/usr/include/boost/asio/detail/gcc_x86_fenced_block.hpp is in libboost1.49-dev 1.49.0-3.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | //
// detail/gcc_x86_fenced_block.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2012 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 BOOST_ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
#define BOOST_ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
#include <boost/asio/detail/push_options.hpp>
namespace boost {
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)
{
barrier1();
}
// Destructor.
~gcc_x86_fenced_block()
{
barrier2();
}
private:
static int barrier1()
{
int r = 0, m = 1;
__asm__ __volatile__ (
"xchgl %0, %1" :
"=r"(r), "=m"(m) :
"0"(1), "m"(m) :
"memory", "cc");
return r;
}
static void barrier2()
{
#if defined(__SSE2__)
__asm__ __volatile__ ("mfence" ::: "memory");
#else // defined(__SSE2__)
barrier1();
#endif // defined(__SSE2__)
}
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
#endif // BOOST_ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
|