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annotate include/SDL_atomic.h @ 3235:d35b649858e0

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David Carre to Sam Hello sam, me again. I'v fixed another bug in the pandora code, it's on the no-X videodriver, i forgot to add some code to destroy the window so it was impossible to reload SDL inside the same application (eglTerminate). You'll find the svn diff attached. See you, David.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 11 Aug 2009 13:45:01 +0000
parents 48a80f2a7ff2
children 916f396fe65d
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(volatile Uint8 * ptr, Uint8 value);
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58 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet8(volatile Uint8 * ptr,
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59 Uint8 oldvalue, Uint8 newvalue);
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60 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet8(volatile Uint8 * ptr);
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61 extern DECLSPEC void SDLCALL SDL_AtomicClear8(volatile Uint8 * ptr);
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62 extern DECLSPEC Uint8 SDLCALL SDL_AtomicFetchThenIncrement8(volatile Uint8 * ptr);
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63 extern DECLSPEC Uint8 SDLCALL SDL_AtomicFetchThenDecrement8(volatile Uint8 * ptr);
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64 extern DECLSPEC Uint8 SDLCALL SDL_AtomicFetchThenAdd8(volatile Uint8 * ptr, Uint8 value);
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65 extern DECLSPEC Uint8 SDLCALL SDL_AtomicFetchThenSubtract8(volatile Uint8 * ptr, Uint8 value);
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66 extern DECLSPEC Uint8 SDLCALL SDL_AtomicIncrementThenFetch8(volatile Uint8 * ptr);
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67 extern DECLSPEC Uint8 SDLCALL SDL_AtomicDecrementThenFetch8(volatile Uint8 * ptr);
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68 extern DECLSPEC Uint8 SDLCALL SDL_AtomicAddThenFetch8(volatile Uint8 * ptr, Uint8 value);
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69 extern DECLSPEC Uint8 SDLCALL SDL_AtomicSubtractThenFetch8(volatile 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(volatile Uint16 * ptr, Uint16 value);
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74 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet16(volatile Uint16 * ptr,
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75 Uint16 oldvalue, Uint16 newvalue);
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76 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet16(volatile Uint16 * ptr);
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77 extern DECLSPEC void SDLCALL SDL_AtomicClear16(volatile Uint16 * ptr);
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78 extern DECLSPEC Uint16 SDLCALL SDL_AtomicFetchThenIncrement16(volatile Uint16 * ptr);
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79 extern DECLSPEC Uint16 SDLCALL SDL_AtomicFetchThenDecrement16(volatile Uint16 * ptr);
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80 extern DECLSPEC Uint16 SDLCALL SDL_AtomicFetchThenAdd16(volatile Uint16 * ptr, Uint16 value);
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81 extern DECLSPEC Uint16 SDLCALL SDL_AtomicFetchThenSubtract16(volatile Uint16 * ptr, Uint16 value);
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82 extern DECLSPEC Uint16 SDLCALL SDL_AtomicIncrementThenFetch16(volatile Uint16 * ptr);
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83 extern DECLSPEC Uint16 SDLCALL SDL_AtomicDecrementThenFetch16(volatile Uint16 * ptr);
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84 extern DECLSPEC Uint16 SDLCALL SDL_AtomicAddThenFetch16(volatile Uint16 * ptr, Uint16 value);
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85 extern DECLSPEC Uint16 SDLCALL SDL_AtomicSubtractThenFetch16(volatile 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(volatile 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(volatile Uint32 * ptr, Uint32 value);
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104 /**
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105 * \fn int SDL_AtomicCompareThenSet32(volatile 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(volatile 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(volatile 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(volatile Uint32 * ptr);
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130 /**
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131 * \fn void SDL_AtomicClear32(volatile 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(volatile Uint32 * ptr);
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139 /**
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140 * \fn Uint32 SDL_AtomicFetchThenIncrement32(volatile 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(volatile Uint32 * ptr);
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151 /**
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152 * \fn Uint32 SDL_AtomicFetchThenDecrement32(volatile 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(volatile Uint32 * ptr);
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162 /**
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163 * \fn Uint32 SDL_AtomicFetchThenAdd32(volatile 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(volatile Uint32 * ptr, Uint32 value);
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174 /**
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175 * \fn Uint32 SDL_AtomicFetchThenSubtract32(volatile 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(volatile Uint32 * ptr, Uint32 value);
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186 /**
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187 * \fn Uint32 SDL_AtomicIncrementThenFetch32(volatile 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(volatile Uint32 * ptr);
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197 /**
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198 * \fn Uint32 SDL_AtomicDecrementThenFetch32(volatile 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(volatile Uint32 * ptr);
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208 /**
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209 * \fn Uint32 SDL_AtomicAddThenFetch32(volatile 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(volatile Uint32 * ptr, Uint32 value);
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220 /**
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221 * \fn Uint32 SDL_AtomicSubtractThenFetch32(volatile 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(volatile 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(volatile Uint64 * ptr, Uint64 value);
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237 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCompareThenSet64(volatile Uint64 * ptr,
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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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238 Uint64 oldvalue, Uint64 newvalue);
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48a80f2a7ff2 volitile... duh, yeah the variable need to be labeled volitile
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239 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet64(volatile Uint64 * ptr);
48a80f2a7ff2 volitile... duh, yeah the variable need to be labeled volitile
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240 extern DECLSPEC void SDLCALL SDL_AtomicClear64(volatile Uint64 * ptr);
48a80f2a7ff2 volitile... duh, yeah the variable need to be labeled volitile
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241 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenIncrement64(volatile Uint64 * ptr);
48a80f2a7ff2 volitile... duh, yeah the variable need to be labeled volitile
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242 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenDecrement64(volatile Uint64 * ptr);
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243 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenAdd64(volatile Uint64 * ptr, Uint64 value);
48a80f2a7ff2 volitile... duh, yeah the variable need to be labeled volitile
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244 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenSubtract64(volatile Uint64 * ptr, Uint64 value);
48a80f2a7ff2 volitile... duh, yeah the variable need to be labeled volitile
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245 extern DECLSPEC Uint64 SDLCALL SDL_AtomicIncrementThenFetch64(volatile Uint64 * ptr);
48a80f2a7ff2 volitile... duh, yeah the variable need to be labeled volitile
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246 extern DECLSPEC Uint64 SDLCALL SDL_AtomicDecrementThenFetch64(volatile Uint64 * ptr);
48a80f2a7ff2 volitile... duh, yeah the variable need to be labeled volitile
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247 extern DECLSPEC Uint64 SDLCALL SDL_AtomicAddThenFetch64(volatile Uint64 * ptr, Uint64 value);
48a80f2a7ff2 volitile... duh, yeah the variable need to be labeled volitile
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248 extern DECLSPEC Uint64 SDLCALL SDL_AtomicSubtractThenFetch64(volatile Uint64 * ptr, Uint64 value);
3202
3aa519a5c676 I've made so many changes I don't dare continue until I check the current stuff in.
Bob Pendleton <bob@pendleton.com>
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249 #endif /* SDL_HAS_64BIT_TYPE */
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77d6336711fc First commit for SDL atomic operations.
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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: */