fiber/detail/rtm.hpp

0001
0002 //          Copyright Oliver Kowalke 2017.
0003 // Distributed under the Boost Software License, Version 1.0.
0004 //    (See accompanying file LICENSE_1_0.txt or copy at
0005 //          http://www.boost.org/LICENSE_1_0.txt)
0006 //
0007
0008 #ifndef BOOST_FIBER_DETAIL_RTM_H
0009 #define BOOST_FIBER_DETAIL_RTM_H
0010
0011 #include <cstdint>
0012
0013 #include <boost/assert.hpp>
0014 #include <boost/config.hpp>
0015
0016 #include <boost/fiber/detail/config.hpp>
0017
0018 #ifdef BOOST_HAS_ABI_HEADERS
0019 #  include BOOST_ABI_PREFIX
0020 #endif
0021
0022 namespace boost {
0023 namespace fibers {
0024 namespace detail {
0025
0026 struct rtm_status {
0027     enum {
0028         none            = 0,
0029         explicit_abort  = 1 << 0,
0030         may_retry       = 1 << 1,
0031         memory_conflict = 1 << 2,
0032         buffer_overflow = 1 << 3,
0033         debug_hit       = 1 << 4,
0034         nested_abort    = 1 << 5
0035     };
0036
0037     static constexpr std::uint32_t success = ~std::uint32_t{ 0 };
0038 };
0039
0040 static BOOST_FORCEINLINE
0041 std::uint32_t rtm_begin() noexcept {
0042     std::uint32_t result = rtm_status::success;
0043     __asm__ __volatile__
0044     (
0045         ".byte 0xc7,0xf8 ; .long 0"
0046         : "+a" (result)
0047         :
0048         : "memory"
0049     );
0050     return result;
0051 }
0052
0053 static BOOST_FORCEINLINE
0054 void rtm_end() noexcept {
0055     __asm__ __volatile__
0056     (
0057         ".byte 0x0f,0x01,0xd5"
0058         :
0059         :
0060         : "memory"
0061     );
0062 }
0063
0064 static BOOST_FORCEINLINE
0065 void rtm_abort_lock_not_free() noexcept {
0066     __asm__ __volatile__
0067     (
0068         ".byte 0xc6,0xf8,0xff"
0069         :
0070         :
0071         : "memory"
0072     );
0073 }
0074
0075 static BOOST_FORCEINLINE
0076 bool rtm_test() noexcept {
0077     bool result;
0078     __asm__ __volatile__
0079     (
0080         ".byte 0x0f,0x01,0xd6; setz %0"
0081         : "=q" (result)
0082         :
0083         : "memory"
0084     );
0085     return result;
0086 }
0087
0088 }}}
0089
0090 #ifdef BOOST_HAS_ABI_HEADERS
0091 #  include BOOST_ABI_SUFFIX
0092 #endif
0093
0094 #endif // BOOST_FIBER_DETAIL_RTM_H