From 983f6d0f2af157ce2df9428a1701d8666877d0f5 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sun, 7 Mar 2021 10:24:03 +0900
Subject: Moved locking VM to an atomic operation

---
 ractor.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

(limited to 'ractor.c')

diff --git a/ractor.c b/ractor.c
index 4cb7b5ad49..36898dbf1e 100644
--- a/ractor.c
+++ b/ractor.c
@@ -290,7 +290,7 @@ RACTOR_PTR(VALUE self)
     return r;
 }
 
-static uint32_t ractor_last_id;
+static rb_atomic_t ractor_last_id;
 
 #if RACTOR_CHECK_MODE > 0
 MJIT_FUNC_EXPORTED uint32_t
@@ -1399,11 +1399,7 @@ ractor_next_id(void)
 {
     uint32_t id;
 
-    RB_VM_LOCK();
-    {
-        id = ++ractor_last_id;
-    }
-    RB_VM_UNLOCK();
+    id = (uint32_t)(RUBY_ATOMIC_FETCH_ADD(ractor_last_id, 1) + 1);
 
     return id;
 }
-- 
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