From: pdimov_at_[hidden]
Date: 2008-04-09 17:08:39
Author: pdimov
Date: 2008-04-09 17:08:39 EDT (Wed, 09 Apr 2008)
New Revision: 44138
URL: http://svn.boost.org/trac/boost/changeset/44138
Log:
spinlock_gcc_arm.hpp added.
Added:
trunk/boost/detail/spinlock_gcc_arm.hpp (contents, props changed)
Text files modified:
trunk/boost/detail/spinlock.hpp | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
Modified: trunk/boost/detail/spinlock.hpp
==============================================================================
--- trunk/boost/detail/spinlock.hpp (original)
+++ trunk/boost/detail/spinlock.hpp 2008-04-09 17:08:39 EDT (Wed, 09 Apr 2008)
@@ -30,7 +30,9 @@
#include <boost/config.hpp>
-#if defined(__GNUC__) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 )
+#if defined(__GNUC__) && defined( __arm__ )
+# include <boost/detail/spinlock_gcc_arm.hpp>
+#elif defined(__GNUC__) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 )
# include <boost/detail/spinlock_sync.hpp>
#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
# include <boost/detail/spinlock_w32.hpp>
Added: trunk/boost/detail/spinlock_gcc_arm.hpp
==============================================================================
--- (empty file)
+++ trunk/boost/detail/spinlock_gcc_arm.hpp 2008-04-09 17:08:39 EDT (Wed, 09 Apr 2008)
@@ -0,0 +1,85 @@
+#ifndef BOOST_DETAIL_SPINLOCK_GCC_ARM_HPP_INCLUDED
+#define BOOST_DETAIL_SPINLOCK_GCC_ARM_HPP_INCLUDED
+
+//
+// Copyright (c) 2008 Peter Dimov
+//
+// Distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#include <boost/detail/yield_k.hpp>
+
+namespace boost
+{
+
+namespace detail
+{
+
+class spinlock
+{
+public:
+
+ int v_;
+
+public:
+
+ bool try_lock()
+ {
+ int r;
+
+ __asm__ __volatile__(
+ "swp %0, %1, [%2]":
+ "=r"( r ): // outputs
+ "r"( 1 ), "r"( &v_ ): // inputs
+ "memory", "cc" );
+
+ return r == 0;
+ }
+
+ void lock()
+ {
+ for( unsigned k = 0; !try_lock(); ++k )
+ {
+ boost::detail::yield( k );
+ }
+ }
+
+ void unlock()
+ {
+ __asm__ __volatile__( "" ::: "memory" );
+ *const_cast< int volatile* >( &v_ ) = 0;
+ }
+
+public:
+
+ class scoped_lock
+ {
+ private:
+
+ spinlock & sp_;
+
+ scoped_lock( scoped_lock const & );
+ scoped_lock & operator=( scoped_lock const & );
+
+ public:
+
+ explicit scoped_lock( spinlock & sp ): sp_( sp )
+ {
+ sp.lock();
+ }
+
+ ~scoped_lock()
+ {
+ sp_.unlock();
+ }
+ };
+};
+
+} // namespace detail
+} // namespace boost
+
+#define BOOST_DETAIL_SPINLOCK_INIT {0}
+
+#endif // #ifndef BOOST_DETAIL_SPINLOCK_GCC_ARM_HPP_INCLUDED