Thread Diagnostics - Wait Time

Shown above is an example of how the shell can display the threads that have the highest wait time, ie:- the length of time that they are blocked from running.

This type of data is an invaluable aid to fault finding.

Key to the columns -

• INDEX

  The index showing where this thread can be found in the thread table.

• NAME

  The unique name of the thread in the thread table.

• CON

  The current condition of this thread.
  As you would expect the top seven threads are all waiting for a specific event.
  
  • 'P' - waiting on read from a pipe from another process
  • 'S' - waiting on read from a socket from another system
  • 'T' - waiting for a timer to expire
  • 'I' - waiting for input to be entered on the keyboard
  • '*' - waiting to run by the multi-threader shell
  • '-' - Currently idle (not waiting or running)

• STA

  The current state that this thread is processing.

• BLO

  The number of dynamic data blocks that this thread currently owns.
  A thread may only own three blocks (unless it specifically requests more).

• TIM

  The number of outstanding timers that this thread currently owns.

• RUN

  The length of time, in seconds, that this thread has run since the process was started.

• WAIT

  The length of time, in seconds, that this thread has been blocked from running since the process was started.