Ensure that the GIL is held when releasing references to ArrowArray

objects when exported Arrow buffers are released by the consumer. In
some circumstances this could cause a segfault.

Author: anthony-tuininga

doc/src/release_notes.rst

@@ -46,6 +46,9 @@ Common Changes
       ``ArrowArray`` objects are now available in Python plugins such as those
       found in VS Code
     - Upgraded Arrow C Data (nanoarrow) API version to 0.7.0
+    - Ensure that the GIL is held when releasing references to ``ArrowArray``
+      objects when exported Arrow buffers are released by the consumer. In
+      some circumstances this could cause a segfault.
 
     Note the data frame support in python-oracledb 3.3 is a pre-release, and
     may change in a future version

src/oracledb/impl/arrow/utils.pyx

@@ -219,7 +219,8 @@ cdef int append_uint32_array(ArrowArray *arrow_array,
 
 
 cdef void arrow_buffer_dealloc_callback(ArrowBufferAllocator *allocator,
-                                        uint8_t *ptr, int64_t size):
+                                        uint8_t *ptr,
+                                        int64_t size) noexcept with gil:
     """
     ArrowBufferDeallocatorCallback for an ArrowBuffer borrowed from an Arrow
     array.