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bind/doc/design/tasks
David Lawrence 03f727fcc5 Notes from Bob to bind-dev about tasks (shutdown and termination).
This is the start of what I hope will grow to be more descriptive
documentation of usage of the ISC task/event library.
2000-01-31 15:12:41 +00:00

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Changes I made last week to the task code simplified the task shutdown
and termination model. Here's how things now work:
When a task is shutdown:
Any "on shutdown" events for the task are posted
The "shutting down" attribute of the task is set
Any attempts to add shutdown events with isc_task_onshutdown()
will fail, since the task is already shutting down
Task shutdown can be initiated explicity, via a call to isc_task_shutdown(),
or implicitly, when the following conditions occur:
The "shutting down" attribute of the task is not set
The task has no references
The task has an empty event queue
Task termination occurs when:
The "shutting down" attribute of the task is set
The task has no references
The task has an empty event queue