Author: Matt Deatherage
Year: 1989
... lists changes to the description for ClrHeartBeat.
Apple II
Technical Notes
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Developer Technical Support
Apple IIGS
#55: Avoiding ClrHeartBeat
Written by: Matt Deatherage July 1989
This Technical Note lists changes to the description for ClrHeartBeat. This
information supersedes the description in the Apple IIGS Toolbox Reference
Manual.
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The Apple IIGS Toolbox Reference Manual gives the following cautionary note in
the description for the call ClrHeartBeat:
"A desk accessory may have installed tasks in the Heartbeat
Interrupt Task queue. If you make a ClrHeartBeat call, you will
remove those tasks. Therefore, under normal circumstances you
should not make this call."
This isn't rude enough to get the point across to some people, so we'll try
again:
The Heartbeat Interrupt Task queue does not belong to the application.
Different portions of System Software can, and will, install Heartbeat Tasks.
If these tasks are removed, anything from a system crash to media corruption
may result. Nothing but System Software should make this call.
Further Reference
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o Apple IIGS Toolbox Reference Manual