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+
+// Copyright Oliver Kowalke 2017.
+// 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_FIBER_DETAIL_RTM_H
+#define BOOST_FIBER_DETAIL_RTM_H
+
+#include <cstdint>
+
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+
+#include <boost/fiber/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace fibers {
+namespace detail {
+
+struct rtm_status {
+ enum {
+ none = 0,
+ explicit_abort = 1 << 0,
+ may_retry = 1 << 1,
+ memory_conflict = 1 << 2,
+ buffer_overflow = 1 << 3,
+ debug_hit = 1 << 4,
+ nested_abort = 1 << 5
+ };
+
+ static constexpr std::uint32_t success = ~std::uint32_t{ 0 };
+};
+
+static BOOST_FORCEINLINE
+std::uint32_t rtm_begin() noexcept {
+ std::uint32_t result = rtm_status::success;
+ __asm__ __volatile__
+ (
+ ".byte 0xc7,0xf8 ; .long 0"
+ : "+a" (result)
+ :
+ : "memory"
+ );
+ return result;
+}
+
+static BOOST_FORCEINLINE
+void rtm_end() noexcept {
+ __asm__ __volatile__
+ (
+ ".byte 0x0f,0x01,0xd5"
+ :
+ :
+ : "memory"
+ );
+}
+
+static BOOST_FORCEINLINE
+void rtm_abort_lock_not_free() noexcept {
+ __asm__ __volatile__
+ (
+ ".byte 0xc6,0xf8,0xff"
+ :
+ :
+ : "memory"
+ );
+}
+
+static BOOST_FORCEINLINE
+bool rtm_test() noexcept {
+ bool result;
+ __asm__ __volatile__
+ (
+ ".byte 0x0f,0x01,0xd6; setz %0"
+ : "=q" (result)
+ :
+ : "memory"
+ );
+ return result;
+}
+
+}}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_FIBER_DETAIL_RTM_H