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annotate src/share/vm/runtime/atomic.cpp @ 3979:4dfb2df418f2

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6484982: G1: process references during evacuation pauses Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate. Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
author johnc
date Thu, 22 Sep 2011 10:57:37 -0700
parents 7d9e451f5416
children f08d439fab8c
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1 /*
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2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "runtime/atomic.hpp"
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27 #ifdef TARGET_OS_FAMILY_linux
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28 # include "os_linux.inline.hpp"
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29 #endif
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30 #ifdef TARGET_OS_FAMILY_solaris
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31 # include "os_solaris.inline.hpp"
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32 #endif
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33 #ifdef TARGET_OS_FAMILY_windows
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34 # include "os_windows.inline.hpp"
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35 #endif
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36 #ifdef TARGET_OS_ARCH_linux_x86
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37 # include "atomic_linux_x86.inline.hpp"
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38 #endif
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39 #ifdef TARGET_OS_ARCH_linux_sparc
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40 # include "atomic_linux_sparc.inline.hpp"
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41 #endif
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42 #ifdef TARGET_OS_ARCH_linux_zero
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43 # include "atomic_linux_zero.inline.hpp"
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44 #endif
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45 #ifdef TARGET_OS_ARCH_solaris_x86
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46 # include "atomic_solaris_x86.inline.hpp"
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47 #endif
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48 #ifdef TARGET_OS_ARCH_solaris_sparc
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49 # include "atomic_solaris_sparc.inline.hpp"
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50 #endif
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51 #ifdef TARGET_OS_ARCH_windows_x86
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52 # include "atomic_windows_x86.inline.hpp"
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53 #endif
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54 #ifdef TARGET_OS_ARCH_linux_arm
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55 # include "atomic_linux_arm.inline.hpp"
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56 #endif
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57 #ifdef TARGET_OS_ARCH_linux_ppc
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58 # include "atomic_linux_ppc.inline.hpp"
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59 #endif
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61 jbyte Atomic::cmpxchg(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) {
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62 assert(sizeof(jbyte) == 1, "assumption.");
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63 uintptr_t dest_addr = (uintptr_t)dest;
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64 uintptr_t offset = dest_addr % sizeof(jint);
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65 volatile jint* dest_int = (volatile jint*)(dest_addr - offset);
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66 jint cur = *dest_int;
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67 jbyte* cur_as_bytes = (jbyte*)(&cur);
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68 jint new_val = cur;
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69 jbyte* new_val_as_bytes = (jbyte*)(&new_val);
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70 new_val_as_bytes[offset] = exchange_value;
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71 while (cur_as_bytes[offset] == compare_value) {
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72 jint res = cmpxchg(new_val, dest_int, cur);
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73 if (res == cur) break;
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74 cur = res;
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75 new_val = cur;
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76 new_val_as_bytes[offset] = exchange_value;
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77 }
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78 return cur_as_bytes[offset];
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79 }
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81 unsigned Atomic::xchg(unsigned int exchange_value, volatile unsigned int* dest) {
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82 assert(sizeof(unsigned int) == sizeof(jint), "more work to do");
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83 return (unsigned int)Atomic::xchg((jint)exchange_value, (volatile jint*)dest);
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84 }
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86 unsigned Atomic::cmpxchg(unsigned int exchange_value,
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87 volatile unsigned int* dest, unsigned int compare_value) {
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88 assert(sizeof(unsigned int) == sizeof(jint), "more work to do");
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89 return (unsigned int)Atomic::cmpxchg((jint)exchange_value, (volatile jint*)dest,
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90 (jint)compare_value);
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91 }
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92
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93 jlong Atomic::add(jlong add_value, volatile jlong* dest) {
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94 jlong old = load(dest);
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95 jlong new_value = old + add_value;
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96 while (old != cmpxchg(new_value, dest, old)) {
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97 old = load(dest);
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98 new_value = old + add_value;
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99 }
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100 return old;
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101 }