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annotate src/share/vm/runtime/atomic.hpp @ 18096:ca6d25be853b jdk8u25-b13

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8044269: Analysis of archive files. Summary: Add checksum verification. Reviewed-by: iklam, dholmes, mschoene
author jiangli
date Tue, 12 Aug 2014 17:46:16 -0400
parents 55fb97c4c58d
children 4ca6dc0799b6
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1 /*
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2 * Copyright (c) 1999, 2013, 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 #ifndef SHARE_VM_RUNTIME_ATOMIC_HPP
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26 #define SHARE_VM_RUNTIME_ATOMIC_HPP
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27
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28 #include "memory/allocation.hpp"
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29
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30 class Atomic : AllStatic {
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31 public:
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32 // Atomic operations on jlong types are not available on all 32-bit
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33 // platforms. If atomic ops on jlongs are defined here they must only
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34 // be used from code that verifies they are available at runtime and
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35 // can provide an alternative action if not - see supports_cx8() for
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36 // a means to test availability.
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37
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38 // Atomically store to a location
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39 inline static void store (jbyte store_value, jbyte* dest);
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40 inline static void store (jshort store_value, jshort* dest);
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41 inline static void store (jint store_value, jint* dest);
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42 // See comment above about using jlong atomics on 32-bit platforms
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43 inline static void store (jlong store_value, jlong* dest);
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44 inline static void store_ptr(intptr_t store_value, intptr_t* dest);
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45 inline static void store_ptr(void* store_value, void* dest);
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47 inline static void store (jbyte store_value, volatile jbyte* dest);
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48 inline static void store (jshort store_value, volatile jshort* dest);
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49 inline static void store (jint store_value, volatile jint* dest);
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50 // See comment above about using jlong atomics on 32-bit platforms
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51 inline static void store (jlong store_value, volatile jlong* dest);
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52 inline static void store_ptr(intptr_t store_value, volatile intptr_t* dest);
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53 inline static void store_ptr(void* store_value, volatile void* dest);
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54
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55 // See comment above about using jlong atomics on 32-bit platforms
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56 inline static jlong load(volatile jlong* src);
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57
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58 // Atomically add to a location, return updated value
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59 inline static jint add (jint add_value, volatile jint* dest);
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60 inline static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest);
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61 inline static void* add_ptr(intptr_t add_value, volatile void* dest);
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62 // See comment above about using jlong atomics on 32-bit platforms
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63 static jlong add (jlong add_value, volatile jlong* dest);
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64
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65 // Atomically increment location
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66 inline static void inc (volatile jint* dest);
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67 static void inc (volatile jshort* dest);
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68 inline static void inc_ptr(volatile intptr_t* dest);
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69 inline static void inc_ptr(volatile void* dest);
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71 // Atomically decrement a location
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72 inline static void dec (volatile jint* dest);
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73 static void dec (volatile jshort* dest);
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74 inline static void dec_ptr(volatile intptr_t* dest);
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75 inline static void dec_ptr(volatile void* dest);
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77 // Performs atomic exchange of *dest with exchange_value. Returns old prior value of *dest.
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78 inline static jint xchg(jint exchange_value, volatile jint* dest);
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79 static unsigned int xchg(unsigned int exchange_value, volatile unsigned int* dest);
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81 inline static intptr_t xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest);
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82 inline static void* xchg_ptr(void* exchange_value, volatile void* dest);
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83
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84 // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value
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85 // if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory
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86 // barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'.
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87 static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value);
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88 inline static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value);
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89 // See comment above about using jlong atomics on 32-bit platforms
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90 inline static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value);
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91
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92 static unsigned int cmpxchg(unsigned int exchange_value,
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93 volatile unsigned int* dest,
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94 unsigned int compare_value);
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95
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96 inline static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value);
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97 inline static void* cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value);
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98 };
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99
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100 // To use Atomic::inc(jshort* dest) and Atomic::dec(jshort* dest), the address must be specially
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101 // aligned, such that (*dest) occupies the upper 16 bits of an aligned 32-bit word. The best way to
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102 // achieve is to place your short value next to another short value, which doesn't need atomic ops.
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103 //
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104 // Example
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105 // ATOMIC_SHORT_PAIR(
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106 // volatile short _refcount, // needs atomic operation
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107 // unsigned short _length // number of UTF8 characters in the symbol (does not need atomic op)
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108 // );
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109
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110 #ifdef VM_LITTLE_ENDIAN
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111 #define ATOMIC_SHORT_PAIR(atomic_decl, non_atomic_decl) \
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112 non_atomic_decl; \
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113 atomic_decl
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114 #else
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115 #define ATOMIC_SHORT_PAIR(atomic_decl, non_atomic_decl) \
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116 atomic_decl ; \
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117 non_atomic_decl
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118 #endif
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119
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120 #endif // SHARE_VM_RUNTIME_ATOMIC_HPP