASIZE gives the number of entries in the TCB_MODE_STATS array.
  DSGPSIZE gives the number of entries in the TCB_POOL_STATS array.

  Dispatcher Stats fields begin here.

     The following 2 fields contain the sub-dispatcher start time
  expressed in GMT and Local STCK formats respectively.

  Excess TCB Management Global Statistics.

    TCB Mode Statistics
    The stats for the Dispatcher TCB Modes are kept in a fixed length
    array. The number of entries in the array is in field DSGASIZE
    located at the begining of the DSGHDR.
    The TCB number to dispatcher mode map is as follows:
     TCB1 = Quasi Reentrant mode
     TCB2 = Resource owning mode
     TCB3 = Concurrent mode
     TCB4 = Secondary LU mode
     TCB5 = ONC/RPC mode
     TCB6 = File Owning mode
     TCB7 = Sockets Owning mode (SL)
     TCB8 = Sockets Owning mode (SO)
     TCB9 = Sockets Pthread Owning mode (SP)
     TCB10 = EP - Event Processing mode
     TCB11 = TP - Threaded TCB Owning mode
     TCB12 = D2 - DB2 mode
     TCB13 = S8 - Sockets (SSL) mode
     TCB14 = L8 - Open mode
     TCB15 = L9 - Open mode
     TCB16 = X8 - Open mode
     TCB17 = X9 - Open mode
     TCB18 = T8 - Open mode

  The following CL8 definitions are really "Store Clock" format

    TCB Pool Statistics
    The stats for the Dispatcher TCB Pools are kept in a fixed length
    array. The number of entries in the array is in field DSGPSIZE
    located at the begining of the DSGHDR.
    The TCB pool number to dispatcher pool map is as follows:
     TCB POOL(1) = MAXOPENTCBS
     TCB POOL(2) = MAXXPTCBS
     TCB POOL(3) = MAXSSLTCBS
     TCB POOL(4) = MAXTHRDTCBS

  Equates for the maximum array sizes.