THRBK Back to Index page
 
Prolog 
Control Block Contents 
   THRBK DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  THRBK Prolog Top of page
 
 NAME       : HCPTHRBK
 DESCRIPTION: Throttle Control Block
 DSECT      : THRBK
 FUNCTION   : The Throttle Control Block is used to control the rate at
              which I/O operations are permitted to occur for devices
              under the control of the Throttle Facility.
 LOCATED BY :
              SYSTHRPR Anchor in HCPSYSCM
              RDEVTHPT Anchor in HCPRDEV
 CREATED BY : THRBK'S are dynamically created by HCPTHR via the
              "SET THROTTLE ON" command.
 DELETED BY : THRBK'S are deleted by HCPTHR via:
              1- The "SET THROTTLE OFF" command
              2- The "SET THROTTLE CLEAR" command
              3- The "DETACH" command
 RELOCATION CONSIDERATIONS : None
 
 
  THRBK Control Block Content Top of page
 

 THRBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure THRBK Throttle Control Block 0000 0 Signed 4 THRNEXT Pointer to next THRBK in the chain 0004 4 Signed 4 THRPREV Pointer to previous THRBK in the chain 0008 8 Dbl-Word 8 THRTGTTM Target time for this device (TOD format) Updated at time of last I/O to device 0010 16 Signed 4 THRRDEV Pointer to RDEV for device 0014 20 Signed 4 THRDLYS Count of times I/O delayed for device 0018 24 Bitstring 2 THRDEVNO Device number 001A 26 Bitstring 2 * Reserved 001C 28 Signed 4 THRRTEBN Current rate in binary 0020 32 Dbl-Word 8 THRIORTE I/O rate for the device 0028 40 Dbl-Word 8 * (2) Reserved 0038 56 Dbl-Word 8 THR$END (0) End of THRBK 00000007 THRSIZE (*-THRBK+7)/8 THRBK size in double words
 
 
  THRBK Storage Layout Top of page
 
          
*** THRBK - Throttle Control Block
*
*     +---------------------------+---------------------------+
*   0 |         THRNEXT           |         THRPREV           |
*     +---------------------------+---------------------------+
*   8 |                       THRTGTTM                        |
*     +---------------------------+---------------------------+
*  10 |         THRRDEV           |         THRDLYS           |
*     +-------------+-------------+---------------------------+
*  18 |  THRDEVNO   |/////////////|         THRRTEBN          |
*     +-------------+-------------+---------------------------+
*  20 |                       THRIORTE                        |
*     +-------------------------------------------------------+
*  28 |///////////////////////////////////////////////////////|
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*
*** THRBK - Throttle Control Block
 
 
  THRBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
THR$END        0038
THRDEVNO       0018
THRDLYS        0014
THRIORTE       0020
THRNEXT        0000
THRPREV        0004
THRRDEV        0010
THRRTEBN       001C
THRSIZE        0038 00000007
THRTGTTM       0008
 
This information is based on z/VM 7.1.0 Last updated on 22 Jun 2018 at 11:53:20 EDT.
Copyright IBM Corporation, 1990, 2018