https://git.ruby-lang.org/ruby.git/commit/?id=62e08d4b84

From 62e08d4b844a3f4f7a6dadc6083cd0585485931b Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Tue, 24 May 2022 15:06:30 +0900
Subject: remove `DEBUG_OUT()` macro

This macro is no longer used ([GH-5933]).
---
 thread_none.c    |  2 --
 thread_pthread.c | 12 ------------
 thread_win32.c   |  6 ------
 3 files changed, 20 deletions(-)

diff --git a/thread_none.c b/thread_none.c
index b57e082543..cf4658e571 100644
--- a/thread_none.c
+++ b/thread_none.c
@@ -15,8 +15,6 @@ https://github.com/ruby/ruby/blob/trunk/thread_none.c#L15
 
 #include <time.h>
 
-#define DEBUG_OUT() (void)(0);
-
 #define TIME_QUANTUM_MSEC (100)
 #define TIME_QUANTUM_USEC (TIME_QUANTUM_MSEC * 1000)
 #define TIME_QUANTUM_NSEC (TIME_QUANTUM_USEC * 1000)
diff --git a/thread_pthread.c b/thread_pthread.c
index 2108431456..451f47e07f 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -51,18 +51,6 @@ https://github.com/ruby/ruby/blob/trunk/thread_pthread.c#L51
 #  define USE_EVENTFD (0)
 #endif
 
-#ifdef NON_SCALAR_THREAD_ID
-  #define DEBUG_OUT_NT_ID (NULL)
-#else
-  #define DEBUG_OUT_NT_ID ((void *)pthread_self())
-#endif
-
-#define DEBUG_OUT() \
-  pthread_mutex_lock(&debug_mutex); \
-  printf(POSITION_FORMAT"%"PRI_THREAD_ID" - %s" POSITION_ARGS, DEBUG_OUT_NT_ID, buf);	\
-  fflush(stdout); \
-  pthread_mutex_unlock(&debug_mutex);
-
 #if defined(SIGVTALRM) && !defined(__CYGWIN__) && !defined(__EMSCRIPTEN__)
 #  define USE_UBF_LIST 1
 #endif
diff --git a/thread_win32.c b/thread_win32.c
index ec5d336589..a8c9b94cd7 100644
--- a/thread_win32.c
+++ b/thread_win32.c
@@ -25,12 +25,6 @@ https://github.com/ruby/ruby/blob/trunk/thread_win32.c#L25
 #define ubf_timer_disarm() do {} while (0)
 #define ubf_list_atfork() do {} while (0)
 
-#define DEBUG_OUT() \
-  WaitForSingleObject(&debug_mutex, INFINITE); \
-  printf(POSITION_FORMAT"%#lx - %s" POSITION_ARGS, GetCurrentThreadId(), buf); \
-  fflush(stdout); \
-  ReleaseMutex(&debug_mutex);
-
 static volatile DWORD ruby_native_thread_key = TLS_OUT_OF_INDEXES;
 
 static int w32_wait_events(HANDLE *events, int count, DWORD timeout, rb_thread_t *th);
-- 
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