https://git.ruby-lang.org/ruby.git/commit/?id=257e01b61d

From 257e01b61db90ecf3a53957281770b5f3db3f919 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 26 Apr 2020 22:39:36 +0900
Subject: Solaris does not provide atomic_sub family


diff --git a/ruby_atomic.h b/ruby_atomic.h
index eaa9fcd..fa888a1 100644
--- a/ruby_atomic.h
+++ b/ruby_atomic.h
@@ -117,7 +117,7 @@ rb_atomic_fetch_add(volatile rb_atomic_t *var, rb_atomic_t val) https://github.com/ruby/ruby/blob/trunk/ruby_atomic.h#L117
 static inline rb_atomic_t
 rb_atomic_fetch_sub(volatile rb_atomic_t *var, rb_atomic_t val)
 {
-    return atomic_sub_int_nv(var, val) + val;
+    return atomic_add_int_nv(var, (rb_atomic_t)(-(int)val)) + val;
 }
 
 # if defined(_LP64) || defined(_I32LPx)
-- 
cgit v0.10.2


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