[Bug python/23615] New: release the GIL in execute_command

["tromey at sourceware dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23615

            Bug ID: 23615
           Summary: release the GIL in execute_command
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

This comes from
https://stackoverflow.com/questions/52098116/gdb-execute-blocks-all-the-threads-in-python-scripts

gdb.execute_command is called with the GIL and does not release it.
This means that other Python threads will be blocked by the gdb operation.

It would be better to release the GIL when re-entering gdb and
then re-acquire it when re-entering Python.

This should probably apply to parse_and_eval as well.

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