update ceph source to reef 18.1.2

[ceph.git] / ceph / src / boost / libs / atomic / src / wait_on_address.cpp

diff --git a/ceph/src/boost/libs/atomic/src/wait_on_address.cpp b/ceph/src/boost/libs/atomic/src/wait_on_address.cpp
new file mode 100644 (file)
index 0000000..6f8a165
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+++ b/ceph/src/boost/libs/atomic/src/wait_on_address.cpp
@@ -0,0 +1,113 @@
+/*
+ * 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)
+ *
+ * Copyright (c) 2020 Andrey Semashev
+ */
+/*!
+ * \file   wait_on_address.cpp
+ *
+ * This file contains implementation of runtime detection of \c WaitOnAddress and related APIs on Windows.
+ *
+ * https://docs.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-waitonaddress
+ * https://docs.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-wakebyaddresssingle
+ * https://docs.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-wakebyaddressall
+ */
+
+// Include boost/winapi/config.hpp first to make sure target Windows version is selected by Boost.WinAPI
+#include <boost/winapi/config.hpp>
+
+#include <boost/winapi/basic_types.hpp>
+
+#include <boost/atomic/detail/config.hpp>
+#include <boost/atomic/detail/link.hpp>
+#include <boost/atomic/detail/once_flag.hpp>
+#include <boost/atomic/detail/wait_on_address.hpp>
+
+#if BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM
+
+#include <boost/static_assert.hpp>
+#include <boost/memory_order.hpp>
+#include <boost/winapi/thread.hpp>
+#include <boost/winapi/get_proc_address.hpp>
+#include <boost/winapi/dll.hpp>
+
+#include <boost/atomic/detail/core_operations.hpp>
+
+#endif // BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM
+
+#include <boost/atomic/detail/header.hpp>
+
+namespace boost {
+namespace atomics {
+namespace detail {
+
+BOOST_ATOMIC_DECL wait_on_address_t* wait_on_address = NULL;
+BOOST_ATOMIC_DECL wake_by_address_t* wake_by_address_single = NULL;
+BOOST_ATOMIC_DECL wake_by_address_t* wake_by_address_all = NULL;
+
+#if BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM
+
+BOOST_ATOMIC_DECL once_flag wait_functions_once_flag = { 2u };
+
+BOOST_ATOMIC_DECL void initialize_wait_functions() BOOST_NOEXCEPT
+{
+    BOOST_STATIC_ASSERT_MSG(once_flag_operations::is_always_lock_free, "Boost.Atomic unsupported target platform: native atomic operations not implemented for bytes");
+
+    once_flag_operations::storage_type old_val = once_flag_operations::load(wait_functions_once_flag.m_flag, boost::memory_order_acquire);
+    while (true)
+    {
+        if (old_val == 2u)
+        {
+            if (BOOST_UNLIKELY(!once_flag_operations::compare_exchange_strong(wait_functions_once_flag.m_flag, old_val, 1u, boost::memory_order_relaxed, boost::memory_order_relaxed)))
+                continue;
+
+            boost::winapi::HMODULE_ kernel_base = boost::winapi::get_module_handle(L"api-ms-win-core-synch-l1-2-0.dll");
+            if (BOOST_LIKELY(kernel_base != NULL))
+            {
+                wait_on_address_t* woa = (wait_on_address_t*)boost::winapi::get_proc_address(kernel_base, "WaitOnAddress");
+                if (BOOST_LIKELY(woa != NULL))
+                {
+                    wake_by_address_t* wbas = (wake_by_address_t*)boost::winapi::get_proc_address(kernel_base, "WakeByAddressSingle");
+                    wake_by_address_t* wbaa = (wake_by_address_t*)boost::winapi::get_proc_address(kernel_base, "WakeByAddressAll");
+
+                    if (BOOST_LIKELY(wbas != NULL && wbaa != NULL))
+                    {
+                        wait_on_address = woa;
+                        wake_by_address_single = wbas;
+                        wake_by_address_all = wbaa;
+                    }
+                }
+            }
+
+            once_flag_operations::store(wait_functions_once_flag.m_flag, 0u, boost::memory_order_release);
+            break;
+        }
+        else if (old_val == 1u)
+        {
+            boost::winapi::SwitchToThread();
+            old_val = once_flag_operations::load(wait_functions_once_flag.m_flag, boost::memory_order_acquire);
+        }
+        else
+        {
+            break;
+        }
+    }
+}
+
+#else // BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM
+
+BOOST_ATOMIC_DECL once_flag wait_functions_once_flag = { 0u };
+
+BOOST_ATOMIC_DECL void initialize_wait_functions() BOOST_NOEXCEPT
+{
+}
+
+#endif // BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#include <boost/atomic/detail/footer.hpp>