Module openj9.dtfj
Package com.ibm.dtfj.corereaders.zos.mvs

Class Tcb

java.lang.Object
com.ibm.dtfj.corereaders.zos.mvs.Tcb
public class Tcb extends Object
This class represents an MVS Task Control Block (TCB). Methods that begin with "tcb" return the value of fields as defined in the IKJTCB macro.

  • Constructor Details

    • Tcb

      public Tcb(AddressSpace space, long address)
      Create a new Tcb for the given address space.
      Parameters:
      space - the AddressSpace to which this Tcb belongs
      address - the address of this Tcb

  • Method Details

    • getTcbs

      public static Tcb[] getTcbs(AddressSpace space)
      Returns an array containing all of the Tcbs in the given AddressSpace. Returns null if this address space contains no Tcbs.

    • address

      public long address()
      Returns the address of this Tcb

    • space

      public AddressSpace space()
      Returns the AddressSpace we belong to

    • tcbcelap

      public long tcbcelap() throws IOException
      Return the celap pointer for this Tcb.
      Throws:
      IOException - if an error occurred reading from the address space

    • tcbrtwa

      public long tcbrtwa() throws IOException
      Return the rtwa pointer for this Tcb.
      Throws:
      IOException - if an error occurred reading from the address space

    • tcbrbp

      public long tcbrbp() throws IOException
      Return the rbp pointer for this Tcb.
      Throws:
      IOException - if an error occurred reading from the address space

    • tcbstcb

      public long tcbstcb() throws IOException
      Return the stcb pointer for this Tcb.
      Throws:
      IOException - if an error occurred reading from the address space

    • tcbtcb

      public long tcbtcb() throws IOException
      Return the pointer to the next Tcb in the queue
      Throws:
      IOException - if an error occurred reading from the address space

    • getRegisters

      public RegisterSet getRegisters() throws IOException
      Get registers from the TCB itself. The registers are in the TCB and the PSW comes from the RB.
      Throws:
      IOException

    • getRegistersFromBPXGMSTA

      public RegisterSet getRegistersFromBPXGMSTA() throws IOException
      Try and get the registers by simulating the BPXGMSTA service. (XXX I think this is probably the best place to implement this kernel call?)
      Throws:
      IOException

    • getLinkageStack

      public Lse[] getLinkageStack() throws IOException
      Return the linkage stack as an array of Lse entries. The length of the array will be zero if the linkage stack is empty. The top of the stack (as represented by stcblsdp) is the first element in the array and the end of the stack (also sometimes referred to as the first entry, aka stcbestk) is the last element in the array.
      Throws:
      IOException