Added thirdparty: boost library

thirdparty/include/boost/atomic/detail/wait_ops_freebsd_umtx.hpp

@@ -0,0 +1,119 @@
+/*
+ * 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   atomic/detail/wait_ops_freebsd_umtx.hpp
+ *
+ * This header contains implementation of the waiting/notifying atomic operations based on FreeBSD _umtx_op syscall.
+ * https://www.freebsd.org/cgi/man.cgi?query=_umtx_op&apropos=0&sektion=2&manpath=FreeBSD+11-current&format=html
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_WAIT_OPS_FREEBSD_UMTX_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_WAIT_OPS_FREEBSD_UMTX_HPP_INCLUDED_
+
+#include <sys/types.h>
+#include <sys/umtx.h>
+#include <cstddef>
+#include <boost/memory_order.hpp>
+#include <boost/atomic/detail/config.hpp>
+#include <boost/atomic/detail/int_sizes.hpp>
+#include <boost/atomic/detail/wait_operations_fwd.hpp>
+#include <boost/atomic/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+namespace atomics {
+namespace detail {
+
+#if defined(UMTX_OP_WAIT_UINT) || defined(UMTX_OP_WAIT)
+
+template< typename Base >
+struct wait_operations_freebsd_umtx_common :
+    public Base
+{
+    typedef Base base_type;
+    typedef typename base_type::storage_type storage_type;
+
+    static BOOST_CONSTEXPR_OR_CONST bool always_has_native_wait_notify = true;
+
+    static BOOST_FORCEINLINE bool has_native_wait_notify(storage_type const volatile&) BOOST_NOEXCEPT
+    {
+        return true;
+    }
+
+    static BOOST_FORCEINLINE void notify_one(storage_type volatile& storage) BOOST_NOEXCEPT
+    {
+        ::_umtx_op(const_cast< storage_type* >(&storage), UMTX_OP_WAKE, 1u, NULL, NULL);
+    }
+
+    static BOOST_FORCEINLINE void notify_all(storage_type volatile& storage) BOOST_NOEXCEPT
+    {
+        ::_umtx_op(const_cast< storage_type* >(&storage), UMTX_OP_WAKE, (~static_cast< unsigned int >(0u)) >> 1, NULL, NULL);
+    }
+};
+
+#endif // defined(UMTX_OP_WAIT_UINT) || defined(UMTX_OP_WAIT)
+
+// UMTX_OP_WAIT_UINT only appeared in FreeBSD 8.0
+#if defined(UMTX_OP_WAIT_UINT) && BOOST_ATOMIC_DETAIL_SIZEOF_INT < BOOST_ATOMIC_DETAIL_SIZEOF_LONG
+
+template< typename Base, bool Interprocess >
+struct wait_operations< Base, sizeof(unsigned int), true, Interprocess > :
+    public wait_operations_freebsd_umtx_common< Base >
+{
+    typedef wait_operations_freebsd_umtx_common< Base > base_type;
+    typedef typename base_type::storage_type storage_type;
+
+    static BOOST_FORCEINLINE storage_type wait(storage_type const volatile& storage, storage_type old_val, memory_order order) BOOST_NOEXCEPT
+    {
+        storage_type new_val = base_type::load(storage, order);
+        while (new_val == old_val)
+        {
+            ::_umtx_op(const_cast< storage_type* >(&storage), UMTX_OP_WAIT_UINT, old_val, NULL, NULL);
+            new_val = base_type::load(storage, order);
+        }
+
+        return new_val;
+    }
+};
+
+#endif // defined(UMTX_OP_WAIT_UINT) && BOOST_ATOMIC_DETAIL_SIZEOF_INT < BOOST_ATOMIC_DETAIL_SIZEOF_LONG
+
+#if defined(UMTX_OP_WAIT)
+
+template< typename Base, bool Interprocess >
+struct wait_operations< Base, sizeof(unsigned long), true, Interprocess > :
+    public wait_operations_freebsd_umtx_common< Base >
+{
+    typedef wait_operations_freebsd_umtx_common< Base > base_type;
+    typedef typename base_type::storage_type storage_type;
+
+    static BOOST_FORCEINLINE storage_type wait(storage_type const volatile& storage, storage_type old_val, memory_order order) BOOST_NOEXCEPT
+    {
+        storage_type new_val = base_type::load(storage, order);
+        while (new_val == old_val)
+        {
+            ::_umtx_op(const_cast< storage_type* >(&storage), UMTX_OP_WAIT, old_val, NULL, NULL);
+            new_val = base_type::load(storage, order);
+        }
+
+        return new_val;
+    }
+};
+
+#endif // defined(UMTX_OP_WAIT)
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#include <boost/atomic/detail/footer.hpp>
+
+#endif // BOOST_ATOMIC_DETAIL_WAIT_OPS_FREEBSD_UMTX_HPP_INCLUDED_