From a8848860b8daf128446c6b507f4f992cde48a6b6 Mon Sep 17 00:00:00 2001
From: samuel <samuel@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 20 Nov 2018 10:17:04 +0000
Subject: [PATCH] Restore native non-coroutine code path.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65858 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 cont.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/cont.c b/cont.c
index 8ae7a4ec37..dd41a16d18 100644
--- a/cont.c
+++ b/cont.c
@@ -27,7 +27,7 @@
  */
 
 /*
-  Enable this include to make fiber yield/resume about twice as fast.
+  Enable FIBER_USE_COROUTINE to make fiber yield/resume much faster by using native assembly implementations.
   
   rvm install ruby-head-ioquatix-native-fiber --url https://github.com/ioquatix/ruby --branch native-fiber
   
@@ -832,10 +832,19 @@ fiber_entry(void *arg)
 }
 #else /* _WIN32 */
 
+#if defined(FIBER_USE_COROUTINE)
 COROUTINE fiber_entry(coroutine_context * from, coroutine_context * to)
 {
     rb_fiber_start();
 }
+#else
+NORETURN(static void fiber_entry(void *arg));
+static void
+fiber_entry(void *arg)
+{
+    rb_fiber_start();
+}
+#endif
 
 /*
  * FreeBSD require a first (i.e. addr) argument of mmap(2) is not NULL
@@ -978,7 +987,7 @@ fiber_setcontext(rb_fiber_t *newfib, rb_fiber_t *oldfib)
     swapcontext(&oldfib->context, &newfib->context);
 #endif
 }
-#endif
+#endif /* FIBER_USE_NATIVE */
 
 NOINLINE(NORETURN(static void cont_restore_1(rb_context_t *)));