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86 lines
1.5 KiB
86 lines
1.5 KiB
#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ATOMIC_HPP_INCLUDED
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#define BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ATOMIC_HPP_INCLUDED
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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// Copyright 2008, 2020 Peter Dimov
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <boost/smart_ptr/detail/yield_k.hpp>
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#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
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#include <boost/config/pragma_message.hpp>
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BOOST_PRAGMA_MESSAGE("Using __atomic spinlock")
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#endif
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namespace boost
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{
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namespace detail
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{
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class spinlock
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{
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public:
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unsigned char v_;
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public:
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bool try_lock()
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{
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return __atomic_test_and_set( &v_, __ATOMIC_ACQUIRE ) == 0;
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}
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void lock()
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{
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for( unsigned k = 0; !try_lock(); ++k )
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{
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boost::detail::yield( k );
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}
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}
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void unlock()
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{
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__atomic_clear( &v_, __ATOMIC_RELEASE );
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}
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public:
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class scoped_lock
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{
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private:
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spinlock & sp_;
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scoped_lock( scoped_lock const & );
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scoped_lock & operator=( scoped_lock const & );
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public:
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explicit scoped_lock( spinlock & sp ): sp_( sp )
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{
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sp.lock();
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}
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~scoped_lock()
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{
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sp_.unlock();
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}
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};
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};
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} // namespace detail
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} // namespace boost
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#define BOOST_DETAIL_SPINLOCK_INIT {0}
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#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ATOMIC_HPP_INCLUDED
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