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annotate include/SDL_atomic.h @ 3385:45d7f0f70b27

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Joystick patch from FreeBSD ports system
author Sam Lantinga <slouken@libsdl.org>
date Mon, 12 Oct 2009 09:42:50 +0000
parents 72b542f34739
children d3baf5ac4e37
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 Contributed by Bob Pendleton, bob@pendleton.com
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23 */
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24
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25 /**
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26 * \file SDL_atomic.h
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27 *
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28 * Atomic operations.
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29 */
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30
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31 #ifndef _SDL_atomic_h_
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32 #define _SDL_atomic_h_
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33
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34 #include "SDL_stdinc.h"
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35 #include "SDL_platform.h"
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36
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37 #include "begin_code.h"
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38
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39 /* Set up for C function definitions, even when using C++ */
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40 #ifdef __cplusplus
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41 /* *INDENT-OFF* */
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42 extern "C" {
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43 /* *INDENT-ON* */
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44 #endif
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45
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46 /**
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47 * These operations may, or may not, actually be implemented using
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48 * processor specific atomic operations. When possible they are
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49 * implemented as true processor specific atomic operations. When that
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50 * is not possible the are implemented using locks that *do* use the
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51 * available atomic operations.
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52 *
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53 * At the very minimum spin locks must be implemented. Without spin
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54 * locks it is not possible (AFAICT) to emulate the rest of the atomic
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55 * operations.
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56 */
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57
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58 /* Function prototypes */
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59
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60 /**
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61 * SDL AtomicLock.
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62 *
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63 * The spin lock functions and type are required and can not be
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64 * emulated because they are used in the emulation code.
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65 */
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66
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67 typedef volatile Uint32 SDL_SpinLock;
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68
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69 /**
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70 * \fn void SDL_AtomicLock(SDL_SpinLock *lock);
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71 *
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72 * \brief Lock a spin lock by setting it to a none zero value.
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73 *
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74 * \param lock points to the lock.
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75 *
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76 */
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77 extern DECLSPEC void SDLCALL SDL_AtomicLock(SDL_SpinLock *lock);
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78
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79 /**
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80 * \fn void SDL_AtomicUnlock(SDL_SpinLock *lock);
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81 *
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82 * \brief Unlock a spin lock by setting it to 0. Always returns immediately
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83 *
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84 * \param lock points to the lock.
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85 *
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86 */
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87 extern DECLSPEC void SDLCALL SDL_AtomicUnlock(SDL_SpinLock *lock);
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88
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89 /* 32 bit atomic operations */
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90
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91 /**
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92 * \fn SDL_bool SDL_AtomicTestThenSet32(volatile Uint32 * ptr);
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93 *
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94 * \brief Check to see if *ptr == 0 and set it to 1.
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95 *
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96 * \return SDL_True if the value pointed to by ptr was zero and
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97 * SDL_False if it was not zero
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98 *
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99 * \param ptr points to the value to be tested and set.
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100 *
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101 */
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102 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet32(volatile Uint32 * ptr);
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103
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104 /**
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105 * \fn void SDL_AtomicClear32(volatile Uint32 * ptr);
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106 *
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107 * \brief set the value pointed to by ptr to be zero.
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108 *
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109 * \param ptr address of the value to be set to zero
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110 *
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111 */
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112 extern DECLSPEC void SDLCALL SDL_AtomicClear32(volatile Uint32 * ptr);
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113
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114 /**
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115 * \fn Uint32 SDL_AtomicFetchThenIncrement32(volatile Uint32 * ptr);
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116 *
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117 * \brief fetch the current value of *ptr and then increment that
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118 * value in place.
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119 *
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120 * \return the value before it was incremented.
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121 *
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122 * \param ptr address of the value to fetch and increment
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123 *
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124 */
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125 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenIncrement32(volatile Uint32 * ptr);
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126
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127 /**
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128 * \fn Uint32 SDL_AtomicFetchThenDecrement32(volatile Uint32 * ptr);
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129 *
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130 * \brief fetch *ptr and then decrement the value in place.
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131 *
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132 * \return the value before it was decremented.
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133 *
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134 * \param ptr address of the value to fetch and drement
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135 *
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136 */
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137 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenDecrement32(volatile Uint32 * ptr);
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138
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139 /**
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140 * \fn Uint32 SDL_AtomicFetchThenAdd32(volatile Uint32 * ptr, Uint32 value);
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141 *
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142 * \brief fetch the current value at ptr and then add value to *ptr.
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143 *
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144 * \return *ptr before the addition took place.
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145 *
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146 * \param ptr the address of data we are changing.
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147 * \param value the value to add to *ptr.
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148 *
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149 */
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150 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenAdd32(volatile Uint32 * ptr, Uint32 value);
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151
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152 /**
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153 * \fn Uint32 SDL_AtomicFetchThenSubtract32(volatile Uint32 * ptr, Uint32 value);
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154 *
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155 * \brief Fetch *ptr and then subtract value from it.
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156 *
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157 * \return *ptr before the subtraction took place.
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158 *
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159 * \param ptr the address of the data being changed.
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160 * \param value the value to subtract from *ptr.
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161 *
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162 */
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163 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenSubtract32(volatile Uint32 * ptr, Uint32 value);
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164
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165 /**
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166 * \fn Uint32 SDL_AtomicIncrementThenFetch32(volatile Uint32 * ptr);
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167 *
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168 * \brief Add one to the data pointed to by ptr and return that value.
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169 *
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170 * \return the incremented value.
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171 *
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172 * \param ptr address of the data to increment.
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173 *
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174 */
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175 extern DECLSPEC Uint32 SDLCALL SDL_AtomicIncrementThenFetch32(volatile Uint32 * ptr);
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176
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177 /**
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178 * \fn Uint32 SDL_AtomicDecrementThenFetch32(volatile Uint32 * ptr);
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179 *
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180 * \brief Subtract one from data pointed to by ptr and return the new value.
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181 *
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182 * \return The decremented value.
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183 *
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184 * \param ptr The address of the data to decrement.
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185 *
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186 */
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187 extern DECLSPEC Uint32 SDLCALL SDL_AtomicDecrementThenFetch32(volatile Uint32 * ptr);
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188
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189 /**
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190 * \fn Uint32 SDL_AtomicAddThenFetch32(volatile Uint32 * ptr, Uint32 value);
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191 *
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192 * \brief Add value to the data pointed to by ptr and return result.
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193 *
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194 * \return The sum of *ptr and value.
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195 *
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196 * \param ptr The address of the data to be modified.
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197 * \param value The value to be added.
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198 *
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199 */
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200 extern DECLSPEC Uint32 SDLCALL SDL_AtomicAddThenFetch32(volatile Uint32 * ptr, Uint32 value);
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201
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202 /**
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203 * \fn Uint32 SDL_AtomicSubtractThenFetch32(volatile Uint32 * ptr, Uint32 value);
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204 *
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205 * \brief Subtract value from the data pointed to by ptr and return the result.
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206 *
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207 * \return the difference between *ptr and value.
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208 *
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209 * \param ptr The address of the data to be modified.
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210 * \param value The value to be subtracted.
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211 *
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212 */
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213 extern DECLSPEC Uint32 SDLCALL SDL_AtomicSubtractThenFetch32(volatile Uint32 * ptr, Uint32 value);
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214
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215 /* 64 bit atomic operations */
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216 #ifdef SDL_HAS_64BIT_TYPE
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217
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218 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet64(volatile Uint64 * ptr);
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219 extern DECLSPEC void SDLCALL SDL_AtomicClear64(volatile Uint64 * ptr);
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220 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenIncrement64(volatile Uint64 * ptr);
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221 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenDecrement64(volatile Uint64 * ptr);
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222 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenAdd64(volatile Uint64 * ptr, Uint64 value);
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223 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenSubtract64(volatile Uint64 * ptr, Uint64 value);
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224 extern DECLSPEC Uint64 SDLCALL SDL_AtomicIncrementThenFetch64(volatile Uint64 * ptr);
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225 extern DECLSPEC Uint64 SDLCALL SDL_AtomicDecrementThenFetch64(volatile Uint64 * ptr);
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226 extern DECLSPEC Uint64 SDLCALL SDL_AtomicAddThenFetch64(volatile Uint64 * ptr, Uint64 value);
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227 extern DECLSPEC Uint64 SDLCALL SDL_AtomicSubtractThenFetch64(volatile Uint64 * ptr, Uint64 value);
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228 #endif /* SDL_HAS_64BIT_TYPE */
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229
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230 /* Ends C function definitions when using C++ */
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231 #ifdef __cplusplus
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232 /* *INDENT-OFF* */
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233 }
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234 /* *INDENT-ON* */
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235 #endif
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236
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237 #include "close_code.h"
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238
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239 #endif /* _SDL_atomic_h_ */
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240
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241 /* vi: set ts=4 sw=4 expandtab: */