From 1689cc0fa2eba174ec66bffa5d8f1656760c6702 Mon Sep 17 00:00:00 2001
From: Lars Kanis <lars@greiz-reinsdorf.de>
Date: Tue, 18 Apr 2023 15:06:15 +0200
Subject: Fix compat to JRuby and TuffleRuby regarding Ractor

---
 lib/ffi/types.rb               | 11 ++++++++++-
 spec/ffi/memorypointer_spec.rb |  4 ++++
 spec/ffi/pointer_spec.rb       |  2 ++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/lib/ffi/types.rb b/lib/ffi/types.rb
index da214ee..8f5d897 100644
--- a/lib/ffi/types.rb
+++ b/lib/ffi/types.rb
@@ -33,6 +33,15 @@
 # see {file:README}
 module FFI
 
+  unless defined?(self.custom_typedefs)
+    # Truffleruby and JRuby don't support Ractor so far.
+    # So they don't need separation between builtin and custom types.
+    def self.custom_typedefs
+      TypeDefs
+    end
+    writable_typemap = true
+  end
+
   # @param [Type, DataConverter, Symbol] old type definition used by {FFI.find_type}
   # @param [Symbol] add new type definition's name to add
   # @return [Type]
@@ -206,5 +215,5 @@ module FFI
   rescue Errno::ENOENT
   end
 
-  FFI.make_shareable(TypeDefs)
+  FFI.make_shareable(TypeDefs) unless writable_typemap
 end
diff --git a/spec/ffi/memorypointer_spec.rb b/spec/ffi/memorypointer_spec.rb
index 904fdc9..f29e2cb 100644
--- a/spec/ffi/memorypointer_spec.rb
+++ b/spec/ffi/memorypointer_spec.rb
@@ -37,6 +37,8 @@ describe "MemoryPointer#clear" do
     expect(ptr.read_long).to eq(0)
   end
   it "should deny changes when frozen" do
+    skip "not yet supported on TruffleRuby" if RUBY_ENGINE == "truffleruby"
+    skip "not yet supported on JRuby" if RUBY_ENGINE == "jruby"
     ptr = MemoryPointer.new(:long).freeze
     expect{ ptr.clear }.to raise_error(RuntimeError, /memory write/)
   end
@@ -102,6 +104,8 @@ describe "#autorelease" do
   end
 
   it "should deny changes when frozen" do
+    skip "not yet supported on TruffleRuby" if RUBY_ENGINE == "truffleruby"
+    skip "not yet supported on JRuby" if RUBY_ENGINE == "jruby"
     ptr = MemoryPointer.new(8).freeze
     expect{ ptr.autorelease = false }.to raise_error(FrozenError)
   end
diff --git a/spec/ffi/pointer_spec.rb b/spec/ffi/pointer_spec.rb
index 7232a5f..880ffd3 100644
--- a/spec/ffi/pointer_spec.rb
+++ b/spec/ffi/pointer_spec.rb
@@ -91,6 +91,8 @@ describe "Pointer" do
     end
 
     it "#write_pointer frozen object" do
+      skip "not yet supported on TruffleRuby" if RUBY_ENGINE == "truffleruby"
+      skip "not yet supported on JRuby" if RUBY_ENGINE == "jruby"
       memory = FFI::MemoryPointer.new(:pointer).freeze
       expect{ memory.write_pointer(PointerTestLib.ptr_from_address(0xdeadbeef)) }.to raise_error(RuntimeError, /memory write/)
     end
-- 
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