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Documented upstream in: https://bugzilla.quagga.net/show_bug.cgi?id=1011
The included patches will remedy thread.c shortcomings and add proper safeguards
to detect future thread handling errors.
fixes in the patches:
- add a name to a thread for error messages
- add a list pointer to the thread to track list membership
- add fast check on prev/next pointer invariants
- add check to detect inserting of a thread already in a list
- add check to detect deletion of a thread not in a list
- ignore cancellation requests for the currently running thread (fixes crash)
- fix setting of prey/next pointers on adjecant elements when a head/tail element is
deleted
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