tree de4dfc67182ebf341a5be334c1c345379b5c2092
parent 7ae9ecfd80104a793ed1d836fd4dc0aa1a9c7832
author Andrew Burgess <aburgess@redhat.com> 1701878231 +0100
committer Alexandra Hájková <ahajkova@redhat.com> 1702460804 +0100

gdb/python: avoid use of _PyOS_ReadlineTState

In python/py-gdb-readline.c we make use of _PyOS_ReadlineTState,
however, this variable is no longer public in Python 3.13, and so GDB
no longer builds.

We are making use of _PyOS_ReadlineTState in order to re-acquire the
Python Global Interpreter Lock (GIL).  The _PyOS_ReadlineTState
variable is set in Python's outer readline code prior to calling the
user (GDB) supplied readline callback function, which for us is
gdbpy_readline_wrapper.  The gdbpy_readline_wrapper function is called
without the GIL held.

Instead of using _PyOS_ReadlineTState, I propose that we switch to
calling PyGILState_Ensure() and PyGILState_Release().  These functions
will acquire the GIL based on the current thread.  I think this should
be sufficient; I can't imagine why we'd be running
gdbpy_readline_wrapper on one thread on behalf of a different Python
thread.... that would be unexpected I think.

Approved-By: Tom Tromey <tom@tromey.com>