ruby_single_main_ractor for single ractor mode

ruby_multi_ractor was a flag that indicates the interpreter doesn't
make any additional ractors (single ractor mode).
Instead of boolean flag, ruby_single_main_ractor pointer is introduced
which keeps main ractor's pointer if single ractor mode. If additional
ractors are created, ruby_single_main_ractor becomes NULL.

1 files changed, 9 insertions, 2 deletions

diff --git a/vm_core.h b/vm_core.h
index 5ddd7b4b4f..6b975ac3ef 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -1799,11 +1799,18 @@ rb_current_thread(void)
     return rb_ec_thread_ptr(ec);
 }
 
+extern struct rb_ractor_struct *ruby_single_main_ractor; // ractor.c
+
 static inline rb_ractor_t *
 rb_current_ractor(void)
 {
-    const rb_execution_context_t *ec = GET_EC();
-    return rb_ec_ractor_ptr(ec);
+    if (ruby_single_main_ractor) {
+        return ruby_single_main_ractor;
+    }
+    else {
+        const rb_execution_context_t *ec = GET_EC();
+        return rb_ec_ractor_ptr(ec);
+    }
 }
 
 static inline rb_vm_t *