From 23a4e7149dc4253caf5ed0a528ffe5c21c4afb80 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Mon, 11 Jun 2018 14:50:42 +0900
Subject: Revert "No longer need to insert write barriers for fibers."

This reverts commit c6736357a72049a0eb2a31ccabcc3cd2baba7c9e.
The assumption was wrong and caused the issue; fix #4020
---
 mrbgems/mruby-fiber/src/fiber.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'mrbgems')

diff --git a/mrbgems/mruby-fiber/src/fiber.c b/mrbgems/mruby-fiber/src/fiber.c
index b88fa4949..bff8726a7 100644
--- a/mrbgems/mruby-fiber/src/fiber.c
+++ b/mrbgems/mruby-fiber/src/fiber.c
@@ -175,6 +175,9 @@ fiber_check_cfunc(mrb_state *mrb, struct mrb_context *c)
 static void
 fiber_switch_context(mrb_state *mrb, struct mrb_context *c)
 {
+  if (mrb->c->fib) {
+    mrb_write_barrier(mrb, (struct RBasic*)mrb->c->fib);
+  }
   c->status = MRB_FIBER_RUNNING;
   mrb->c = c;
 }
-- 
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