https://git.ruby-lang.org/ruby.git/commit/?id=0f5ae7a200

From 0f5ae7a200673d38d035e7d3165f5441fe0d49a7 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 23 Apr 2020 22:19:28 +0900
Subject: Fixed inverted current thread condition [Bug #16808]


diff --git a/thread_pthread.c b/thread_pthread.c
index 6bcb18d..f5eebf5 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -1622,7 +1622,7 @@ native_set_another_thread_name(rb_nativethread_id_t thread_id, VALUE name) https://github.com/ruby/ruby/blob/trunk/thread_pthread.c#L1622
     char buf[thread_name_max];
     const char *s = "";
 # if !defined SET_ANOTHER_THREAD_NAME
-    if (pthread_equal(pthread_self(), thread_id)) return;
+    if (!pthread_equal(pthread_self(), thread_id)) return;
 # endif
     if (!NIL_P(name)) {
         long n;
-- 
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