From f0d0c030c04c1c3949ac85a37b7d4bf8acebface Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Tue, 5 Nov 2024 03:57:48 +0900
Subject: [PATCH] `Ractor.main?`

to return the current ractor is the main ractor.
(== `Ractor.current == Ractor.main`)
---
 ractor.rb | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ractor.rb b/ractor.rb
index d18062ca07..6a83d3a92f 100644
--- a/ractor.rb
+++ b/ractor.rb
@@ -850,4 +850,11 @@ class Ractor
       rb_ractor_self(GET_VM()->ractor.main_ractor);
     }
   end
+
+  # return true if the current ractor is main ractor
+  def self.main?
+    __builtin_cexpr! %q{
+      GET_VM()->ractor.main_ractor == rb_ec_ractor_ptr(ec)
+    }
+  end
 end