100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
//
|
|
// detail/gcc_x86_fenced_block.hpp
|
|
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
|
|
//
|
|
// 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)
|
|
//
|
|
|
|
#ifndef ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
|
|
#define ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
|
|
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
|
|
# pragma once
|
|
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
|
|
|
|
#include "asio/detail/config.hpp"
|
|
|
|
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
|
|
|
|
#include "asio/detail/noncopyable.hpp"
|
|
|
|
#include "asio/detail/push_options.hpp"
|
|
|
|
namespace asio {
|
|
namespace detail {
|
|
|
|
class gcc_x86_fenced_block
|
|
: private noncopyable
|
|
{
|
|
public:
|
|
enum half_t { half };
|
|
enum full_t { full };
|
|
|
|
// Constructor for a half fenced block.
|
|
explicit gcc_x86_fenced_block(half_t)
|
|
{
|
|
}
|
|
|
|
// Constructor for a full fenced block.
|
|
explicit gcc_x86_fenced_block(full_t)
|
|
{
|
|
lbarrier();
|
|
}
|
|
|
|
// Destructor.
|
|
~gcc_x86_fenced_block()
|
|
{
|
|
sbarrier();
|
|
}
|
|
|
|
private:
|
|
static int barrier()
|
|
{
|
|
int r = 0, m = 1;
|
|
__asm__ __volatile__ (
|
|
"xchgl %0, %1" :
|
|
"=r"(r), "=m"(m) :
|
|
"0"(1), "m"(m) :
|
|
"memory", "cc");
|
|
return r;
|
|
}
|
|
|
|
static void lbarrier()
|
|
{
|
|
#if defined(__SSE2__)
|
|
# if (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
|
|
__builtin_ia32_lfence();
|
|
# else // (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
|
|
__asm__ __volatile__ ("lfence" ::: "memory");
|
|
# endif // (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
|
|
#else // defined(__SSE2__)
|
|
barrier();
|
|
#endif // defined(__SSE2__)
|
|
}
|
|
|
|
static void sbarrier()
|
|
{
|
|
#if defined(__SSE2__)
|
|
# if (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
|
|
__builtin_ia32_sfence();
|
|
# else // (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
|
|
__asm__ __volatile__ ("sfence" ::: "memory");
|
|
# endif // (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
|
|
#else // defined(__SSE2__)
|
|
barrier();
|
|
#endif // defined(__SSE2__)
|
|
}
|
|
};
|
|
|
|
} // namespace detail
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#endif // defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
|
|
|
|
#endif // ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
|