diff options
Diffstat (limited to 'contrib/src/boost/smart_ptr/detail/spinlock_std_atomic.hpp')
-rw-r--r-- | contrib/src/boost/smart_ptr/detail/spinlock_std_atomic.hpp | 166 |
1 files changed, 83 insertions, 83 deletions
diff --git a/contrib/src/boost/smart_ptr/detail/spinlock_std_atomic.hpp b/contrib/src/boost/smart_ptr/detail/spinlock_std_atomic.hpp index a61c1cd..6e46229 100644 --- a/contrib/src/boost/smart_ptr/detail/spinlock_std_atomic.hpp +++ b/contrib/src/boost/smart_ptr/detail/spinlock_std_atomic.hpp @@ -1,83 +1,83 @@ -#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED -#define BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED - -// MS compatible compilers support #pragma once - -#if defined(_MSC_VER) && (_MSC_VER >= 1020) -# pragma once -#endif - -// -// Copyright (c) 2014 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/smart_ptr/detail/yield_k.hpp> -#include <atomic> - -namespace boost -{ - -namespace detail -{ - -class spinlock -{ -public: - - std::atomic_flag v_; - -public: - - bool try_lock() - { - return !v_.test_and_set( std::memory_order_acquire ); - } - - void lock() - { - for( unsigned k = 0; !try_lock(); ++k ) - { - boost::detail::yield( k ); - } - } - - void unlock() - { - v_ .clear( std::memory_order_release ); - } - -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 { ATOMIC_FLAG_INIT } - -#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED +#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+// Copyright (c) 2014 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/smart_ptr/detail/yield_k.hpp>
+#include <atomic>
+
+namespace boost
+{
+
+namespace detail
+{
+
+class spinlock
+{
+public:
+
+ std::atomic_flag v_;
+
+public:
+
+ bool try_lock()
+ {
+ return !v_.test_and_set( std::memory_order_acquire );
+ }
+
+ void lock()
+ {
+ for( unsigned k = 0; !try_lock(); ++k )
+ {
+ boost::detail::yield( k );
+ }
+ }
+
+ void unlock()
+ {
+ v_ .clear( std::memory_order_release );
+ }
+
+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 { ATOMIC_FLAG_INIT }
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED
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