From c95467e597963a3016ba918235c4400c6e00adb5 Mon Sep 17 00:00:00 2001
From: normal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 29 Jul 2018 10:15:11 +0000
Subject: thread_pthread.c: clear altstacks in thread cache at GVL destruction

Otherwise, an altstack may live past ObjectSpace destruction
and xfree-ing the altstack will segfault.

[ruby-core:85621] [Feature #14487]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64102 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 vm_core.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'vm_core.h')

diff --git a/vm_core.h b/vm_core.h
index 67c384c509..c05acb8ab7 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -123,9 +123,11 @@
 void *rb_register_sigaltstack(void);
 #  define RB_ALTSTACK_INIT(var) var = rb_register_sigaltstack()
 #  define RB_ALTSTACK_FREE(var) xfree(var)
+#  define RB_ALTSTACK(var)  var
 #else /* noop */
 #  define RB_ALTSTACK_INIT(var)
 #  define RB_ALTSTACK_FREE(var)
+#  define RB_ALTSTACK(var) (0)
 #endif
 
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