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Stored size: 1.48 KB
Contents
#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ATOMIC_HPP_INCLUDED
#define BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ATOMIC_HPP_INCLUDED
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
// Copyright 2008, 2020 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/smart_ptr/detail/yield_k.hpp>
#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
#include <boost/config/pragma_message.hpp>
BOOST_PRAGMA_MESSAGE("Using __atomic spinlock")
#endif
namespace boost
{
namespace detail
{
class spinlock
{
public:
unsigned char v_;
public:
bool try_lock()
{
return __atomic_test_and_set( &v_, __ATOMIC_ACQUIRE ) == 0;
}
void lock()
{
for( unsigned k = 0; !try_lock(); ++k )
{
boost::detail::yield( k );
}
}
void unlock()
{
__atomic_clear( &v_, __ATOMIC_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 {0}
#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_GCC_ATOMIC_HPP_INCLUDED
Version data entries
9 entries across 9 versions & 1 rubygems