1 | #ifndef BOOST_SMART_PTR_DETAIL_SP_THREAD_PAUSE_HPP_INCLUDED |
2 | #define BOOST_SMART_PTR_DETAIL_SP_THREAD_PAUSE_HPP_INCLUDED |
3 | |
4 | // MS compatible compilers support #pragma once |
5 | |
6 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
7 | # pragma once |
8 | #endif |
9 | |
10 | // boost/smart_ptr/detail/sp_thread_pause.hpp |
11 | // |
12 | // inline void bost::detail::sp_thread_pause(); |
13 | // |
14 | // Emits a "pause" instruction. |
15 | // |
16 | // Copyright 2008, 2020 Peter Dimov |
17 | // Distributed under the Boost Software License, Version 1.0 |
18 | // https://www.boost.org/LICENSE_1_0.txt |
19 | |
20 | #if defined(_MSC_VER) && _MSC_VER >= 1310 && ( defined(_M_IX86) || defined(_M_X64) ) && !defined(__c2__) |
21 | |
22 | extern "C" void _mm_pause(); |
23 | |
24 | #define BOOST_SP_PAUSE _mm_pause(); |
25 | |
26 | #elif defined(__GNUC__) && ( defined(__i386__) || defined(__x86_64__) ) |
27 | |
28 | #define BOOST_SP_PAUSE __asm__ __volatile__( "rep; nop" : : : "memory" ); |
29 | |
30 | #else |
31 | |
32 | #define BOOST_SP_PAUSE |
33 | |
34 | #endif |
35 | |
36 | namespace boost |
37 | { |
38 | namespace detail |
39 | { |
40 | |
41 | inline void sp_thread_pause() |
42 | { |
43 | BOOST_SP_PAUSE |
44 | } |
45 | |
46 | } // namespace detail |
47 | } // namespace boost |
48 | |
49 | #undef BOOST_SP_PAUSE |
50 | |
51 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_THREAD_PAUSE_HPP_INCLUDED |
52 | |