Mercurial > hg > truffle
annotate src/share/vm/runtime/atomic.hpp @ 9093:cd22923e7ca7
removed unnecessary code
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 12 Apr 2013 21:35:27 +0200 |
parents | 0598674c0056 |
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rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_ATOMIC_HPP |
26 #define SHARE_VM_RUNTIME_ATOMIC_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 | |
0 | 30 class Atomic : AllStatic { |
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 |
0 | 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); |
0 | 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); |
0 | 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 |
0 | 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 |
0 | 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); |
0 | 69 |
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); |
0 | 74 |
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); |
0 | 81 |
82 // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value | |
83 // if the comparison succeeded. Returns prior value of *dest. Guarantees a two-way memory | |
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); |
0 | 96 }; |
1972 | 97 |
98 #endif // SHARE_VM_RUNTIME_ATOMIC_HPP |