92 lines
2.1 KiB
C++
92 lines
2.1 KiB
C++
//
|
|
// detail/gcc_arm_fenced_block.hpp
|
|
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2023 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_ARM_FENCED_BLOCK_HPP
|
|
#define ASIO_DETAIL_GCC_ARM_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(__arm__)
|
|
|
|
#include "asio/detail/noncopyable.hpp"
|
|
|
|
#include "asio/detail/push_options.hpp"
|
|
|
|
namespace asio {
|
|
namespace detail {
|
|
|
|
class gcc_arm_fenced_block
|
|
: private noncopyable
|
|
{
|
|
public:
|
|
enum half_t { half };
|
|
enum full_t { full };
|
|
|
|
// Constructor for a half fenced block.
|
|
explicit gcc_arm_fenced_block(half_t)
|
|
{
|
|
}
|
|
|
|
// Constructor for a full fenced block.
|
|
explicit gcc_arm_fenced_block(full_t)
|
|
{
|
|
barrier();
|
|
}
|
|
|
|
// Destructor.
|
|
~gcc_arm_fenced_block()
|
|
{
|
|
barrier();
|
|
}
|
|
|
|
private:
|
|
static void barrier()
|
|
{
|
|
#if defined(__ARM_ARCH_4__) \
|
|
|| defined(__ARM_ARCH_4T__) \
|
|
|| defined(__ARM_ARCH_5__) \
|
|
|| defined(__ARM_ARCH_5E__) \
|
|
|| defined(__ARM_ARCH_5T__) \
|
|
|| defined(__ARM_ARCH_5TE__) \
|
|
|| defined(__ARM_ARCH_5TEJ__) \
|
|
|| defined(__ARM_ARCH_6__) \
|
|
|| defined(__ARM_ARCH_6J__) \
|
|
|| defined(__ARM_ARCH_6K__) \
|
|
|| defined(__ARM_ARCH_6Z__) \
|
|
|| defined(__ARM_ARCH_6ZK__) \
|
|
|| defined(__ARM_ARCH_6T2__)
|
|
# if defined(__thumb__)
|
|
// This is just a placeholder and almost certainly not sufficient.
|
|
__asm__ __volatile__ ("" : : : "memory");
|
|
# else // defined(__thumb__)
|
|
int a = 0, b = 0;
|
|
__asm__ __volatile__ ("swp %0, %1, [%2]"
|
|
: "=&r"(a) : "r"(1), "r"(&b) : "memory", "cc");
|
|
# endif // defined(__thumb__)
|
|
#else
|
|
// ARMv7 and later.
|
|
__asm__ __volatile__ ("dmb" : : : "memory");
|
|
#endif
|
|
}
|
|
};
|
|
|
|
} // namespace detail
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#endif // defined(__GNUC__) && defined(__arm__)
|
|
|
|
#endif // ASIO_DETAIL_GCC_ARM_FENCED_BLOCK_HPP
|