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watchdog
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watchdog.hlp
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OS/2 Help File
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1994-02-04
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6KB
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162 lines
ΓòÉΓòÉΓòÉ 1. About WatchDog ΓòÉΓòÉΓòÉ
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.
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.
ΓòÉΓòÉΓòÉ 2. Help Menu ΓòÉΓòÉΓòÉ
Use the choices on the Help pull-down to display:
Help index
Displays the index of help menu.
General Help
Displays some information about Watchdog program.
Keys Help
Displays a list of keys usage.
Using Help
Provides detailed information on the kinds of help available and how to
use help.
ΓòÉΓòÉΓòÉ 3. General Help ΓòÉΓòÉΓòÉ
Use this choice to get general help for the program. General help provides
general information about the Watchdog program.
ΓòÉΓòÉΓòÉ 4. Extended ΓòÉΓòÉΓòÉ
Use this choice to obtain information on how to use the Help facility.
ΓòÉΓòÉΓòÉ 5. Tutorial of Keys ΓòÉΓòÉΓòÉ
Use this choice to see a list of keys and a description of the function of the
keys.
ΓòÉΓòÉΓòÉ 5.1. Key Assigments ΓòÉΓòÉΓòÉ
The list of keys is arranged in groups.
ACCELERATOR KEYS
HELP KEYS
F1
Get help
Esc
Previous Help Panel, or End help if only one panel
Alt
Switch IN/OUT action bar
Alt+F4
End help or End program
SYSTEM KEYS
Alt+Esc
Switch to the next program, including full-screen programs
Ctrl+Esc
Switch to the Task List
WINDOW KEYS
Underlined letter
Move among the choices on the action bar and pull-downs submenu or
execut the function chosen
ΓòÉΓòÉΓòÉ 6. Index ΓòÉΓòÉΓòÉ
Use this choice to display the help index.
The help index lists the titles of the help information that is available.
ΓòÉΓòÉΓòÉ 7. Information ΓòÉΓòÉΓòÉ
This dialog displays information about the application, such as version number
and copyright notice.
ΓòÉΓòÉΓòÉ 8. Information ΓòÉΓòÉΓòÉ
The OK button closes the dialog box.
ΓòÉΓòÉΓòÉ 9. Information ΓòÉΓòÉΓòÉ
Settings to control behaviour of Watchdog.
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.
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.
Shutdown delay
Time interval after detecting hang until shutdown. Allows termination of
an application through CTRL-ESC if desktop is not really hung.
Play Shutdown tones
Sound descending tones as shutdown period approaches. The first and last
tone will always be generated.
Start Minimized
Start minimized by default.
Ok
Accept new settings
Save
Accept new settings and save them to disk
Cancel
Abandon all changes made to this screen.
Help
Display this help screen
ΓòÉΓòÉΓòÉ 10. Information ΓòÉΓòÉΓòÉ
This key will enable the "hang detection" in the Watchdog program.
ΓòÉΓòÉΓòÉ 11. Information ΓòÉΓòÉΓòÉ
This key will temporarily disable the "hang detection" in the Watchdog program
until ENABLE is selected.
ΓòÉΓòÉΓòÉ 12. Information ΓòÉΓòÉΓòÉ
This dialog displays the user settings for the Watchdog program
characteristics.