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4363 | Serge | 1 | /* |
2 | * Copyright © 2009 Intel Corporation |
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3 | * |
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4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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5 | * copy of this software and associated documentation files (the "Software"), |
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6 | * to deal in the Software without restriction, including without limitation |
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7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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8 | * and/or sell copies of the Software, and to permit persons to whom the |
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9 | * Software is furnished to do so, subject to the following conditions: |
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10 | * |
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11 | * The above copyright notice and this permission notice (including the next |
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12 | * paragraph) shall be included in all copies or substantial portions of the |
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13 | * Software. |
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14 | * |
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15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
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21 | * IN THE SOFTWARE. |
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22 | * |
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23 | * Authors: |
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24 | * Chris Wilson |
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25 | * |
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26 | */ |
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27 | |||
28 | /** |
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29 | * @file xf86atomics.h |
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30 | * |
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31 | * Private definitions for atomic operations |
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32 | */ |
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33 | |||
34 | #ifndef LIBDRM_ATOMICS_H |
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35 | #define LIBDRM_ATOMICS_H |
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36 | |||
37 | #ifdef HAVE_CONFIG_H |
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38 | #include "config.h" |
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39 | #endif |
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40 | |||
41 | |||
42 | #define HAS_ATOMIC_OPS 1 |
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43 | |||
44 | typedef struct { |
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45 | int atomic; |
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46 | } atomic_t; |
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47 | |||
48 | # define atomic_read(x) ((x)->atomic) |
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49 | # define atomic_set(x, val) ((x)->atomic = (val)) |
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50 | # define atomic_inc(x) ((void) __sync_fetch_and_add (&(x)->atomic, 1)) |
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6110 | serge | 51 | # define atomic_inc_return(x) (__sync_add_and_fetch (&(x)->atomic, 1)) |
52 | # define atomic_dec_and_test(x) (__sync_add_and_fetch (&(x)->atomic, -1) == 0) |
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4363 | Serge | 53 | # define atomic_add(x, v) ((void) __sync_add_and_fetch(&(x)->atomic, (v))) |
54 | # define atomic_dec(x, v) ((void) __sync_sub_and_fetch(&(x)->atomic, (v))) |
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55 | # define atomic_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (&(x)->atomic, oldv, newv) |
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56 | |||
57 | |||
58 | #if HAVE_LIB_ATOMIC_OPS |
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59 | #include |
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60 | |||
61 | #define HAS_ATOMIC_OPS 1 |
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62 | |||
63 | typedef struct { |
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64 | AO_t atomic; |
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65 | } atomic_t; |
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66 | |||
67 | # define atomic_read(x) AO_load_full(&(x)->atomic) |
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68 | # define atomic_set(x, val) AO_store_full(&(x)->atomic, (val)) |
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69 | # define atomic_inc(x) ((void) AO_fetch_and_add1_full(&(x)->atomic)) |
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6110 | serge | 70 | # define atomic_inc_return(x) (AO_fetch_and_add1_full(&(x)->atomic) + 1) |
4363 | Serge | 71 | # define atomic_add(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, (v))) |
72 | # define atomic_dec(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, -(v))) |
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73 | # define atomic_dec_and_test(x) (AO_fetch_and_sub1_full(&(x)->atomic) == 1) |
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74 | # define atomic_cmpxchg(x, oldv, newv) AO_compare_and_swap_full(&(x)->atomic, oldv, newv) |
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75 | |||
76 | #endif |
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77 | |||
6110 | serge | 78 | #if (defined(__sun) || defined(__NetBSD__)) && !defined(HAS_ATOMIC_OPS) /* Solaris & OpenSolaris & NetBSD */ |
4363 | Serge | 79 | |
80 | #include |
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81 | #define HAS_ATOMIC_OPS 1 |
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82 | |||
6110 | serge | 83 | #if defined(__NetBSD__) |
84 | #define LIBDRM_ATOMIC_TYPE int |
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85 | #else |
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86 | #define LIBDRM_ATOMIC_TYPE uint_t |
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87 | #endif |
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4363 | Serge | 88 | |
6110 | serge | 89 | typedef struct { LIBDRM_ATOMIC_TYPE atomic; } atomic_t; |
90 | |||
4363 | Serge | 91 | # define atomic_read(x) (int) ((x)->atomic) |
6110 | serge | 92 | # define atomic_set(x, val) ((x)->atomic = (LIBDRM_ATOMIC_TYPE)(val)) |
4363 | Serge | 93 | # define atomic_inc(x) (atomic_inc_uint (&(x)->atomic)) |
6110 | serge | 94 | # define atomic_inc_return(x) (atomic_inc_uint_nv(&(x)->atomic)) |
95 | # define atomic_dec_and_test(x) (atomic_dec_uint_nv(&(x)->atomic) == 0) |
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4363 | Serge | 96 | # define atomic_add(x, v) (atomic_add_int(&(x)->atomic, (v))) |
97 | # define atomic_dec(x, v) (atomic_add_int(&(x)->atomic, -(v))) |
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98 | # define atomic_cmpxchg(x, oldv, newv) atomic_cas_uint (&(x)->atomic, oldv, newv) |
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99 | |||
100 | #endif |
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101 | |||
102 | #if ! HAS_ATOMIC_OPS |
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103 | #error libdrm requires atomic operations, please define them for your CPU/compiler. |
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104 | #endif |
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105 | |||
6110 | serge | 106 | static inline int atomic_add_unless(atomic_t *v, int add, int unless) |
107 | { |
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108 | int c, old; |
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109 | c = atomic_read(v); |
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110 | while (c != unless && (old = atomic_cmpxchg(v, c, c + add)) != c) |
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111 | c = old; |
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112 | return c == unless; |
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113 | } |
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114 | |||
4363 | Serge | 115 | #endif |