Freeze immutable objects and add explicit make_shareable to make library definitions Ractor usable

Freeze objects which are immutable from the start are now freezed.
This allows these objects to be used by Ractor without make_shareable.

This partially reverts commit 4fc6a8c5ec8a9a720330946af9d1103015c62942 in such a way, that functions are stored in a module variable @ffi_functions.
Enums are implemented per FFI::Library not per attached function.
To make them shareable they would have to be copied and freezed per function.
This would increase memory footprint for the sake of Ractor support.

IMHO it's better to mark the module explicit as finished by .freeze to allow its use in a Ractor.
This also enables querying the enum definitions from a Ractor.

Using a Hash instead of per-function variables allow to use foo! and bar? methods as wished in #971.

Fixes #971

1 files changed, 4 insertions, 3 deletions

diff --git a/lib/ffi/variadic.rb b/lib/ffi/variadic.rb
index 800d121..246b52f 100644
--- a/lib/ffi/variadic.rb
+++ b/lib/ffi/variadic.rb
@@ -54,11 +54,12 @@ module FFI
       invoker = self
       params = "*args"
       call = "call"
-      mod.module_eval <<-code
-        @ffi_function_#{mname} = invoker
+      mod.module_eval <<-code, __FILE__, __LINE__
+        @ffi_functions = {} unless defined?(@ffi_functions)
+        @ffi_functions[#{mname.inspect}] = invoker
 
         def self.#{mname}(#{params})
-          @ffi_function_#{mname}.#{call}(#{params})
+          @ffi_functions[#{mname.inspect}].#{call}(#{params})
         end
 
         define_method(#{mname.inspect}, &method(:#{mname}))