[Bug libc/31807] New: td_ta_thr_iter() doesn't allow loop detection

[jeremy.davies at gameloft dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31807

            Bug ID: 31807
           Summary: td_ta_thr_iter() doesn't allow loop detection
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: jeremy.davies at gameloft dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

As reported in https://sourceware.org/bugzilla/show_bug.cgi?id=31003, GDB uses
td_ta_thr_iter() to iterate threads found in a core file, but is encountering
circular linkage that means td_ta_thr_iter() never terminates.

td_ta_thr_iter() doesn't implement loop detection itself, and it appears that
it doesn't allow the callback function to return a value indicating that it has
detected a loop.

Perhaps a callback return code can be added that allows the callback to
indicate this condition, and which causes td_ta_thr_iter() to halt iteration
and indicate same to its caller.

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