https://git.ruby-lang.org/ruby.git/commit/?id=8590d61ea9

From 8590d61ea9b6b91c89a14a8d0f6829c8a3a8c6c8 Mon Sep 17 00:00:00 2001
From: Yuta Saito <kateinoigakukun@g...>
Date: Thu, 28 Oct 2021 15:51:40 +0900
Subject: Select including thread impl file at config time

---
 thread.c               | 6 ++----
 tool/m4/ruby_thread.m4 | 9 +++++++++
 vm_core.h              | 6 +-----
 win32/Makefile.sub     | 4 ++++
 4 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/thread.c b/thread.c
index 1209de948ad..0e3b53ae0b6 100644
--- a/thread.c
+++ b/thread.c
@@ -349,8 +349,9 @@ ubf_sigwait(void *ignore) https://github.com/ruby/ruby/blob/trunk/thread.c#L349
     rb_thread_wakeup_timer_thread(0);
 }
 
+#include THREAD_IMPL_SRC
+
 #if   defined(_WIN32)
-#include "thread_win32.c"
 
 #define DEBUG_OUT() \
   WaitForSingleObject(&debug_mutex, INFINITE); \
@@ -359,7 +360,6 @@ ubf_sigwait(void *ignore) https://github.com/ruby/ruby/blob/trunk/thread.c#L360
   ReleaseMutex(&debug_mutex);
 
 #elif defined(HAVE_PTHREAD_H)
-#include "thread_pthread.c"
 
 #define DEBUG_OUT() \
   pthread_mutex_lock(&debug_mutex); \
@@ -368,8 +368,6 @@ ubf_sigwait(void *ignore) https://github.com/ruby/ruby/blob/trunk/thread.c#L368
   fflush(stdout); \
   pthread_mutex_unlock(&debug_mutex);
 
-#else
-#error "unsupported thread type"
 #endif
 
 /*
diff --git a/tool/m4/ruby_thread.m4 b/tool/m4/ruby_thread.m4
index 92d80421f14..6f1e3960b16 100644
--- a/tool/m4/ruby_thread.m4
+++ b/tool/m4/ruby_thread.m4
@@ -16,4 +16,13 @@ AS_CASE(["$THREAD_MODEL"], https://github.com/ruby/ruby/blob/trunk/tool/m4/ruby_thread.m4#L16
 [win32],   [],
 [""],      [AC_MSG_ERROR(thread model is missing)],
            [AC_MSG_ERROR(unknown thread model $THREAD_MODEL)])
+
+THREAD_IMPL_H=thread_$THREAD_MODEL.h
+AS_IF([test ! -f "$srcdir/$THREAD_IMPL_H"],
+      [AC_MSG_ERROR('$srcdir/$THREAD_IMPL_H' must exist)])
+THREAD_IMPL_SRC=thread_$THREAD_MODEL.c
+AS_IF([test ! -f "$srcdir/$THREAD_IMPL_SRC"],
+      [AC_MSG_ERROR('$srcdir/$THREAD_IMPL_SRC' must exist)])
+AC_DEFINE_UNQUOTED(THREAD_IMPL_H, ["$THREAD_IMPL_H"])
+AC_DEFINE_UNQUOTED(THREAD_IMPL_SRC, ["$THREAD_IMPL_SRC"])
 ])dnl
diff --git a/vm_core.h b/vm_core.h
index 96437ff5599..2e022a6dd01 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -80,11 +80,7 @@ https://github.com/ruby/ruby/blob/trunk/vm_core.h#L80
 #include "darray.h"
 
 #include "ruby/thread_native.h"
-#if   defined(_WIN32)
-#include "thread_win32.h"
-#elif defined(HAVE_PTHREAD_H)
-#include "thread_pthread.h"
-#endif
+#include THREAD_IMPL_H
 
 #define RUBY_VM_THREAD_MODEL 2
 
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 2aef63985b1..ce8cafe8075 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -414,6 +414,8 @@ LIBRUBYARG_SHARED = $(LIBRUBY) https://github.com/ruby/ruby/blob/trunk/win32/Makefile.sub#L414
 LIBRUBY_RELATIVE = yes
 
 THREAD_MODEL  = win32
+THREAD_IMPL_H   = thread_$(THREAD_MODEL).h
+THREAD_IMPL_SRC = thread_$(THREAD_MODEL).c
 
 !if "$(CROSS_COMPILING)" == "yes"
 PREP          = $(arch)-fake.rb
@@ -873,6 +875,8 @@ $(CONFIG_H): $(MKFILES) $(srcdir)/win32/Makefile.sub $(win_srcdir)/Makefile.sub https://github.com/ruby/ruby/blob/trunk/win32/Makefile.sub#L875
 #define STACK_GROW_DIRECTION -1
 !endif
 #define COROUTINE_H "$(COROUTINE_H)"
+#define THREAD_IMPL_H "$(THREAD_IMPL_H)"
+#define THREAD_IMPL_SRC "$(THREAD_IMPL_SRC)"
 #define LOAD_RELATIVE 1
 #define DLEXT ".so"
 !if "$(libdir_basename)" != "lib"
-- 
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