[Bug gdb/29854] New: ^C should interrupt synchronous wait on cooked index completion

["simon.marchi at polymtl dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29854

            Bug ID: 29854
           Summary: ^C should interrupt synchronous wait on cooked index
                    completion
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: simon.marchi at polymtl dot ca
  Target Milestone: ---

Using commit 09a5d200e6166522e0d0a9276bd6b2227ac5ace1, I do:

$ ./gdb -nx -q --data-directory=data-directory
testsuite/outputs/gdb.gdb/selftest/xgdb
Reading symbols from testsuite/outputs/gdb.gdb/selftest/xgdb...
(gdb) b captured_main
^C

Creating the breakpoint takes some time, doing ^C does nothing.  Attaching to
GDB, I understood that it's because the main thread is waiting on the
`table->wait ()` call, waiting for worker threads to finish building the cooked
indices.  Not sure how we can do it, but it would be nice for ^C to interrupt
that table->wait call and generate a gdb_exception_quit.

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