Mon, 25 Jan 2010 18:03:29 -0500
6919980: G1: remove +UseG1GC from under experimental options (second attempt)
Summary: Trying this again, as the original change was lost.
Reviewed-by: ysr, jmasa
duke@435 | 1 | /* |
xdono@631 | 2 | * Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_atomic.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | jbyte Atomic::cmpxchg(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) { |
duke@435 | 29 | assert(sizeof(jbyte) == 1, "assumption."); |
duke@435 | 30 | uintptr_t dest_addr = (uintptr_t)dest; |
duke@435 | 31 | uintptr_t offset = dest_addr % sizeof(jint); |
duke@435 | 32 | volatile jint* dest_int = (volatile jint*)(dest_addr - offset); |
duke@435 | 33 | jint cur = *dest_int; |
duke@435 | 34 | jbyte* cur_as_bytes = (jbyte*)(&cur); |
duke@435 | 35 | jint new_val = cur; |
duke@435 | 36 | jbyte* new_val_as_bytes = (jbyte*)(&new_val); |
duke@435 | 37 | new_val_as_bytes[offset] = exchange_value; |
duke@435 | 38 | while (cur_as_bytes[offset] == compare_value) { |
duke@435 | 39 | jint res = cmpxchg(new_val, dest_int, cur); |
duke@435 | 40 | if (res == cur) break; |
duke@435 | 41 | cur = res; |
duke@435 | 42 | new_val = cur; |
duke@435 | 43 | new_val_as_bytes[offset] = exchange_value; |
duke@435 | 44 | } |
duke@435 | 45 | return cur_as_bytes[offset]; |
duke@435 | 46 | } |
coleenp@548 | 47 | |
coleenp@548 | 48 | unsigned Atomic::xchg(unsigned int exchange_value, volatile unsigned int* dest) { |
coleenp@548 | 49 | assert(sizeof(unsigned int) == sizeof(jint), "more work to do"); |
coleenp@548 | 50 | return (unsigned int)Atomic::xchg((jint)exchange_value, (volatile jint*)dest); |
coleenp@548 | 51 | } |
coleenp@548 | 52 | |
coleenp@548 | 53 | unsigned Atomic::cmpxchg(unsigned int exchange_value, |
coleenp@548 | 54 | volatile unsigned int* dest, unsigned int compare_value) { |
coleenp@548 | 55 | assert(sizeof(unsigned int) == sizeof(jint), "more work to do"); |
coleenp@548 | 56 | return (unsigned int)Atomic::cmpxchg((jint)exchange_value, (volatile jint*)dest, |
coleenp@548 | 57 | (jint)compare_value); |
coleenp@548 | 58 | } |