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annotate include/SDL_atomic.h @ 3237:916f396fe65d

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Start of redesign, getting rid of 8 and 16 bit operations in .h and test files.
author Bob Pendleton <bob@pendleton.com>
date Tue, 11 Aug 2009 21:27:19 +0000
parents 48a80f2a7ff2
children 72b542f34739
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 /**
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24 * \file SDL_atomic.h
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25 *
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26 * Atomic operations.
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27 */
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28
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29 #ifndef _SDL_atomic_h_
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30 #define _SDL_atomic_h_
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31
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32 #include "SDL_stdinc.h"
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33 #include "SDL_platform.h"
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34
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35 #include "begin_code.h"
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36
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37 /* Set up for C function definitions, even when using C++ */
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38 #ifdef __cplusplus
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39 /* *INDENT-OFF* */
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40 extern "C" {
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41 /* *INDENT-ON* */
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42 #endif
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43
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44 /**
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45 * These operations may, or may not, actually be implemented using
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46 * processor specific atomic operations. When possible they are
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47 * implemented as true processor specific atomic operations. When that
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48 * is not possible the are implemented using locks that *do* use the
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49 * available atomic operations. In rare cases they may be implemented
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50 * using SDL's mutex fuctions.
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51 */
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52
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53 /* Function prototypes */
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54
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55 /* 32 bit atomic operations */
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56
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57 /**
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58 * \fn int SDL_AtomicExchange32(volatile Uint32 * ptr, Uint32 value)
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59 *
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60 * \brief Atomically exchange two 32 bit values.
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61 *
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62 * \return the value point to by ptr.
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63 *
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64 * \param ptr points to the value to be fetched from *ptr.
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65 * \param value is value to be stored at *ptr.
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66 *
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67 * The current value stored at *ptr is returned and it is replaced
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68 * with value. This function can be used to implement SDL_TestThenSet.
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69 *
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70 */
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71 extern DECLSPEC Uint32 SDLCALL SDL_AtomicExchange32(volatile Uint32 * ptr, Uint32 value);
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72
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73 /**
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74 * \fn int SDL_AtomicCompareThenSet32(volatile Uint32 * ptr, Uint32 oldvalue, Uint32 newvalue)
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75 *
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76 * \brief If *ptr == oldvalue then replace the contents of *ptr by new value.
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77 *
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78 * \return true if the newvalue was stored.
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79 *
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80 * \param *ptr is the value to be compared and replaced.
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81 * \param oldvalue is value to be compared to *ptr.
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82 * \param newvalue is value to be stored at *ptr.
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83 *
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84 */
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85 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet32(volatile Uint32 * ptr,
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86 Uint32 oldvalue, Uint32 newvalue);
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87 /**
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88 * \fn SDL_bool SDL_AtomicTestThenSet32(volatile Uint32 * ptr);
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89 *
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90 * \brief Check to see if *ptr == 0 and set it to non-zero.
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91 *
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92 * \return SDL_True if the value pointed to by ptr was zero and
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93 * SDL_False if it was not zero
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94 *
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95 * \param ptr points to the value to be tested and set.
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96 *
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97 */
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98 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet32(volatile Uint32 * ptr);
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99
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100 /**
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101 * \fn void SDL_AtomicClear32(volatile Uint32 * ptr);
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102 *
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103 * \brief set the value pointed to by ptr to be zero.
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104 *
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105 * \param ptr address of the value to be set to zero
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106 *
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107 */
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108 extern DECLSPEC void SDLCALL SDL_AtomicClear32(volatile Uint32 * ptr);
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109
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110 /**
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111 * \fn Uint32 SDL_AtomicFetchThenIncrement32(volatile Uint32 * ptr);
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112 *
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113 * \brief fetch the current value of *ptr and then increment that
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114 * value in place.
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115 *
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116 * \return the value before it was incremented.
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117 *
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118 * \param ptr address of the value to fetch and increment
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119 *
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120 */
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121 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenIncrement32(volatile Uint32 * ptr);
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122
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123 /**
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124 * \fn Uint32 SDL_AtomicFetchThenDecrement32(volatile Uint32 * ptr);
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125 *
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126 * \brief fetch *ptr and then decrement the value in place.
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127 *
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128 * \return the value before it was decremented.
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129 *
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130 * \param ptr address of the value to fetch and drement
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131 *
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132 */
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133 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenDecrement32(volatile Uint32 * ptr);
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134
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135 /**
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136 * \fn Uint32 SDL_AtomicFetchThenAdd32(volatile Uint32 * ptr, Uint32 value);
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137 *
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138 * \brief fetch the current value at ptr and then add value to *ptr.
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139 *
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140 * \return *ptr before the addition took place.
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141 *
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142 * \param ptr the address of data we are changing.
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143 * \param value the value to add to *ptr.
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144 *
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145 */
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146 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenAdd32(volatile Uint32 * ptr, Uint32 value);
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147
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148 /**
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149 * \fn Uint32 SDL_AtomicFetchThenSubtract32(volatile Uint32 * ptr, Uint32 value);
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150 *
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151 * \brief Fetch *ptr and then subtract value from it.
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152 *
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153 * \return *ptr before the subtraction took place.
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154 *
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155 * \param ptr the address of the data being changed.
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156 * \param value the value to subtract from *ptr.
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157 *
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158 */
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159 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenSubtract32(volatile Uint32 * ptr, Uint32 value);
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160
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161 /**
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162 * \fn Uint32 SDL_AtomicIncrementThenFetch32(volatile Uint32 * ptr);
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163 *
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164 * \brief Add one to the data pointed to by ptr and return that value.
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165 *
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166 * \return the incremented value.
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167 *
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168 * \param ptr address of the data to increment.
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169 *
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170 */
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171 extern DECLSPEC Uint32 SDLCALL SDL_AtomicIncrementThenFetch32(volatile Uint32 * ptr);
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172
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173 /**
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174 * \fn Uint32 SDL_AtomicDecrementThenFetch32(volatile Uint32 * ptr);
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175 *
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176 * \brief Subtract one from data pointed to by ptr and return the new value.
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177 *
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178 * \return The decremented value.
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179 *
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180 * \param ptr The address of the data to decrement.
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181 *
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182 */
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183 extern DECLSPEC Uint32 SDLCALL SDL_AtomicDecrementThenFetch32(volatile Uint32 * ptr);
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184
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185 /**
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186 * \fn Uint32 SDL_AtomicAddThenFetch32(volatile Uint32 * ptr, Uint32 value);
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187 *
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188 * \brief Add value to the data pointed to by ptr and return result.
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189 *
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190 * \return The sum of *ptr and value.
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191 *
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192 * \param ptr The address of the data to be modified.
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193 * \param value The value to be added.
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194 *
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195 */
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196 extern DECLSPEC Uint32 SDLCALL SDL_AtomicAddThenFetch32(volatile Uint32 * ptr, Uint32 value);
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197
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198 /**
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199 * \fn Uint32 SDL_AtomicSubtractThenFetch32(volatile Uint32 * ptr, Uint32 value);
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200 *
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201 * \brief Subtract value from the data pointed to by ptr and return the result.
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202 *
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203 * \return the difference between *ptr and value.
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204 *
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205 * \param ptr The address of the data to be modified.
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206 * \param value The value to be subtracted.
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207 *
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208 */
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209 extern DECLSPEC Uint32 SDLCALL SDL_AtomicSubtractThenFetch32(volatile Uint32 * ptr, Uint32 value);
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210
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211 /* 64 bit atomic operations */
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212 #ifdef SDL_HAS_64BIT_TYPE
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213
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214 extern DECLSPEC Uint64 SDLCALL SDL_AtomicExchange64(volatile Uint64 * ptr, Uint64 value);
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215 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet64(volatile Uint64 * ptr,
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216 Uint64 oldvalue, Uint64 newvalue);
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217 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet64(volatile Uint64 * ptr);
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218 extern DECLSPEC void SDLCALL SDL_AtomicClear64(volatile Uint64 * ptr);
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219 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenIncrement64(volatile Uint64 * ptr);
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220 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenDecrement64(volatile Uint64 * ptr);
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221 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenAdd64(volatile Uint64 * ptr, Uint64 value);
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222 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenSubtract64(volatile Uint64 * ptr, Uint64 value);
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223 extern DECLSPEC Uint64 SDLCALL SDL_AtomicIncrementThenFetch64(volatile Uint64 * ptr);
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224 extern DECLSPEC Uint64 SDLCALL SDL_AtomicDecrementThenFetch64(volatile Uint64 * ptr);
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225 extern DECLSPEC Uint64 SDLCALL SDL_AtomicAddThenFetch64(volatile Uint64 * ptr, Uint64 value);
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226 extern DECLSPEC Uint64 SDLCALL SDL_AtomicSubtractThenFetch64(volatile Uint64 * ptr, Uint64 value);
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227 #endif /* SDL_HAS_64BIT_TYPE */
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228
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229 /* Ends C function definitions when using C++ */
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230 #ifdef __cplusplus
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231 /* *INDENT-OFF* */
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232 }
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233 /* *INDENT-ON* */
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234 #endif
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235
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236 #include "close_code.h"
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237
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238 #endif /* _SDL_atomic_h_ */
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239
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240 /* vi: set ts=4 sw=4 expandtab: */