Ensure errno is usable in Ractor

No need to share per thread data object accross ractors.

2 files changed, 9 insertions, 1 deletions

diff --git a/ext/ffi_c/LastError.c b/ext/ffi_c/LastError.c
index 877a3d3..f4da301 100644
--- a/ext/ffi_c/LastError.c
+++ b/ext/ffi_c/LastError.c
@@ -105,7 +105,7 @@ static const rb_data_type_t thread_data_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 | FFI_RUBY_TYPED_FROZEN_SHAREABLE
+    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED
 };
 
 static ID id_thread_data;
diff --git a/spec/ffi/errno_spec.rb b/spec/ffi/errno_spec.rb
index 4170f92..c0207b8 100644
--- a/spec/ffi/errno_spec.rb
+++ b/spec/ffi/errno_spec.rb
@@ -34,4 +34,12 @@ describe "FFI.errno" do
         expect(FFI.errno).to eq(0x12345678)
     end
   end
+
+  it "works in Ractor", :ractor do
+    res = Ractor.new do
+      LibTest.setLastError(0x12345678)
+      FFI.errno
+    end.take
+    expect(res).to eq(0x12345678)
+  end
 end