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annotate include/SDL_atomic.h @ 3566:07c8339c95c6

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Fixed bug #905 Give the foreign window message proc more control over Windows events. This may need to be adjusted when we add the capability for the app to specify whether it wants SDL to handle input for the window or not.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 15 Dec 2009 09:20:10 +0000
parents d3baf5ac4e37
children f7b03b6838cb
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 * These operations may, or may not, actually be implemented using
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31 * processor specific atomic operations. When possible they are
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32 * implemented as true processor specific atomic operations. When that
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33 * is not possible the are implemented using locks that *do* use the
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34 * available atomic operations.
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35 *
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36 * At the very minimum spin locks must be implemented. Without spin
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37 * locks it is not possible (AFAICT) to emulate the rest of the atomic
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38 * operations.
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39 */
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40
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41 #ifndef _SDL_atomic_h_
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42 #define _SDL_atomic_h_
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43
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44 #include "SDL_stdinc.h"
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45 #include "SDL_platform.h"
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46
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47 #include "begin_code.h"
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48
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49 /* Set up for C function definitions, even when using C++ */
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50 #ifdef __cplusplus
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51 /* *INDENT-OFF* */
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52 extern "C" {
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53 /* *INDENT-ON* */
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54 #endif
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55
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56 /* Function prototypes */
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57
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58 /**
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59 * \name SDL AtomicLock
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60 *
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61 * The spin lock functions and type are required and can not be
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62 * emulated because they are used in the emulation code.
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63 */
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64 /*@{*/
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65
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66 typedef volatile Uint32 SDL_SpinLock;
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67
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68 /**
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69 * \brief Lock a spin lock by setting it to a none zero value.
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70 *
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71 * \param lock Points to the lock.
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72 */
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73 extern DECLSPEC void SDLCALL SDL_AtomicLock(SDL_SpinLock *lock);
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74
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75 /**
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76 * \brief Unlock a spin lock by setting it to 0. Always returns immediately
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77 *
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78 * \param lock Points to the lock.
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79 */
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80 extern DECLSPEC void SDLCALL SDL_AtomicUnlock(SDL_SpinLock *lock);
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81
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82 /*@}*//*SDL AtomicLock*/
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83
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84 /**
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85 * \name 32 bit atomic operations
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86 */
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87 /*@{*/
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88
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89 /**
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90 * \brief Check to see if \c *ptr == 0 and set it to 1.
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91 *
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92 * \return SDL_True if the value pointed to by \c 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 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet32(volatile Uint32 * ptr);
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98
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99 /**
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100 * \brief Set the value pointed to by \c ptr to be zero.
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101 *
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102 * \param ptr Address of the value to be set to zero
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103 */
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104 extern DECLSPEC void SDLCALL SDL_AtomicClear32(volatile Uint32 * ptr);
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106 /**
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107 * \brief Fetch the current value of \c *ptr and then increment that
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108 * value in place.
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109 *
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110 * \return The value before it was incremented.
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111 *
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112 * \param ptr Address of the value to fetch and increment
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113 */
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114 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenIncrement32(volatile Uint32 * ptr);
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115
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116 /**
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117 * \brief Fetch \c *ptr and then decrement the value in place.
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118 *
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119 * \return The value before it was decremented.
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120 *
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121 * \param ptr Address of the value to fetch and drement
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122 */
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123 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenDecrement32(volatile Uint32 * ptr);
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124
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125 /**
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126 * \brief Fetch the current value at \c ptr and then add \c value to \c *ptr.
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127 *
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128 * \return \c *ptr before the addition took place.
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129 *
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130 * \param ptr The address of data we are changing.
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131 * \param value The value to add to \c *ptr.
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132 */
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133 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenAdd32(volatile Uint32 * ptr, Uint32 value);
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134
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135 /**
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136 * \brief Fetch \c *ptr and then subtract \c value from it.
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137 *
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138 * \return \c *ptr before the subtraction took place.
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139 *
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140 * \param ptr The address of the data being changed.
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141 * \param value The value to subtract from \c *ptr.
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142 */
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143 extern DECLSPEC Uint32 SDLCALL SDL_AtomicFetchThenSubtract32(volatile Uint32 * ptr, Uint32 value);
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144
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145 /**
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146 * \brief Add one to the data pointed to by \c ptr and return that value.
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147 *
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148 * \return The incremented value.
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149 *
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150 * \param ptr The address of the data to increment.
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151 */
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152 extern DECLSPEC Uint32 SDLCALL SDL_AtomicIncrementThenFetch32(volatile Uint32 * ptr);
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153
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154 /**
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155 * \brief Subtract one from data pointed to by \c ptr and return the new value.
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156 *
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157 * \return The decremented value.
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158 *
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159 * \param ptr The address of the data to decrement.
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160 */
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161 extern DECLSPEC Uint32 SDLCALL SDL_AtomicDecrementThenFetch32(volatile Uint32 * ptr);
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162
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163 /**
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164 * \brief Add \c value to the data pointed to by \c ptr and return result.
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165 *
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166 * \return The sum of \c *ptr and \c value.
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167 *
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168 * \param ptr The address of the data to be modified.
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169 * \param value The value to be added.
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170 */
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171 extern DECLSPEC Uint32 SDLCALL SDL_AtomicAddThenFetch32(volatile Uint32 * ptr, Uint32 value);
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172
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173 /**
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174 * \brief Subtract \c value from the data pointed to by \c ptr and return the result.
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175 *
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176 * \return The difference between \c *ptr and \c value.
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177 *
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178 * \param ptr The address of the data to be modified.
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179 * \param value The value to be subtracted.
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180 */
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181 extern DECLSPEC Uint32 SDLCALL SDL_AtomicSubtractThenFetch32(volatile Uint32 * ptr, Uint32 value);
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182
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183 /*@}*//*32 bit atomic operations*/
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184
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185 /**
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186 * \name 64 bit atomic operations
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187 */
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188 /*@{*/
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189 #ifdef SDL_HAS_64BIT_TYPE
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190
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191 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTestThenSet64(volatile Uint64 * ptr);
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192 extern DECLSPEC void SDLCALL SDL_AtomicClear64(volatile Uint64 * ptr);
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193 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenIncrement64(volatile Uint64 * ptr);
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194 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenDecrement64(volatile Uint64 * ptr);
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195 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenAdd64(volatile Uint64 * ptr, Uint64 value);
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196 extern DECLSPEC Uint64 SDLCALL SDL_AtomicFetchThenSubtract64(volatile Uint64 * ptr, Uint64 value);
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197 extern DECLSPEC Uint64 SDLCALL SDL_AtomicIncrementThenFetch64(volatile Uint64 * ptr);
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198 extern DECLSPEC Uint64 SDLCALL SDL_AtomicDecrementThenFetch64(volatile Uint64 * ptr);
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199 extern DECLSPEC Uint64 SDLCALL SDL_AtomicAddThenFetch64(volatile Uint64 * ptr, Uint64 value);
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200 extern DECLSPEC Uint64 SDLCALL SDL_AtomicSubtractThenFetch64(volatile Uint64 * ptr, Uint64 value);
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201 #endif /* SDL_HAS_64BIT_TYPE */
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202
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203 /*@}*//*64 bit atomic operations*/
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204
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205 /* Ends C function definitions when using C++ */
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206 #ifdef __cplusplus
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207 /* *INDENT-OFF* */
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208 }
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209 /* *INDENT-ON* */
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210 #endif
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211
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212 #include "close_code.h"
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213
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214 #endif /* _SDL_atomic_h_ */
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215
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216 /* vi: set ts=4 sw=4 expandtab: */