atomic.hpp revision 894:665be97e8704 
1/*
2 * Copyright 1999-2008 Sun Microsystems, Inc.  All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
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
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25class Atomic : AllStatic {
26 public:
27  // Atomically store to a location
28  static void store    (jbyte    store_value, jbyte*    dest);
29  static void store    (jshort   store_value, jshort*   dest);
30  static void store    (jint     store_value, jint*     dest);
31  static void store    (jlong    store_value, jlong*    dest);
32  static void store_ptr(intptr_t store_value, intptr_t* dest);
33  static void store_ptr(void*    store_value, void*     dest);
34
35  static void store    (jbyte    store_value, volatile jbyte*    dest);
36  static void store    (jshort   store_value, volatile jshort*   dest);
37  static void store    (jint     store_value, volatile jint*     dest);
38  static void store    (jlong    store_value, volatile jlong*    dest);
39  static void store_ptr(intptr_t store_value, volatile intptr_t* dest);
40  static void store_ptr(void*    store_value, volatile void*     dest);
41
42  static jlong load(volatile jlong* src);
43
44  // Atomically add to a location, return updated value
45  static jint     add    (jint     add_value, volatile jint*     dest);
46  static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest);
47  static void*    add_ptr(intptr_t add_value, volatile void*     dest);
48
49  // Atomically increment location
50  static void inc    (volatile jint*     dest);
51  static void inc_ptr(volatile intptr_t* dest);
52  static void inc_ptr(volatile void*     dest);
53
54  // Atomically decrement a location
55  static void dec    (volatile jint*     dest);
56  static void dec_ptr(volatile intptr_t* dest);
57  static void dec_ptr(volatile void*     dest);
58
59  // Performs atomic exchange of *dest with exchange_value.  Returns old prior value of *dest.
60  static jint         xchg(jint     exchange_value, volatile jint*     dest);
61  static unsigned int xchg(unsigned int exchange_value,
62                           volatile unsigned int* dest);
63
64  static intptr_t xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest);
65  static void*    xchg_ptr(void*    exchange_value, volatile void*   dest);
66
67  // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value
68  // if the comparison succeeded.  Returns prior value of *dest.  Guarantees a two-way memory
69  // barrier across the cmpxchg.  I.e., it's really a 'fence_cmpxchg_acquire'.
70  static jbyte    cmpxchg    (jbyte    exchange_value, volatile jbyte*    dest, jbyte    compare_value);
71  static jint     cmpxchg    (jint     exchange_value, volatile jint*     dest, jint     compare_value);
72  static jlong    cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value);
73
74  static unsigned int cmpxchg(unsigned int exchange_value,
75                              volatile unsigned int* dest,
76                              unsigned int compare_value);
77
78  static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value);
79  static void*    cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value);
80};
81