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annotate src/atomic/linux/SDL_atomic.c @ 3200:ef2c029a3a9d

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First draft of atomic operations code for GCC and linux.
author Bob Pendleton <bob@pendleton.com>
date Wed, 24 Jun 2009 20:20:57 +0000
parents 3e1bf2b8bd81
children c297230efc75
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SDL_ATOMIC_LINUX
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24
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25 #include "SDL.h"
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26 #include "SDL_config.h"
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27 #include "SDL_atomic.h"
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28
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29 Uint32
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30 SDL_AtomicExchange32(Uint32 * ptr, Uint32 value)
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31 {
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32 return __sync_lock_test_and_set(ptr, value);
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33 }
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34
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35 SDL_bool
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36 SDL_AtomicCompareThenSet32(Uint32 * ptr, Uint32 oldvalue, Uint32 newvalue)
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37 {
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38 return (SDL_bool)__sync_bool_compare_and_swap(ptr, oldvalue, newvalue);
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39 }
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40
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41 SDL_bool
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42 SDL_AtomicTestThenSet32(Uint32 * ptr)
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43 {
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44 return (SDL_bool)(0 == __sync_lock_test_and_set(ptr, 1));
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45 }
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46
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47 void
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48 SDL_AtomicClear32(Uint32 * ptr)
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49 {
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50 __sync_lock_release(ptr);
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51 }
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52
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53 Uint32
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54 SDL_AtomicFetchThenIncrement32(Uint32 * ptr)
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55 {
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56 return __sync_fetch_and_add(ptr, 1);
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57 }
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58
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59 Uint32
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60 SDL_AtomicFetchThenDecrement32(Uint32 * ptr)
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61 {
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62 return __sync_fetch_and_sub(ptr, 1);
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63 }
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64
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65 Uint32
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66 SDL_AtomicFetchThenAdd32(Uint32 * ptr, Uint32 value)
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67 {
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68 return __sync_fetch_and_add(ptr, value);
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69 }
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70
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71 Uint32
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72 SDL_AtomicFetchThenSubtract32(Uint32 * ptr, Uint32 value)
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73 {
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74 return __sync_fetch_and_sub(ptr, value);
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75 }
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76
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77 Uint32
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78 SDL_AtomicIncrementThenFetch32(Uint32 * ptr)
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79 {
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80 return __sync_add_and_fetch(ptr, 1);
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81 }
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82
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83 Uint32
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84 SDL_AtomicDecrementThenFetch32(Uint32 * ptr)
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85 {
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86 return __sync_sub_and_fetch(ptr, 1);
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87 }
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88
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89 Uint32
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90 SDL_AtomicAddThenFetch32(Uint32 * ptr, Uint32 value)
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91 {
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92 return __sync_add_and_fetch(ptr, value);
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93 }
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94
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95 Uint32
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96 SDL_AtomicSubtractThenFetch32(Uint32 * ptr, Uint32 value)
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97 {
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98 return __sync_sub_and_fetch(ptr, value);
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99 }
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100
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101 #ifdef SDL_HAS_64BIT_TYPE
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102
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103 Uint64
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104 SDL_AtomicExchange64(Uint64 * ptr, Uint64 value)
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105 {
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106 return __sync_lock_test_and_set(ptr, value);
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107 }
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108
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109 SDL_bool
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110 SDL_AtomicCompareThenSet64(Uint64 * ptr, Uint64 oldvalue, Uint64 newvalue)
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111 {
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112 return (SDL_bool)__sync_bool_compare_and_swap(ptr, oldvalue, newvalue);
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113 }
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114
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115 SDL_bool
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116 SDL_AtomicTestThenSet64(Uint64 * ptr)
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117 {
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118 return (SDL_bool)(0 == __sync_lock_test_and_set(ptr, 1));
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119 }
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120
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121 void
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122 SDL_AtomicClear64(Uint64 * ptr)
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123 {
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124 __sync_lock_release(ptr);
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125 }
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126
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127 Uint64
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128 SDL_AtomicFetchThenIncrement64(Uint64 * ptr)
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129 {
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130 return __sync_fetch_and_add(ptr, 1);
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131 }
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132
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133 Uint64
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134 SDL_AtomicFetchThenDecrement64(Uint64 * ptr)
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135 {
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136 return __sync_fetch_and_sub(ptr, 1);
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137 }
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138
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139 Uint64
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140 SDL_AtomicFetchThenAdd64(Uint64 * ptr, Uint64 value)
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141 {
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142 return __sync_fetch_and_add(ptr, value);
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143 }
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144
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145 Uint64
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146 SDL_AtomicFetchThenSubtract64(Uint64 * ptr, Uint64 value)
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147 {
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148 return __sync_fetch_and_sub(ptr, value);
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149 }
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150
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151 Uint64
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152 SDL_AtomicIncrementThenFetch64(Uint64 * ptr)
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153 {
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154 return __sync_add_and_fetch(ptr, 1);
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155 }
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156
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157 Uint64
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158 SDL_AtomicDecrementThenFetch64(Uint64 * ptr)
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159 {
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160 return __sync_sub_and_fetch(ptr, 1);
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161 }
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162
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163 Uint64
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164 SDL_AtomicAddThenFetch64(Uint64 * ptr, Uint64 value)
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165 {
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166 return __sync_add_and_fetch(ptr, value);
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167 }
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168
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169 Uint64
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170 SDL_AtomicSubtractThenFetch64(Uint64 * ptr, Uint64 value)
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171 {
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172 return __sync_sub_and_fetch(ptr, value);
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173 }
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174 #endif
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175 #endif