check multi_ractor mode at main_p

rb_ractor_main_p() need to access to the ractor pointer in TLS.
However it is slow operation so that we need to skip this check
if it is not multi-ractor mode (!ruby_multi_ractor).

This performance regression is pointed at
https://bugs.ruby-lang.org/issues/17100#note-27

1 files changed, 1 insertions, 2 deletions

diff --git a/vm_sync.h b/vm_sync.h
index e9cc274bb8..f601143416 100644
--- a/vm_sync.h
+++ b/vm_sync.h
@@ -4,6 +4,7 @@
 
 #include "vm_core.h"
 #include "vm_debug.h"
+#include "ractor_pub.h"
 
 #if USE_RUBY_DEBUG_LOG
 #define LOCATION_ARGS const char *file, int line
@@ -26,8 +27,6 @@ void rb_vm_barrier(void);
 void rb_vm_cond_wait(rb_vm_t *vm, rb_nativethread_cond_t *cond);
 void rb_vm_cond_timedwait(rb_vm_t *vm, rb_nativethread_cond_t *cond, unsigned long msec);
 
-extern bool ruby_multi_ractor;
-
 static inline bool
 rb_multi_ractor_p(void)
 {