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annotate include/SDL_atomic.h @ 5038:40ef2ad3757c

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author Sam Lantinga <slouken@libsdl.org>
date Wed, 19 Jan 2011 13:44:55 -0800
parents 38638d228a22
children 1e94e68525d5
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(_MSC_VER)
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116 #include <intrin.h>
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117
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118 #define SDL_AtomicSet(a, v) _InterlockedExchange((long*)&(a)->value, (v))
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119 #define SDL_AtomicGet(a) ((a)->value)
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120 #define SDL_AtomicAdd(a, v) _InterlockedExchangeAdd((long*)&(a)->value, (v))
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121 #define SDL_AtomicCAS(a, oldval, newval) (_InterlockedCompareExchange((long*)&(a)->value, (newval), (oldval)) == (oldval))
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122 #define SDL_AtomicSetPtr(a, v) (void)_InterlockedExchangePointer((a), (v))
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123 #define SDL_AtomicGetPtr(a) (*(a))
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124 #if _M_IX86
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125 #define SDL_AtomicCASPtr(a, oldval, newval) (_InterlockedCompareExchange((long*)(a), (long)(newval), (long)(oldval)) == (long)(oldval))
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126 #else
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127 #define SDL_AtomicCASPtr(a, oldval, newval) (_InterlockedCompareExchangePointer((a), (newval), (oldval)) == (oldval))
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128 #endif
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129
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130 #elif defined(__MACOSX__)
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131 #include <libkern/OSAtomic.h>
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132
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133 #define SDL_AtomicSet(a, v) \
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134 ({ \
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135 int oldvalue; \
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136 \
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137 do { \
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138 oldvalue = (a)->value; \
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139 } while (!OSAtomicCompareAndSwap32Barrier(oldvalue, v, &(a)->value)); \
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140 \
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141 oldvalue; \
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142 })
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143 #define SDL_AtomicGet(a) ((a)->value)
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144 #define SDL_AtomicAdd(a, v) \
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145 ({ \
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146 int oldvalue; \
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147 \
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148 do { \
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149 oldvalue = (a)->value; \
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150 } while (!OSAtomicCompareAndSwap32Barrier(oldvalue, oldvalue+v, &(a)->value)); \
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151 \
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152 oldvalue; \
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153 })
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154 #define SDL_AtomicCAS(a, oldval, newval) OSAtomicCompareAndSwap32Barrier(oldval, newval, &(a)->value)
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155 #define SDL_AtomicSetPtr(a, v) (*(a) = v, OSMemoryBarrier())
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156 #define SDL_AtomicGetPtr(a) (*(a))
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157 #if SIZEOF_VOIDP == 4
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158 #define SDL_AtomicCASPtr(a, oldval, newval) OSAtomicCompareAndSwap32Barrier((int32_t)(oldval), (int32_t)(newval), (int32_t*)(a))
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159 #elif SIZEOF_VOIDP == 8
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160 #define SDL_AtomicCASPtr(a, oldval, newval) OSAtomicCompareAndSwap64Barrier((int64_t)(oldval), (int64_t)(newval), (int64_t*)(a))
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161 #endif
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162
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163 #elif defined(HAVE_GCC_ATOMICS)
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164
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165 #define SDL_AtomicSet(a, v) __sync_lock_test_and_set(&(a)->value, v)
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166 #define SDL_AtomicGet(a) ((a)->value)
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167 #define SDL_AtomicAdd(a, v) __sync_fetch_and_add(&(a)->value, v)
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168 #define SDL_AtomicCAS(a, oldval, newval) __sync_bool_compare_and_swap(&(a)->value, oldval, newval)
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169 #define SDL_AtomicSetPtr(a, v) (*(a) = v, __sync_synchronize())
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170 #define SDL_AtomicGetPtr(a) (*(a))
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171 #define SDL_AtomicCASPtr(a, oldval, newval) __sync_bool_compare_and_swap(a, oldval, newval)
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172
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173 #endif
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174
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175 #endif /* !SDL_DISABLE_ATOMIC_INLINE */
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176
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177
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178 /**
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179 * \brief A type representing an atomic integer value. It is a struct
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180 * so people don't accidentally use numeric operations on it.
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181 */
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182 #ifndef SDL_atomic_t_defined
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183 typedef struct { int value; } SDL_atomic_t;
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184 #endif
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185
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186 /**
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187 * \brief Set an atomic variable to a value.
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188 *
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189 * \return The previous value of the atomic variable.
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190 */
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191 #ifndef SDL_AtomicSet
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192 extern DECLSPEC int SDLCALL SDL_AtomicSet(SDL_atomic_t *a, int value);
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193 #endif
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194
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195 /**
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196 * \brief Get the value of an atomic variable
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197 */
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198 #ifndef SDL_AtomicGet
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199 extern DECLSPEC int SDLCALL SDL_AtomicGet(SDL_atomic_t *a);
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200 #endif
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201
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202 /**
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203 * \brief Add to an atomic variable.
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204 *
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205 * \return The previous value of the atomic variable.
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206 */
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207 #ifndef SDL_AtomicAdd
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208 extern DECLSPEC int SDLCALL SDL_AtomicAdd(SDL_atomic_t *a, int value);
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209 #endif
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210
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211 /**
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212 * \brief Increment an atomic variable used as a reference count.
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213 */
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214 #ifndef SDL_AtomicIncRef
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215 extern DECLSPEC void SDLCALL SDL_AtomicIncRef(SDL_atomic_t *a);
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216 #endif
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217
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218 /**
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219 * \brief Decrement an atomic variable used as a reference count.
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220 *
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221 * \return SDL_TRUE if the variable has reached zero after decrementing,
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222 * SDL_FALSE otherwise
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223 */
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224 #ifndef SDL_AtomicDecRef
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225 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicDecRef(SDL_atomic_t *a);
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226 #endif
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227
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228 /**
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229 * \brief Set an atomic variable to a new value if it is currently an old value.
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230 *
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231 * \return SDL_TRUE if the atomic variable was set, SDL_FALSE otherwise.
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232 *
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233 * \note If you don't know what this function is for, you shouldn't use it!
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234 */
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235 #ifndef SDL_AtomicCAS
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236 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCAS(SDL_atomic_t *a, int oldval, int newval);
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237 #endif
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238
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239 /**
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240 * \brief Set a pointer to a value atomically.
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241 */
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242 #ifndef SDL_AtomicSetPtr
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243 extern DECLSPEC void SDLCALL SDL_AtomicSetPtr(void** a, void* value);
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244 #endif
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245
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246 /**
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247 * \brief Get the value of a pointer atomically.
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248 */
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249 #ifndef SDL_AtomicGetPtr
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250 extern DECLSPEC void* SDLCALL SDL_AtomicGetPtr(void** a);
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251 #endif
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252
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253 /**
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254 * \brief Set a pointer to a new value if it is currently an old value.
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255 *
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256 * \return SDL_TRUE if the pointer was set, SDL_FALSE otherwise.
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257 *
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258 * \note If you don't know what this function is for, you shouldn't use it!
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259 */
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260 #ifndef SDL_AtomicCASPtr
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261 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCASPtr(void **a, void *oldval, void *newval);
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262 #endif
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263
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264 /* Ends C function definitions when using C++ */
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265 #ifdef __cplusplus
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266 /* *INDENT-OFF* */
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267 }
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268 /* *INDENT-ON* */
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269 #endif
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270
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271 #include "close_code.h"
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272
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273 #endif /* _SDL_atomic_h_ */
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274
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275 /* vi: set ts=4 sw=4 expandtab: */