# Hercules Version 3: System Messages: TT - TOD Clock and Timer Services

This page describes the TOD Clock and Timer Services messages for the Hercules S/370, ESA/390, and z/Architecture emulator.

### Messages

`HHCTT001W Timer thread set priority priority failed: error`
  Meaning
    An attempt to change the priority of the timer thread to `priority` failed. The error is described by `error`. The thread priority has not been changed. Hercules overall performance may be impaired as a result.
  Action
    If performance problems are noted, correct the error and restart Hercules.
  Issued by
    timer.c, function timer_update_thread
`HHCTT002I Timer thread started: tid=threadid, pid=processid, priority=priority`
  Meaning
    The thread for timing functions has been started. Its thread id is `threadid`, its process id is `processid` and the thread priority is `priority`.
  Issued by
    timer.c, function timer_update_thread
`HHCTT003I Timer thread ended`
  Meaning
    The thread for timing functions has ended.
  Issued by
    timer.c, function timer_update_thread

If you have a question about Hercules, see the Hercules Frequently-Asked Questions page.

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