1 files changed, 7 insertions, 4 deletions

diff --git a/ext/ffi_c/DynamicLibrary.c b/ext/ffi_c/DynamicLibrary.c
index bcbc8de..9096e74 100644
--- a/ext/ffi_c/DynamicLibrary.c
+++ b/ext/ffi_c/DynamicLibrary.c
@@ -73,7 +73,7 @@ static const rb_data_type_t rbffi_library_data_type = {
     },
     // IMPORTANT: WB_PROTECTED objects must only use the RB_OBJ_WRITE()
     // macro to update VALUE references, as to trigger write barriers.
-    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED
+    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED | FFI_RUBY_TYPED_FROZEN_SHAREABLE
 };
 
 static const rb_data_type_t library_symbol_data_type = {
@@ -87,7 +87,7 @@ static const rb_data_type_t library_symbol_data_type = {
     .parent = &rbffi_pointer_data_type,
     // IMPORTANT: WB_PROTECTED objects must only use the RB_OBJ_WRITE()
     // macro to update VALUE references, as to trigger write barriers.
-    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED
+    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED | FFI_RUBY_TYPED_FROZEN_SHAREABLE
 };
 
 static VALUE LibraryClass = Qnil, SymbolClass = Qnil;
@@ -161,7 +161,9 @@ library_initialize(VALUE self, VALUE libname, VALUE libflags)
         library->handle = RTLD_DEFAULT;
     }
 #endif
-    rb_iv_set(self, "@name", libname != Qnil ? libname : rb_str_new2("[current process]"));
+    rb_iv_set(self, "@name", libname != Qnil ? rb_str_new_frozen(libname) : rb_str_new2("[current process]"));
+
+    rb_obj_freeze(self);
     return self;
 }
 
@@ -277,8 +279,9 @@ symbol_new(VALUE library, void* address, VALUE name)
     sym->base.memory.typeSize = 1;
     sym->base.memory.flags = MEM_RD | MEM_WR;
     RB_OBJ_WRITE(obj, &sym->base.rbParent, library);
-    RB_OBJ_WRITE(obj, &sym->name, name);
+    RB_OBJ_WRITE(obj, &sym->name, rb_str_new_frozen(name));
 
+    rb_obj_freeze(obj);
     return obj;
 }