author | zgu |
Fri, 25 Jan 2013 10:04:08 -0500 | |
changeset 15432 | 9d976ca484d8 |
parent 14626 | 0cf4eccf130f |
child 18438 | 9ea6bbfe0b83 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "runtime/atomic.hpp" |
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#ifdef TARGET_OS_FAMILY_linux |
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# include "os_linux.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_solaris |
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# include "os_solaris.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_windows |
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# include "os_windows.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_bsd |
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# include "os_bsd.inline.hpp" |
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#endif |
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#include "runtime/atomic.inline.hpp" |
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jbyte Atomic::cmpxchg(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) { |
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assert(sizeof(jbyte) == 1, "assumption."); |
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uintptr_t dest_addr = (uintptr_t)dest; |
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uintptr_t offset = dest_addr % sizeof(jint); |
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volatile jint* dest_int = (volatile jint*)(dest_addr - offset); |
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jint cur = *dest_int; |
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jbyte* cur_as_bytes = (jbyte*)(&cur); |
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jint new_val = cur; |
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jbyte* new_val_as_bytes = (jbyte*)(&new_val); |
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new_val_as_bytes[offset] = exchange_value; |
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while (cur_as_bytes[offset] == compare_value) { |
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jint res = cmpxchg(new_val, dest_int, cur); |
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if (res == cur) break; |
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cur = res; |
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new_val = cur; |
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new_val_as_bytes[offset] = exchange_value; |
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} |
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return cur_as_bytes[offset]; |
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} |
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unsigned Atomic::xchg(unsigned int exchange_value, volatile unsigned int* dest) { |
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assert(sizeof(unsigned int) == sizeof(jint), "more work to do"); |
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return (unsigned int)Atomic::xchg((jint)exchange_value, (volatile jint*)dest); |
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} |
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unsigned Atomic::cmpxchg(unsigned int exchange_value, |
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volatile unsigned int* dest, unsigned int compare_value) { |
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assert(sizeof(unsigned int) == sizeof(jint), "more work to do"); |
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return (unsigned int)Atomic::cmpxchg((jint)exchange_value, (volatile jint*)dest, |
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(jint)compare_value); |
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} |
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jlong Atomic::add(jlong add_value, volatile jlong* dest) { |
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jlong old = load(dest); |
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jlong new_value = old + add_value; |
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while (old != cmpxchg(new_value, dest, old)) { |
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old = load(dest); |
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new_value = old + add_value; |
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} |
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return old; |
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} |