import quincy beta 17.1.0

[ceph.git] / ceph / src / boost / boost / atomic / detail / pause.hpp

diff --git a/ceph/src/boost/boost/atomic/detail/pause.hpp b/ceph/src/boost/boost/atomic/detail/pause.hpp
index 37aa5ca84eccbe2010a65407589a4364957d6dd8..efdfb62b6a226fb67fe0beaf8faacdb3b5ae558b 100644 (file)
--- a/ceph/src/boost/boost/atomic/detail/pause.hpp
+++ b/ceph/src/boost/boost/atomic/detail/pause.hpp
@@ -4,23 +4,31 @@
  *          http://www.boost.org/LICENSE_1_0.txt)
  *
  * (C) Copyright 2013 Tim Blechmann
- * (C) Copyright 2013 Andrey Semashev
+ * (C) Copyright 2013, 2020 Andrey Semashev
  */
 
 #ifndef BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
 #define BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
 
 #include <boost/atomic/detail/config.hpp>
+#include <boost/atomic/detail/header.hpp>
 
 #ifdef BOOST_HAS_PRAGMA_ONCE
 #pragma once
 #endif
 
-#if defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_IX86))
+#if defined(_MSC_VER)
+#if defined(_M_AMD64) || defined(_M_IX86)
 extern "C" void _mm_pause(void);
 #if defined(BOOST_MSVC)
 #pragma intrinsic(_mm_pause)
 #endif
+#elif defined(_M_ARM64) || defined(_M_ARM)
+extern "C" void __yield(void);
+#if defined(BOOST_MSVC)
+#pragma intrinsic(__yield)
+#endif
+#endif
 #endif
 
 namespace boost {
@@ -29,10 +37,18 @@ namespace detail {
 
 BOOST_FORCEINLINE void pause() BOOST_NOEXCEPT
 {
-#if defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_IX86))
+#if defined(_MSC_VER)
+#if defined(_M_AMD64) || defined(_M_IX86)
     _mm_pause();
-#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
-    __asm__ __volatile__("pause;");
+#elif defined(_M_ARM64) || defined(_M_ARM)
+    __yield();
+#endif
+#elif defined(__GNUC__)
+#if defined(__i386__) || defined(__x86_64__)
+    __asm__ __volatile__("pause;" : : : "memory");
+#elif (defined(__ARM_ARCH) && __ARM_ARCH >= 8) || defined(__ARM_ARCH_8A__) || defined(__aarch64__)
+    __asm__ __volatile__("yield;" : : : "memory");
+#endif
 #endif
 }
 
@@ -40,4 +56,6 @@ BOOST_FORCEINLINE void pause() BOOST_NOEXCEPT
 } // namespace atomics
 } // namespace boost
 
+#include <boost/atomic/detail/footer.hpp>
+
 #endif // BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_