#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
#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__) || defined(__ARM_ARCH_7S__)
+
+# define BOOST_SP_ARM_BARRIER "dmb"
+# define BOOST_SP_ARM_HAS_LDREX
+
+#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"
+# define BOOST_SP_ARM_HAS_LDREX
+
+#else
+
+# define BOOST_SP_ARM_BARRIER ""
+
+#endif
+
namespace boost
{
{
int r;
+#ifdef BOOST_SP_ARM_HAS_LDREX
+
__asm__ __volatile__(
- "swp %0, %1, [%2]":
+ "ldrex %0, [%2]; \n"
+ "cmp %0, %1; \n"
+ "strexne %0, %1, [%2]; \n"
+ BOOST_SP_ARM_BARRIER :
"=&r"( r ): // outputs
"r"( 1 ), "r"( &v_ ): // inputs
"memory", "cc" );
+#else
+
+ __asm__ __volatile__(
+ "swp %0, %1, [%2];\n"
+ BOOST_SP_ARM_BARRIER :
+ "=&r"( r ): // outputs
+ "r"( 1 ), "r"( &v_ ): // inputs
+ "memory", "cc" );
+
+#endif
+
return r == 0;
}
void unlock()
{
- __asm__ __volatile__( "" ::: "memory" );
+ __asm__ __volatile__( BOOST_SP_ARM_BARRIER ::: "memory" );
*const_cast< int volatile* >( &v_ ) = 0;
}
#define BOOST_DETAIL_SPINLOCK_INIT {0}
+#undef BOOST_SP_ARM_BARRIER
+#undef BOOST_SP_ARM_HAS_LDREX
+
#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ARM_HPP_INCLUDED