PPT Slide

Thread Characteristics:

• Thread has its own PIN

• Thread has its own stack

• Thread shares SR5 space

• Runtime Control Block (DBUX/DBU)

  • One per DBOPEN
  • transaction information
  • locking information
  • logging information
  • current record pointers
  • opened files
  • trailer area

• Global Variables

  • qlock_trace
  • bti_global
  • ccu_global
  • chunk_control

• Open Files

  • except rootfile, not using file system intrinsics
  • maintain own current record pointers
  • use SMCB

Problems for not being thread safe:

• Runtime control block

• Global variables

• Open files

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