Add support for using FFI in Ractor

All objects are shareable now when frozen.
All objects can be created in a non-main Ractor.

Typedefs are a global mutable state and are not accessable from Ractor other than the main Ractor.
So all Function, Struct, etc. must be defined in the main Ractor and can then be used in other Ractors.

1 files changed, 17 insertions, 1 deletions

diff --git a/ext/ffi_c/AbstractMemory.c b/ext/ffi_c/AbstractMemory.c
index 3cf16a7..3b076bb 100644
--- a/ext/ffi_c/AbstractMemory.c
+++ b/ext/ffi_c/AbstractMemory.c
@@ -70,7 +70,7 @@ const rb_data_type_t rbffi_abstract_memory_data_type = { /* extern */
     },
     // 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 size_t
@@ -316,6 +316,7 @@ static VALUE
 memory_clear(VALUE self)
 {
     AbstractMemory* ptr = MEMORY(self);
+    checkWrite(ptr);
     memset(ptr->address, 0, ptr->size);
     return self;
 }
@@ -687,6 +688,20 @@ memory_copy_from(VALUE self, VALUE rbsrc, VALUE rblen)
     return self;
 }
 
+/*
+ * call-seq:
+ *    res.freeze
+ *
+ * Freeze the AbstractMemory object and unset the writable flag.
+ */
+static VALUE
+memory_freeze(VALUE self)
+{
+    AbstractMemory* ptr = MEMORY(self);
+    ptr->flags &= ~MEM_WR;
+    return rb_call_super(0, NULL);
+}
+
 AbstractMemory*
 rbffi_AbstractMemory_Cast(VALUE obj, const rb_data_type_t *data_type)
 {
@@ -1102,6 +1117,7 @@ rbffi_AbstractMemory_Init(VALUE moduleFFI)
     rb_define_method(classMemory, "type_size", memory_type_size, 0);
     rb_define_method(classMemory, "[]", memory_aref, 1);
     rb_define_method(classMemory, "__copy_from__", memory_copy_from, 2);
+    rb_define_method(classMemory, "freeze", memory_freeze, 0 );
 
     id_to_ptr = rb_intern("to_ptr");
     id_call = rb_intern("call");