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- ΓòÉΓòÉΓòÉ 1. About WatchDog ΓòÉΓòÉΓòÉ
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- The WatchDog application is a utility which detects a hung desktop and calls
- DosShutdown to cleanly shut the file system down and re-enable CTRL-ALT-DEL.
- The program works by registering a PM timer for a set interval. Because PM is a
- single input queue, WM_TIMER messages will not be sent when the desktop is
- hung. Another watchdog thread blocks on a semaphore with a timeout greater
- than this interval. At each WM_TIMER message, the semaphore is cleared. If
- this semaphore wait times out, the program assumes the desktop is hung. A beep
- tone will sound and after a delay, the program calls DosShutdown.
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- A legitimate (but poorly written) program might block the PM message queue
- longer than the selected timeout. To handle this case, select the Disable menu
- option before starting the program. The Watchdog program will be inactive
- until the Enable menu option is selected. There is also a selectable delay
- before shutdown that allows you to terminate the application through CTRL-ESC
- before the Watchdog application shuts the system down.
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- ΓòÉΓòÉΓòÉ 2. Help Menu ΓòÉΓòÉΓòÉ
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- Use the choices on the Help pull-down to display:
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- Help index
- Displays the index of help menu.
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- General Help
- Displays some information about Watchdog program.
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- Keys Help
- Displays a list of keys usage.
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- Using Help
- Provides detailed information on the kinds of help available and how to
- use help.
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- ΓòÉΓòÉΓòÉ 3. General Help ΓòÉΓòÉΓòÉ
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- Use this choice to get general help for the program. General help provides
- general information about the Watchdog program.
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- ΓòÉΓòÉΓòÉ 4. Extended ΓòÉΓòÉΓòÉ
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- Use this choice to obtain information on how to use the Help facility.
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- ΓòÉΓòÉΓòÉ 5. Tutorial of Keys ΓòÉΓòÉΓòÉ
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- Use this choice to see a list of keys and a description of the function of the
- keys.
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- ΓòÉΓòÉΓòÉ 5.1. Key Assigments ΓòÉΓòÉΓòÉ
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- The list of keys is arranged in groups.
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- ACCELERATOR KEYS
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- HELP KEYS
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- F1
- Get help
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- Esc
- Previous Help Panel, or End help if only one panel
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- Alt
- Switch IN/OUT action bar
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- Alt+F4
- End help or End program
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- SYSTEM KEYS
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- Alt+Esc
- Switch to the next program, including full-screen programs
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- Ctrl+Esc
- Switch to the Task List
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- WINDOW KEYS
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- Underlined letter
- Move among the choices on the action bar and pull-downs submenu or
- execut the function chosen
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- ΓòÉΓòÉΓòÉ 6. Index ΓòÉΓòÉΓòÉ
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- Use this choice to display the help index.
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- The help index lists the titles of the help information that is available.
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- ΓòÉΓòÉΓòÉ 7. Information ΓòÉΓòÉΓòÉ
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- This dialog displays information about the application, such as version number
- and copyright notice.
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- ΓòÉΓòÉΓòÉ 8. Information ΓòÉΓòÉΓòÉ
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- The OK button closes the dialog box.
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- ΓòÉΓòÉΓòÉ 9. Information ΓòÉΓòÉΓòÉ
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- Settings to control behaviour of Watchdog.
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- Heartbeat Interval
- Sets the interval between "heartbeat" (WM_TIMER) messages from OS/2. The
- minimum time period is 5 seconds. A larger value results in a slightly
- lower processor load. The largest value OS/2 can accept is 65 seconds.
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- Hang detection Interval
- Controls the delay after a missing heartbeat message before considering
- the desktop hung. Note that the total time to detect a hang can be as
- large as the sum of the Heartbeat interval and the hang detection
- interval.
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- Shutdown delay
- Time interval after detecting hang until shutdown. Allows termination of
- an application through CTRL-ESC if desktop is not really hung.
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- Play Shutdown tones
- Sound descending tones as shutdown period approaches. The first and last
- tone will always be generated.
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- Start Minimized
- Start minimized by default.
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- Ok
- Accept new settings
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- Save
- Accept new settings and save them to disk
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- Cancel
- Abandon all changes made to this screen.
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- Help
- Display this help screen
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- ΓòÉΓòÉΓòÉ 10. Information ΓòÉΓòÉΓòÉ
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- This key will enable the "hang detection" in the Watchdog program.
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- ΓòÉΓòÉΓòÉ 11. Information ΓòÉΓòÉΓòÉ
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- This key will temporarily disable the "hang detection" in the Watchdog program
- until ENABLE is selected.
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- ΓòÉΓòÉΓòÉ 12. Information ΓòÉΓòÉΓòÉ
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- This dialog displays the user settings for the Watchdog program
- characteristics.