[Boost-commit] svn:boost r75389 - trunk/boost/smart_ptr/detail

Subject: [Boost-commit] svn:boost r75389 - trunk/boost/smart_ptr/detail
From: pdimov_at_[hidden]
Date: 2011-11-07 12:50:32

Author: pdimov
Date: 2011-11-07 12:50:31 EST (Mon, 07 Nov 2011)
New Revision: 75389
URL: http://svn.boost.org/trac/boost/changeset/75389

Log:
Add ARM memory barriers. Refs #5372.
Text files modified: 
   trunk/boost/smart_ptr/detail/spinlock_gcc_arm.hpp |    23 ++++++++++++++++++++---                 
   1 files changed, 20 insertions(+), 3 deletions(-)

Modified: trunk/boost/smart_ptr/detail/spinlock_gcc_arm.hpp
==============================================================================
--- trunk/boost/smart_ptr/detail/spinlock_gcc_arm.hpp	(original)
+++ trunk/boost/smart_ptr/detail/spinlock_gcc_arm.hpp	2011-11-07 12:50:31 EST (Mon, 07 Nov 2011)
@@ -2,7 +2,7 @@
 #define BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ARM_HPP_INCLUDED
 
 //
-//  Copyright (c) 2008 Peter Dimov
+//  Copyright (c) 2008, 2011 Peter Dimov
 //
 //  Distributed under the Boost Software License, Version 1.0.
 //  See accompanying file LICENSE_1_0.txt or copy at
@@ -11,6 +11,20 @@
 
 #include <boost/smart_ptr/detail/yield_k.hpp>
 
+#if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
+
+# define BOOST_SP_ARM_BARRIER "dmb"
+
+#elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__)
+
+# define BOOST_SP_ARM_BARRIER "mcr p15, 0, r0, c7, c10, 5"
+
+#else
+
+# define BOOST_SP_ARM_BARRIER ""
+
+#endif
+
 namespace boost
 {
 
@@ -30,7 +44,8 @@
         int r;
 
         __asm__ __volatile__(
-            "swp %0, %1, [%2]":
+            "swp %0, %1, [%2]\n\t"
+			BOOST_SP_ARM_BARRIER :
             "=&r"( r ): // outputs
             "r"( 1 ), "r"( &v_ ): // inputs
             "memory", "cc" );
@@ -48,7 +63,7 @@
 
     void unlock()
     {
-        __asm__ __volatile__( "" ::: "memory" );
+        __asm__ __volatile__( BOOST_SP_ARM_BARRIER ::: "memory" );
         *const_cast< int volatile* >( &v_ ) = 0;
     }
 
@@ -82,4 +97,6 @@
 
 #define BOOST_DETAIL_SPINLOCK_INIT {0}
 
+#undef BOOST_SP_ARM_BARRIER
+
 #endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ARM_HPP_INCLUDED