DCD

Prolog  

Control Block Contents  
   DCD DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

DCD Prolog

 NAME       : STRUCPRA
 DSECT      : DCD
 DESCRIPTION: Dispatch Class Descriptor
 FUNCTION   : Describes a set of threads wherein only one
              may run at a time and wherein control loss
              among the members in the set is always
              voluntary

DCD Control Block Content

DCD DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      DCD            Dispatch Class Descriptor
0000    0 Dbl-Word     8 * (0)
0000    0 Address      4 DCD_NEXT       next DCD
0004    4 Address      4 DCD_PREV       previous DCD
0008    8 Address      4 DCD_RLTSD      TSD on run list
000C   12 Signed       4 *              Reserved
0010   16 Character   16 DCD_TSDLIST    TSDs in class
          00000198       DCD_SIZE       *-DCD
     kernel run-time anchor block (one per thread)

DCD Storage Layout

          
*** DCD - Dispatch Class Descriptor
*
*     +---------------------------+---------------------------+
*   0 |         DCD_NEXT          |         DCD_PREV          |
*     +---------------------------+---------------------------+
*   8 |        DCD_RLTSD          |///////////////////////////|
*     +---------------------------+---------------------------+
*  10 |                     DCD_TSDLIST                       |
*     |                                                       |
*     +-------------------------------------------------------+
*  20
*
*** DCD - Dispatch Class Descriptor

DCD Cross Reference

Symbol         Dspl Value
-------------- ---- -----
DCD_NEXT       0000
DCD_PREV       0004
DCD_RLTSD      0008
DCD_SIZE       0010 00000198
DCD_TSDLIST    0010