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annotate include/SDL_atomic.h @ 5011:d306007299ac

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Use the portable intrinsic
author Sam Lantinga <slouken@libsdl.org>
date Mon, 17 Jan 2011 13:52:40 -0800
parents 8e8876e4aec6
children 2e282002bac3
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 * IMPORTANT:
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29 * If you are not an expert in concurrent lockless programming, you should
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30 * only be using the atomic lock and reference counting functions in this
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31 * file. In all other cases you should be protecting your data structures
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32 * with full mutexes.
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33 *
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34 * The list of "safe" functions to use are:
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35 * SDL_AtomicLock()
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36 * SDL_AtomicUnlock()
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37 * SDL_AtomicIncRef()
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38 * SDL_AtomicDecRef()
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39 *
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40 * Seriously, here be dragons!
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41 *
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42 * These operations may, or may not, actually be implemented using
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43 * processor specific atomic operations. When possible they are
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44 * implemented as true processor specific atomic operations. When that
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45 * is not possible the are implemented using locks that *do* use the
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46 * available atomic operations.
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47 *
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48 * All of the atomic operations that modify memory are full memory barriers.
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49 */
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50
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51 #ifndef _SDL_atomic_h_
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52 #define _SDL_atomic_h_
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53
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54 #include "SDL_stdinc.h"
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55 #include "SDL_platform.h"
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56
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57 #include "begin_code.h"
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58
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59 /* Set up for C function definitions, even when using C++ */
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60 #ifdef __cplusplus
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61 /* *INDENT-OFF* */
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62 extern "C" {
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63 /* *INDENT-ON* */
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64 #endif
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65
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66 /**
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67 * \name SDL AtomicLock
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68 *
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69 * The atomic locks are efficient spinlocks using CPU instructions,
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70 * but are vulnerable to starvation and can spin forever if a thread
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71 * holding a lock has been terminated. For this reason you should
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72 * minimize the code executed inside an atomic lock and never do
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73 * expensive things like API or system calls while holding them.
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74 *
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75 * The atomic locks are not safe to lock recursively.
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76 *
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77 * Porting Note:
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78 * The spin lock functions and type are required and can not be
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79 * emulated because they are used in the atomic emulation code.
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80 */
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81 /*@{*/
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82
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83 typedef int SDL_SpinLock;
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84
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85 /**
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86 * \brief Try to lock a spin lock by setting it to a non-zero value.
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87 *
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88 * \param lock Points to the lock.
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89 *
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90 * \return SDL_TRUE if the lock succeeded, SDL_FALSE if the lock is already held.
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91 */
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92 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTryLock(SDL_SpinLock *lock);
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93
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94 /**
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95 * \brief Lock a spin lock by setting it to a non-zero value.
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96 *
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97 * \param lock Points to the lock.
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98 */
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99 extern DECLSPEC void SDLCALL SDL_AtomicLock(SDL_SpinLock *lock);
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100
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101 /**
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102 * \brief Unlock a spin lock by setting it to 0. Always returns immediately
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103 *
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104 * \param lock Points to the lock.
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105 */
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106 extern DECLSPEC void SDLCALL SDL_AtomicUnlock(SDL_SpinLock *lock);
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107
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108 /*@}*//*SDL AtomicLock*/
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109
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110 /* Platform specific optimized versions of the atomic functions,
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111 * you can disable these by defining SDL_DISABLE_ATOMIC_INLINE
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112 */
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113 #ifndef SDL_DISABLE_ATOMIC_INLINE
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114
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115 #if defined(__WIN32__)
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116 /* Don't include windows.h, since it may hose code that isn't expecting it,
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117 but if someone has already included it, this is fair game... */
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118 #define WIN32_LEAN_AND_MEAN
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119 #include <windows.h>
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120
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121 #define SDL_AtomicSet(a, v) InterlockedExchange(&(a)->value, v)
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122 #define SDL_AtomicGet(a) ((a)->value)
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123 #define SDL_AtomicAdd(a, v) InterlockedAdd(&(a)->value, v)
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124 #define SDL_AtomicCAS(a, oldval, newval) (InterlockedCompareExchange(&(a)->value, newval, oldval) == (oldval))
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125 #define SDL_AtomicSetPtr(a, v) InterlockedExchangePointer(a, v)
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126 #define SDL_AtomicGetPtr(a) (*(a))
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127 #define SDL_AtomicCASPtr(a, oldval, newval) (InterlockedCompareExchangePointer(a, newval, oldval) == (oldval))
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128
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129 #elif defined(__MACOSX__)
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130 #include <libkern/OSAtomic.h>
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131
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132 #define SDL_AtomicSet(a, v) \
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133 ({ \
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134 int oldvalue; \
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135 \
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136 do { \
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137 oldvalue = (a)->value; \
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138 } while (!OSAtomicCompareAndSwap32Barrier(oldvalue, v, &(a)->value)); \
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139 \
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140 oldvalue; \
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141 })
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142 #define SDL_AtomicGet(a) ((a)->value)
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143 #define SDL_AtomicAdd(a, v) \
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144 ({ \
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145 int oldvalue; \
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146 \
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147 do { \
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148 oldvalue = (a)->value; \
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149 } while (!OSAtomicCompareAndSwap32Barrier(oldvalue, oldvalue+v, &(a)->value)); \
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150 \
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151 oldvalue; \
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152 })
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153 #define SDL_AtomicCAS(a, oldval, newval) OSAtomicCompareAndSwap32Barrier(oldval, newval, &(a)->value)
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154 #define SDL_AtomicSetPtr(a, v) (*(a) = v, OSMemoryBarrier())
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155 #define SDL_AtomicGetPtr(a) (*(a))
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156 #if SIZEOF_VOIDP == 4
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157 #define SDL_AtomicCASPtr(a, oldval, newval) OSAtomicCompareAndSwap32Barrier((int32_t)(oldval), (int32_t)(newval), (int32_t*)(a))
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158 #elif SIZEOF_VOIDP == 8
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159 #define SDL_AtomicCASPtr(a, oldval, newval) OSAtomicCompareAndSwap64Barrier((int64_t)(oldval), (int64_t)(newval), (int64_t*)(a))
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160 #endif
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161
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162 #elif defined(HAVE_GCC_ATOMICS)
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163
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164 #define SDL_AtomicSet(a, v) __sync_lock_test_and_set(&(a)->value, v)
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165 #define SDL_AtomicGet(a) ((a)->value)
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166 #define SDL_AtomicAdd(a, v) __sync_fetch_and_add(&(a)->value, v)
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167 #define SDL_AtomicCAS(a, oldval, newval) __sync_bool_compare_and_swap(&(a)->value, oldval, newval)
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168 #define SDL_AtomicSetPtr(a, v) (*(a) = v, __sync_synchronize())
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169 #define SDL_AtomicGetPtr(a) (*(a))
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170 #define SDL_AtomicCASPtr(a, oldval, newval) __sync_bool_compare_and_swap(a, oldval, newval)
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171
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172 #endif
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173
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174 #endif /* !SDL_DISABLE_ATOMIC_INLINE */
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175
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176
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177 /**
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178 * \brief A type representing an atomic integer value. It is a struct
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179 * so people don't accidentally use numeric operations on it.
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180 */
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181 #ifndef SDL_atomic_t_defined
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182 typedef struct { int value; } SDL_atomic_t;
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183 #endif
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184
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185 /**
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186 * \brief Set an atomic variable to a value.
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187 *
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188 * \return The previous value of the atomic variable.
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189 */
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190 #ifndef SDL_AtomicSet
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191 extern DECLSPEC int SDLCALL SDL_AtomicSet(SDL_atomic_t *a, int value);
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192 #endif
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193
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194 /**
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195 * \brief Get the value of an atomic variable
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196 */
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197 #ifndef SDL_AtomicGet
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198 extern DECLSPEC int SDLCALL SDL_AtomicGet(SDL_atomic_t *a);
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199 #endif
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200
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201 /**
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202 * \brief Add to an atomic variable.
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203 *
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204 * \return The previous value of the atomic variable.
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205 */
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206 #ifndef SDL_AtomicAdd
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207 extern DECLSPEC int SDLCALL SDL_AtomicAdd(SDL_atomic_t *a, int value);
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208 #endif
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209
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210 /**
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211 * \brief Increment an atomic variable used as a reference count.
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212 */
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213 #ifndef SDL_AtomicIncRef
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214 extern DECLSPEC void SDLCALL SDL_AtomicIncRef(SDL_atomic_t *a);
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215 #endif
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216
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217 /**
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218 * \brief Decrement an atomic variable used as a reference count.
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219 *
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220 * \return SDL_TRUE if the variable has reached zero after decrementing,
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221 * SDL_FALSE otherwise
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222 */
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223 #ifndef SDL_AtomicDecRef
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224 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicDecRef(SDL_atomic_t *a);
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225 #endif
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226
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227 /**
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228 * \brief Set an atomic variable to a new value if it is currently an old value.
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229 *
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230 * \return SDL_TRUE if the atomic variable was set, SDL_FALSE otherwise.
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231 *
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232 * \note If you don't know what this function is for, you shouldn't use it!
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233 */
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234 #ifndef SDL_AtomicCAS
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235 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCAS(SDL_atomic_t *a, int oldval, int newval);
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236 #endif
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237
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238 /**
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239 * \brief Set a pointer to a value atomically.
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240 */
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241 #ifndef SDL_AtomicSetPtr
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242 extern DECLSPEC void SDLCALL SDL_AtomicSetPtr(void** a, void* value);
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243 #endif
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244
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245 /**
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246 * \brief Get the value of a pointer atomically.
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247 */
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248 #ifndef SDL_AtomicGetPtr
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249 extern DECLSPEC void* SDLCALL SDL_AtomicGetPtr(void** a);
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250 #endif
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251
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252 /**
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253 * \brief Set a pointer to a new value if it is currently an old value.
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254 *
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255 * \return SDL_TRUE if the pointer was set, SDL_FALSE otherwise.
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256 *
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257 * \note If you don't know what this function is for, you shouldn't use it!
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258 */
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259 #ifndef SDL_AtomicCASPtr
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260 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCASPtr(void **a, void *oldval, void *newval);
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261 #endif
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262
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263 /* Ends C function definitions when using C++ */
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264 #ifdef __cplusplus
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265 /* *INDENT-OFF* */
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266 }
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267 /* *INDENT-ON* */
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268 #endif
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269
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270 #include "close_code.h"
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271
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272 #endif /* _SDL_atomic_h_ */
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273
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274 /* vi: set ts=4 sw=4 expandtab: */