Andrew Burgess 8170efad36 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>

2023-12-13 10:46:44 +01:00

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