92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
#ifndef BOOST_ATOMIC_DETAIL_LOCKPOOL_HPP
|
|
#define BOOST_ATOMIC_DETAIL_LOCKPOOL_HPP
|
|
|
|
// Copyright (c) 2011 Helge Bahmann
|
|
//
|
|
// 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/atomic/detail/config.hpp>
|
|
#include <boost/atomic/detail/link.hpp>
|
|
#ifndef BOOST_ATOMIC_FLAG_LOCK_FREE
|
|
#include <boost/smart_ptr/detail/lightweight_mutex.hpp>
|
|
#endif
|
|
|
|
#ifdef BOOST_HAS_PRAGMA_ONCE
|
|
#pragma once
|
|
#endif
|
|
|
|
namespace boost {
|
|
namespace atomics {
|
|
namespace detail {
|
|
|
|
#ifndef BOOST_ATOMIC_FLAG_LOCK_FREE
|
|
|
|
class lockpool
|
|
{
|
|
public:
|
|
typedef boost::detail::lightweight_mutex lock_type;
|
|
class scoped_lock :
|
|
public lock_type::scoped_lock
|
|
{
|
|
typedef lock_type::scoped_lock base_type;
|
|
|
|
public:
|
|
explicit scoped_lock(const volatile void * addr) : base_type(get_lock_for(addr))
|
|
{
|
|
}
|
|
|
|
BOOST_DELETED_FUNCTION(scoped_lock(scoped_lock const&))
|
|
BOOST_DELETED_FUNCTION(scoped_lock& operator=(scoped_lock const&))
|
|
};
|
|
|
|
private:
|
|
static BOOST_ATOMIC_DECL lock_type& get_lock_for(const volatile void * addr);
|
|
};
|
|
|
|
#else
|
|
|
|
class lockpool
|
|
{
|
|
public:
|
|
typedef atomic_flag lock_type;
|
|
|
|
class scoped_lock
|
|
{
|
|
private:
|
|
atomic_flag& flag_;
|
|
|
|
public:
|
|
explicit
|
|
scoped_lock(const volatile void * addr) : flag_(get_lock_for(addr))
|
|
{
|
|
for (; flag_.test_and_set(memory_order_acquire);)
|
|
{
|
|
#if defined(BOOST_ATOMIC_X86_PAUSE)
|
|
BOOST_ATOMIC_X86_PAUSE();
|
|
#endif
|
|
}
|
|
}
|
|
|
|
~scoped_lock(void)
|
|
{
|
|
flag_.clear(memory_order_release);
|
|
}
|
|
|
|
BOOST_DELETED_FUNCTION(scoped_lock(const scoped_lock &))
|
|
BOOST_DELETED_FUNCTION(scoped_lock& operator=(const scoped_lock &))
|
|
};
|
|
|
|
private:
|
|
static BOOST_ATOMIC_DECL lock_type& get_lock_for(const volatile void * addr);
|
|
};
|
|
|
|
#endif
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|