[Bug dap/31434] New: [gdb/dap, testsuite] Test race of cancellation with end of request

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31434

            Bug ID: 31434
           Summary: [gdb/dap, testsuite] Test race of cancellation with
                    end of request
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: dap
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

The test-case pause.exp is the only dap test-case that tests cancellation.

There are three requests cancelled:
- a continue
- a loop in gdb
- a loop in python

For all three, I think the race between cancellation and start of request is
excercised.

For the first one, the cancellation is caught by _on_stop, so the end of
request is only reached via normal return.

For the last two, since both of them hang, the end of request is only reached
through cancellation.

Consequently, the race between cancellation and end of request is currently
untested.

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