nptl: Document crash due to incorrect use of locks

git-mirror · Aug 20, 2015 · cd4e69e · cd4e69e
1 parent 948e12a
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diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,8 @@
+2015-08-20  Florian Weimer  <fweimer@redhat.com>
+
+	* sysdeps/x86/elide.h (ELIDE_UNLOCK): Document crash due to
+	incorrect use.
+
 2015-08-19  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #18370]

diff --git a/sysdeps/x86/elide.h b/sysdeps/x86/elide.h
@@ -93,7 +93,9 @@ elision_adapt(signed char *adapt_count, unsigned int status)
     ret;						\
     })
 
-/* Returns true if lock defined by IS_LOCK_FREE was elided.  */
+/* Returns true if lock defined by IS_LOCK_FREE was elided.  The call
+   to _xend crashes if the application incorrectly tries to unlock a
+   lock which has not been locked.  */
 
 #define ELIDE_UNLOCK(is_lock_free)		\
   ({						\