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comparison src/share/vm/runtime/atomic.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1999-2003 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
25 class 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 // Atomically add to a location, return updated value
43 static jint add (jint add_value, volatile jint* dest);
44 static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest);
45 static void* add_ptr(intptr_t add_value, volatile void* dest);
46
47 // Atomically increment location
48 static void inc (volatile jint* dest);
49 static void inc_ptr(volatile intptr_t* dest);
50 static void inc_ptr(volatile void* dest);
51
52 // Atomically decrement a location
53 static void dec (volatile jint* dest);
54 static void dec_ptr(volatile intptr_t* dest);
55 static void dec_ptr(volatile void* dest);
56
57 // Performs atomic exchange of *dest with exchange_value. Returns old prior value of *dest.
58 static jint xchg (jint exchange_value, volatile jint* dest);
59 static intptr_t xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest);
60 static void* xchg_ptr(void* exchange_value, volatile void* dest);
61
62 // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value
63 // if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory
64 // barrier across the cmpxchg. I.e., it's really a 'fence_cmpxchg_acquire'.
65 static jbyte cmpxchg (jbyte exchange_value, volatile jbyte* dest, jbyte compare_value);
66 static jint cmpxchg (jint exchange_value, volatile jint* dest, jint compare_value);
67 static jlong cmpxchg (jlong exchange_value, volatile jlong* dest, jlong compare_value);
68 static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value);
69 static void* cmpxchg_ptr(void* exchange_value, volatile void* dest, void* compare_value);
70 };