Initial attempt to add cdef magic method to nogil extension

Cython/Compiler/Code.py

@@ -1974,6 +1974,8 @@ class CCodeWriter(object):
             elif type.is_memoryviewslice:
                 from . import MemoryView
                 self.putln("%s = %s;" % (decl, MemoryView.memslice_entry_init))
+            elif type.is_struct and type.is_extension_type and type.nogil:
+                self.putln("%s;" % decl)
             else:
                 self.putln("%s%s;" % (static and "static " or "", decl))
 

Cython/Compiler/Nodes.py

@@ -5974,6 +5974,8 @@ class DelStatNode(StatNode):
                     error(arg.pos, "Deletion of global C variable")
             elif arg.type.is_ptr and arg.type.base_type.is_cpp_class:
                 self.cpp_check(env)
+            elif arg.type.is_struct_or_union and arg.type.nogil:
+                pass # del nogil extension
             elif arg.type.is_cpp_class:
                 error(arg.pos, "Deletion of non-heap C++ object")
             elif arg.is_subscript and arg.base.type is Builtin.bytearray_type:
@@ -6002,6 +6004,8 @@ class DelStatNode(StatNode):
                 arg.generate_evaluation_code(code)
                 code.putln("delete %s;" % arg.result())
                 arg.generate_disposal_code(code)
+            elif arg.type.is_struct_or_union and hasattr(arg.type, "nogil") and arg.type.nogil:
+                code.putln("free(&%s);" % arg.result())
             # else error reported earlier
 
     def annotate(self, code):

Cython/Compiler/Symtab.py

@@ -2256,7 +2256,8 @@ class CClassScope(ClassScope):
                           cname=None, visibility='private', api=0, in_pxd=0,
                           defining=0, modifiers=(), utility_code=None, overridable=False):
         if get_special_method_signature(name) and not self.parent_type.is_builtin_type:
-            error(pos, "Special methods must be declared with 'def', not 'cdef'")
+            if not(hasattr(self.parent_type, "nogil") and self.parent_type.nogil and self.parent_type.is_struct_or_union):
+                error(pos, "Special methods must be declared with 'def', not 'cdef'")
         args = type.args
         if not type.is_static_method:
             if not args: