From patchwork Sat Nov  5 12:59:36 2011
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Subject: [v3] use NSDMI in C++11 mutex types
Date: Sat, 05 Nov 2011 02:59:36 -0000
From: Jonathan Wakely <jwakely.gcc@gmail.com>
X-Patchwork-Id: 123838
Message-Id: <CAH6eHdQs90gH-0OBGHxwNO+SsOTmWCgmxwdXkkM7_v60oXHMgQ@mail.gmail.com>
To: "libstdc++" <libstdc++@gcc.gnu.org>, gcc-patches <gcc-patches@gcc.gnu.org>

Also use NSDMI for std::once_flag

        PR libstdc++/49894
        PR bootstrap/50982
        * include/std/mutex (once_flag): Use NSDMI.

tested x86_64-linux, committed to trunk.


Index: include/std/mutex
===================================================================
--- include/std/mutex	(revision 180749)
+++ include/std/mutex	(working copy)
@@ -760,11 +760,11 @@
   {
   private:
     typedef __gthread_once_t __native_type;
-    __native_type  _M_once;
+    __native_type  _M_once = __GTHREAD_ONCE_INIT;
 
   public:
     /// Constructor
-    constexpr once_flag() noexcept : _M_once(__GTHREAD_ONCE_INIT) { }
+    constexpr once_flag() noexcept = default;
 
     /// Deleted copy constructor
     once_flag(const once_flag&) = delete;