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annotate include/SDL_atomic.h @ 3213:1f0f9172a1ff

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Documentation fix.
author Bob Pendleton <bob@pendleton.com>
date Mon, 06 Jul 2009 21:48:52 +0000
parents 3aa519a5c676
children 48a80f2a7ff2
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 /* 8 bit atomic operations */
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56
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57 extern DECLSPEC Uint8 SDLCALL SDL_AtomicExchange8(Uint8 * ptr, Uint8 value);
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58 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet8(Uint8 * ptr,
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59 Uint8 oldvalue, Uint8 newvalue);
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60 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet8(Uint8 * ptr);
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61 extern DECLSPEC void SDLCALL SDL_AtomicClear8(Uint8 * ptr);
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62 extern DECLSPEC Uint8 SDLCALL SDL_AtomicFetchThenIncrement8(Uint8 * ptr);
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63 extern DECLSPEC Uint8 SDLCALL SDL_AtomicFetchThenDecrement8(Uint8 * ptr);
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64 extern DECLSPEC Uint8 SDLCALL SDL_AtomicFetchThenAdd8(Uint8 * ptr, Uint8 value);
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65 extern DECLSPEC Uint8 SDLCALL SDL_AtomicFetchThenSubtract8(Uint8 * ptr, Uint8 value);
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66 extern DECLSPEC Uint8 SDLCALL SDL_AtomicIncrementThenFetch8(Uint8 * ptr);
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67 extern DECLSPEC Uint8 SDLCALL SDL_AtomicDecrementThenFetch8(Uint8 * ptr);
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68 extern DECLSPEC Uint8 SDLCALL SDL_AtomicAddThenFetch8(Uint8 * ptr, Uint8 value);
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69 extern DECLSPEC Uint8 SDLCALL SDL_AtomicSubtractThenFetch8(Uint8 * ptr, Uint8 value);
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70
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71 /* 16 bit atomic operations */
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72
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73 extern DECLSPEC Uint16 SDLCALL SDL_AtomicExchange16(Uint16 * ptr, Uint16 value);
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74 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet16(Uint16 * ptr,
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75 Uint16 oldvalue, Uint16 newvalue);
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76 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet16(Uint16 * ptr);
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77 extern DECLSPEC void SDLCALL SDL_AtomicClear16(Uint16 * ptr);
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78 extern DECLSPEC Uint16 SDLCALL SDL_AtomicFetchThenIncrement16(Uint16 * ptr);
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79 extern DECLSPEC Uint16 SDLCALL SDL_AtomicFetchThenDecrement16(Uint16 * ptr);
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80 extern DECLSPEC Uint16 SDLCALL SDL_AtomicFetchThenAdd16(Uint16 * ptr, Uint16 value);
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81 extern DECLSPEC Uint16 SDLCALL SDL_AtomicFetchThenSubtract16(Uint16 * ptr, Uint16 value);
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82 extern DECLSPEC Uint16 SDLCALL SDL_AtomicIncrementThenFetch16(Uint16 * ptr);
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83 extern DECLSPEC Uint16 SDLCALL SDL_AtomicDecrementThenFetch16(Uint16 * ptr);
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84 extern DECLSPEC Uint16 SDLCALL SDL_AtomicAddThenFetch16(Uint16 * ptr, Uint16 value);
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85 extern DECLSPEC Uint16 SDLCALL SDL_AtomicSubtractThenFetch16(Uint16 * ptr, Uint16 value);
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86
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87 /* 32 bit atomic operations */
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88
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89 /**
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90 * \fn int SDL_AtomicExchange32(Uint32 * ptr, Uint32 value)
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91 *
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92 * \brief Atomically exchange two 32 bit values.
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93 *
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94 * \return the value point to by ptr.
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95 *
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96 * \param ptr points to the value to be fetched from *ptr.
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97 * \param value is value to be stored at *ptr.
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98 *
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99 * The current value stored at *ptr is returned and it is replaced
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100 * with value. This function can be used to implement SDL_TestThenSet.
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101 *
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102 */
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103 extern DECLSPEC Uint32 SDLCALL SDL_AtomicExchange32(Uint32 * ptr, Uint32 value);
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104 /**
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105 * \fn int SDL_AtomicCompareThenSet32(Uint32 * ptr, Uint32 oldvalue, Uint32 newvalue)
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106 *
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107 * \brief If *ptr == oldvalue then replace the contents of *ptr by new value.
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108 *
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109 * \return true if the newvalue was stored.
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110 *
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111 * \param *ptr is the value to be compared and replaced.
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112 * \param oldvalue is value to be compared to *ptr.
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113 * \param newvalue is value to be stored at *ptr.
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114 *
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115 */
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116 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet32(Uint32 * ptr,
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117 Uint32 oldvalue, Uint32 newvalue);
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118 /**
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119 * \fn SDL_bool SDL_AtomicTestThenSet32(Uint32 * ptr);
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120 *
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121 * \brief Check to see if *ptr == 0 and set it to non-zero.
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122 *
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123 * \return SDL_True if the value pointed to by ptr was zero and
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124 * SDL_False if it was not zero
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125 *
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126 * \param ptr points to the value to be tested and set.
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127 *
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128 */
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129 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet32(Uint32 * ptr);
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130 /**
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131 * \fn void SDL_AtomicClear32(Uint32 * ptr);
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132 *
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133 * \brief set the value pointed to by ptr to be zero.
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134 *
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135 * \param ptr address of the value to be set to zero
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136 *
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137 */
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138 extern DECLSPEC void SDLCALL SDL_AtomicClear32(Uint32 * ptr);
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139 /**
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140 * \fn Uint32 SDL_AtomicFetchThenIncrement32(Uint32 * ptr);
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141 *
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142 * \brief fetch the current value of *ptr and then increment that
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143 * value in place.
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144 *
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145 * \return the value before it was incremented.
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146 *
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147 * \param ptr address of the value to fetch and increment
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148 *
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149 */
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150 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenIncrement32(Uint32 * ptr);
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151 /**
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152 * \fn Uint32 SDL_AtomicFetchThenDecrement32(Uint32 * ptr);
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153 *
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154 * \brief fetch *ptr and then decrement the value in place.
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155 *
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156 * \return the value before it was decremented.
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157 *
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158 * \param ptr address of the value to fetch and drement
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159 *
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160 */
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161 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenDecrement32(Uint32 * ptr);
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162 /**
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163 * \fn Uint32 SDL_AtomicFetchThenAdd32(Uint32 * ptr, Uint32 value);
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164 *
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165 * \brief fetch the current value at ptr and then add value to *ptr.
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166 *
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167 * \return *ptr before the addition took place.
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168 *
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169 * \param ptr the address of data we are changing.
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170 * \param value the value to add to *ptr.
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171 *
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172 */
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173 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenAdd32(Uint32 * ptr, Uint32 value);
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174 /**
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175 * \fn Uint32 SDL_AtomicFetchThenSubtract32(Uint32 * ptr, Uint32 value);
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176 *
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177 * \brief Fetch *ptr and then subtract value from it.
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178 *
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179 * \return *ptr before the subtraction took place.
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180 *
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181 * \param ptr the address of the data being changed.
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182 * \param value the value to subtract from *ptr.
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183 *
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184 */
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185 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenSubtract32(Uint32 * ptr, Uint32 value);
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186 /**
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187 * \fn Uint32 SDL_AtomicIncrementThenFetch32(Uint32 * ptr);
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188 *
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189 * \brief Add one to the data pointed to by ptr and return that value.
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190 *
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191 * \return the incremented value.
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192 *
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193 * \param ptr address of the data to increment.
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194 *
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195 */
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196 extern DECLSPEC Uint32 SDLCALL SDL_AtomicIncrementThenFetch32(Uint32 * ptr);
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197 /**
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198 * \fn Uint32 SDL_AtomicDecrementThenFetch32(Uint32 * ptr);
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199 *
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200 * \brief Subtract one from data pointed to by ptr and return the new value.
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201 *
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202 * \return The decremented value.
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203 *
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204 * \param ptr The address of the data to decrement.
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205 *
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206 */
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207 extern DECLSPEC Uint32 SDLCALL SDL_AtomicDecrementThenFetch32(Uint32 * ptr);
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208 /**
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209 * \fn Uint32 SDL_AtomicAddThenFetch32(Uint32 * ptr, Uint32 value);
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210 *
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211 * \brief Add value to the data pointed to by ptr and return result.
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212 *
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213 * \return The sum of *ptr and value.
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214 *
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215 * \param ptr The address of the data to be modified.
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216 * \param value The value to be added.
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217 *
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218 */
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219 extern DECLSPEC Uint32 SDLCALL SDL_AtomicAddThenFetch32(Uint32 * ptr, Uint32 value);
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220 /**
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221 * \fn Uint32 SDL_AtomicSubtractThenFetch32(Uint32 * ptr, Uint32 value);
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222 *
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223 * \brief Subtract value from the data pointed to by ptr and return the result.
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224 *
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225 * \return the difference between *ptr and value.
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226 *
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227 * \param ptr The address of the data to be modified.
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228 * \param value The value to be subtracted.
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229 *
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230 */
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231 extern DECLSPEC Uint32 SDLCALL SDL_AtomicSubtractThenFetch32(Uint32 * ptr, Uint32 value);
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232
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233 /* 64 bit atomic operations */
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234 #ifdef SDL_HAS_64BIT_TYPE
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235
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236 extern DECLSPEC Uint64 SDLCALL SDL_AtomicExchange64(Uint64 * ptr, Uint64 value);
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237 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet64(Uint64 * ptr,
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238 Uint64 oldvalue, Uint64 newvalue);
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239 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet64(Uint64 * ptr);
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240 extern DECLSPEC void SDLCALL SDL_AtomicClear64(Uint64 * ptr);
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241 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenIncrement64(Uint64 * ptr);
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242 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenDecrement64(Uint64 * ptr);
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243 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenAdd64(Uint64 * ptr, Uint64 value);
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244 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenSubtract64(Uint64 * ptr, Uint64 value);
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245 extern DECLSPEC Uint64 SDLCALL SDL_AtomicIncrementThenFetch64(Uint64 * ptr);
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246 extern DECLSPEC Uint64 SDLCALL SDL_AtomicDecrementThenFetch64(Uint64 * ptr);
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
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247 extern DECLSPEC Uint64 SDLCALL SDL_AtomicAddThenFetch64(Uint64 * ptr, Uint64 value);
3e1bf2b8bd81 This check in updates SDL_atomic.h to reflect the new set of atomic operations in 32 and 64 bit form.
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248 extern DECLSPEC Uint64 SDLCALL SDL_AtomicSubtractThenFetch64(Uint64 * ptr, Uint64 value);
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3aa519a5c676 I've made so many changes I don't dare continue until I check the current stuff in.
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249 #endif /* SDL_HAS_64BIT_TYPE */
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250
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251 /* Ends C function definitions when using C++ */
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252 #ifdef __cplusplus
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253 /* *INDENT-OFF* */
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254 }
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255 /* *INDENT-ON* */
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256 #endif
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257
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258 #include "close_code.h"
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259
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260 #endif /* _SDL_atomic_h_ */
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261
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262 /* vi: set ts=4 sw=4 expandtab: */