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annotate src/share/vm/runtime/atomic.hpp @ 8804:91bf0bdae37b

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8008217: CDS: Class data sharing limits the malloc heap on Solaris Summary: In 64bit VM move CDS archive address to 32G on all platforms using new flag SharedBaseAddress. In 32bit VM set CDS archive address to 3Gb on Linux and let other OSs pick the address. Reviewed-by: kvn, dcubed, zgu, hseigel
author coleenp
date Wed, 20 Mar 2013 08:04:54 -0400
parents 0598674c0056
children d9eed26d638a
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1 /*
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2 * Copyright (c) 1999, 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 #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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46
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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 inline static void inc_ptr(volatile intptr_t* dest);
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68 inline static void inc_ptr(volatile void* dest);
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70 // Atomically decrement a location
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71 inline static void dec (volatile jint* dest);
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72 inline static void dec_ptr(volatile intptr_t* dest);
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73 inline static void dec_ptr(volatile void* dest);
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75 // Performs atomic exchange of *dest with exchange_value. Returns old prior value of *dest.
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76 inline static jint xchg(jint exchange_value, volatile jint* dest);
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77 static unsigned int xchg(unsigned int exchange_value, volatile unsigned int* dest);
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78
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79 inline static intptr_t xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest);
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80 inline static void* xchg_ptr(void* exchange_value, volatile void* dest);
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82 // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value
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83 // if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory
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84 // barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'.
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85 static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value);
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86 inline static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value);
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87 // See comment above about using jlong atomics on 32-bit platforms
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88 inline static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value);
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89
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90 static unsigned int cmpxchg(unsigned int exchange_value,
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91 volatile unsigned int* dest,
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92 unsigned int compare_value);
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93
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94 inline static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value);
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95 inline static void* cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value);
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96 };
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98 #endif // SHARE_VM_RUNTIME_ATOMIC_HPP