| /* |
| * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved. |
| * Copyright 2007, 2008, 2011, 2015, Red Hat, Inc. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef OS_CPU_LINUX_ZERO_ATOMIC_LINUX_ZERO_HPP |
| #define OS_CPU_LINUX_ZERO_ATOMIC_LINUX_ZERO_HPP |
| |
| #include "runtime/os.hpp" |
| |
| // Implementation of class atomic |
| |
| template<size_t byte_size> |
| struct Atomic::PlatformAdd |
| : Atomic::AddAndFetch<Atomic::PlatformAdd<byte_size> > |
| { |
| template<typename D, typename I> |
| D add_and_fetch(D volatile* dest, I add_value, atomic_memory_order order) const; |
| }; |
| |
| template<> |
| template<typename D, typename I> |
| inline D Atomic::PlatformAdd<4>::add_and_fetch(D volatile* dest, I add_value, |
| atomic_memory_order order) const { |
| STATIC_ASSERT(4 == sizeof(I)); |
| STATIC_ASSERT(4 == sizeof(D)); |
| |
| return __sync_add_and_fetch(dest, add_value); |
| } |
| |
| template<> |
| template<typename D, typename I> |
| inline D Atomic::PlatformAdd<8>::add_and_fetch(D volatile* dest, I add_value, |
| atomic_memory_order order) const { |
| STATIC_ASSERT(8 == sizeof(I)); |
| STATIC_ASSERT(8 == sizeof(D)); |
| return __sync_add_and_fetch(dest, add_value); |
| } |
| |
| template<> |
| template<typename T> |
| inline T Atomic::PlatformXchg<4>::operator()(T volatile* dest, |
| T exchange_value, |
| atomic_memory_order order) const { |
| STATIC_ASSERT(4 == sizeof(T)); |
| // __sync_lock_test_and_set is a bizarrely named atomic exchange |
| // operation. Note that some platforms only support this with the |
| // limitation that the only valid value to store is the immediate |
| // constant 1. There is a test for this in JNI_CreateJavaVM(). |
| T result = __sync_lock_test_and_set (dest, exchange_value); |
| // All atomic operations are expected to be full memory barriers |
| // (see atomic.hpp). However, __sync_lock_test_and_set is not |
| // a full memory barrier, but an acquire barrier. Hence, this added |
| // barrier. |
| __sync_synchronize(); |
| return result; |
| } |
| |
| template<> |
| template<typename T> |
| inline T Atomic::PlatformXchg<8>::operator()(T volatile* dest, |
| T exchange_value, |
| atomic_memory_order order) const { |
| STATIC_ASSERT(8 == sizeof(T)); |
| T result = __sync_lock_test_and_set (dest, exchange_value); |
| __sync_synchronize(); |
| return result; |
| } |
| |
| // No direct support for cmpxchg of bytes; emulate using int. |
| template<> |
| struct Atomic::PlatformCmpxchg<1> : Atomic::CmpxchgByteUsingInt {}; |
| |
| template<> |
| template<typename T> |
| inline T Atomic::PlatformCmpxchg<4>::operator()(T exchange_value, |
| T volatile* dest, |
| T compare_value, |
| atomic_memory_order order) const { |
| STATIC_ASSERT(4 == sizeof(T)); |
| return __sync_val_compare_and_swap(dest, compare_value, exchange_value); |
| } |
| |
| template<> |
| template<typename T> |
| inline T Atomic::PlatformCmpxchg<8>::operator()(T exchange_value, |
| T volatile* dest, |
| T compare_value, |
| atomic_memory_order order) const { |
| STATIC_ASSERT(8 == sizeof(T)); |
| return __sync_val_compare_and_swap(dest, compare_value, exchange_value); |
| } |
| |
| template<> |
| template<typename T> |
| inline T Atomic::PlatformLoad<8>::operator()(T const volatile* src) const { |
| STATIC_ASSERT(8 == sizeof(T)); |
| volatile int64_t dest; |
| os::atomic_copy64(reinterpret_cast<const volatile int64_t*>(src), reinterpret_cast<volatile int64_t*>(&dest)); |
| return PrimitiveConversions::cast<T>(dest); |
| } |
| |
| template<> |
| template<typename T> |
| inline void Atomic::PlatformStore<8>::operator()(T volatile* dest, |
| T store_value) const { |
| STATIC_ASSERT(8 == sizeof(T)); |
| os::atomic_copy64(reinterpret_cast<const volatile int64_t*>(&store_value), reinterpret_cast<volatile int64_t*>(dest)); |
| } |
| |
| #endif // OS_CPU_LINUX_ZERO_ATOMIC_LINUX_ZERO_HPP |