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annotate include/SDL_atomic.h @ 3511:42cfa69e351b

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On multi-display systems it's perfectly reasonable to have focus on a window on another monitor while the application is fullscreen.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 02 Dec 2009 07:38:28 +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: */