atomic.hpp revision 1879:f95d63e2154a 
1/*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
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24
25#ifndef SHARE_VM_RUNTIME_ATOMIC_HPP
26#define SHARE_VM_RUNTIME_ATOMIC_HPP
27
28#include "memory/allocation.hpp"
29
30class Atomic : AllStatic {
31 public:
32  // Atomically store to a location
33  static void store    (jbyte    store_value, jbyte*    dest);
34  static void store    (jshort   store_value, jshort*   dest);
35  static void store    (jint     store_value, jint*     dest);
36  static void store    (jlong    store_value, jlong*    dest);
37  static void store_ptr(intptr_t store_value, intptr_t* dest);
38  static void store_ptr(void*    store_value, void*     dest);
39
40  static void store    (jbyte    store_value, volatile jbyte*    dest);
41  static void store    (jshort   store_value, volatile jshort*   dest);
42  static void store    (jint     store_value, volatile jint*     dest);
43  static void store    (jlong    store_value, volatile jlong*    dest);
44  static void store_ptr(intptr_t store_value, volatile intptr_t* dest);
45  static void store_ptr(void*    store_value, volatile void*     dest);
46
47  static jlong load(volatile jlong* src);
48
49  // Atomically add to a location, return updated value
50  static jint     add    (jint     add_value, volatile jint*     dest);
51  static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest);
52  static void*    add_ptr(intptr_t add_value, volatile void*     dest);
53
54  // Atomically increment location
55  static void inc    (volatile jint*     dest);
56  static void inc_ptr(volatile intptr_t* dest);
57  static void inc_ptr(volatile void*     dest);
58
59  // Atomically decrement a location
60  static void dec    (volatile jint*     dest);
61  static void dec_ptr(volatile intptr_t* dest);
62  static void dec_ptr(volatile void*     dest);
63
64  // Performs atomic exchange of *dest with exchange_value.  Returns old prior value of *dest.
65  static jint         xchg(jint     exchange_value, volatile jint*     dest);
66  static unsigned int xchg(unsigned int exchange_value,
67                           volatile unsigned int* dest);
68
69  static intptr_t xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest);
70  static void*    xchg_ptr(void*    exchange_value, volatile void*   dest);
71
72  // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value
73  // if the comparison succeeded.  Returns prior value of *dest.  Guarantees a two-way memory
74  // barrier across the cmpxchg.  I.e., it's really a 'fence_cmpxchg_acquire'.
75  static jbyte    cmpxchg    (jbyte    exchange_value, volatile jbyte*    dest, jbyte    compare_value);
76  static jint     cmpxchg    (jint     exchange_value, volatile jint*     dest, jint     compare_value);
77  static jlong    cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value);
78
79  static unsigned int cmpxchg(unsigned int exchange_value,
80                              volatile unsigned int* dest,
81                              unsigned int compare_value);
82
83  static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value);
84  static void*    cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value);
85};
86
87#endif // SHARE_VM_RUNTIME_ATOMIC_HPP
88