From: redi <redi@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Sun, 9 Jun 2013 23:54:07 +0000 (+0000)
Subject: 	* include/std/mutex (call_once): Remove parentheses to fix error in
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1e49613638a43713b2e1113ee89922fc6cc08858;p=thirdparty%2Fgcc.git

	* include/std/mutex (call_once): Remove parentheses to fix error in
	c++1y and gnu++1y mode.
	* testsuite/30_threads/mutex/try_lock/2.cc: Call try_lock() in new
	thread to avoid undefined behaviour.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@199875 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 8ca5e1ac814a..5934f9bbe0ad 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,10 @@
+2013-06-09  Jonathan Wakely  <jwakely.gcc@gmail.com>
+
+	* include/std/mutex (call_once): Remove parentheses to fix error in
+	c++1y and gnu++1y mode.
+	* testsuite/30_threads/mutex/try_lock/2.cc: Call try_lock() in new
+	thread to avoid undefined behaviour.
+
 2013-06-08  Ed Smith-Rowland  <3dw4rd@verizon.net>
 
 	Simplify and clean up library literals.
diff --git a/libstdc++-v3/include/std/mutex b/libstdc++-v3/include/std/mutex
index 3c666c19e502..cdd05a37cbee 100644
--- a/libstdc++-v3/include/std/mutex
+++ b/libstdc++-v3/include/std/mutex
@@ -783,7 +783,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       __set_once_functor_lock_ptr(&__functor_lock);
 #endif
 
-      int __e = __gthread_once(&(__once._M_once), &__once_proxy);
+      int __e = __gthread_once(&__once._M_once, &__once_proxy);
 
 #ifndef _GLIBCXX_HAVE_TLS
       if (__functor_lock)
diff --git a/libstdc++-v3/testsuite/30_threads/mutex/try_lock/2.cc b/libstdc++-v3/testsuite/30_threads/mutex/try_lock/2.cc
index bb3fcd412e4e..f2a67231cdad 100644
--- a/libstdc++-v3/testsuite/30_threads/mutex/try_lock/2.cc
+++ b/libstdc++-v3/testsuite/30_threads/mutex/try_lock/2.cc
@@ -24,6 +24,7 @@
 
 
 #include <mutex>
+#include <thread>
 #include <system_error>
 #include <testsuite_hooks.h>
 
@@ -38,15 +39,18 @@ int main()
       m.lock();
       bool b;
 
-      try
-	{
-	  b = m.try_lock();
-	  VERIFY( !b );
-	}
-      catch (const std::system_error& e)
-	{
-	  VERIFY( false );
-	}
+      std::thread t([&] {
+        try
+          {
+            b = m.try_lock();
+          }
+        catch (const std::system_error& e)
+          {
+            VERIFY( false );
+          }
+      });
+      t.join();
+      VERIFY( !b );
 
       m.unlock();
     }