expose some C-APIs for ractor

expose some C-APIs to try to make ractor utilities on external gems.

* add
  * rb_ractor_local_storage_value_lookup() to check availability
* expose
  * rb_ractor_make_shareable()
  * rb_ractor_make_shareable_copy()
  * rb_proc_isolate() (not public)
  * rb_proc_isolate_bang() (not public)
  * rb_proc_ractor_make_shareable() (not public)

1 files changed, 11 insertions, 0 deletions

diff --git a/ractor.c b/ractor.c
index d9a8e07a79..420b2051b2 100644
--- a/ractor.c
+++ b/ractor.c
@@ -3128,6 +3128,17 @@ rb_ractor_local_storage_value(rb_ractor_local_key_t key)
     }
 }
 
+bool
+rb_ractor_local_storage_value_lookup(rb_ractor_local_key_t key, VALUE *val)
+{
+    if (ractor_local_ref(key, (void **)val)) {
+        return true;
+    }
+    else {
+        return false;
+    }
+}
+
 void
 rb_ractor_local_storage_value_set(rb_ractor_local_key_t key, VALUE val)
 {