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annotate include/SDL_atomic.h @ 5172:ededa1ccf91c

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Switched the SDL 1.2 compatibility to use the window surface, so it's fast even when there's no hardware acceleration available. This means that the YUV overlay now uses software, but that's okay since fast YUV code should be using the textures now anyway.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 03 Feb 2011 21:13:55 -0800
parents 1a47d41912ff
children 5d01d426f2ea
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 *
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43 * You can find out a little more about lockless programming and the
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44 * subtle issues that can arise here:
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45 * http://msdn.microsoft.com/en-us/library/ee418650%28v=vs.85%29.aspx
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46 *
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47 * There's also lots of good information here:
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48 * http://www.1024cores.net/home/lock-free-algorithms
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49 *
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50 * These operations may or may not actually be implemented using
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51 * processor specific atomic operations. When possible they are
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52 * implemented as true processor specific atomic operations. When that
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53 * is not possible the are implemented using locks that *do* use the
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54 * available atomic operations.
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55 *
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56 * All of the atomic operations that modify memory are full memory barriers.
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57 */
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58
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59 #ifndef _SDL_atomic_h_
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60 #define _SDL_atomic_h_
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61
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62 #include "SDL_stdinc.h"
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63 #include "SDL_platform.h"
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64
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65 #include "begin_code.h"
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66
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67 /* Need to do this here because intrin.h has C++ code in it */
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68 /* Visual Studio 2005 has a bug where intrin.h conflicts with winnt.h */
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69 #if defined(_MSC_VER) && (_MSC_VER >= 1500) && !defined(_WIN32_WCE)
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70 #include <intrin.h>
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71 #define HAVE_MSC_ATOMICS 1
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72 #endif
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73
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74 /* Set up for C function definitions, even when using C++ */
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75 #ifdef __cplusplus
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76 /* *INDENT-OFF* */
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77 extern "C" {
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78 /* *INDENT-ON* */
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79 #endif
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80
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81 /**
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82 * \name SDL AtomicLock
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83 *
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84 * The atomic locks are efficient spinlocks using CPU instructions,
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85 * but are vulnerable to starvation and can spin forever if a thread
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86 * holding a lock has been terminated. For this reason you should
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87 * minimize the code executed inside an atomic lock and never do
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88 * expensive things like API or system calls while holding them.
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89 *
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90 * The atomic locks are not safe to lock recursively.
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91 *
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92 * Porting Note:
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93 * The spin lock functions and type are required and can not be
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94 * emulated because they are used in the atomic emulation code.
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95 */
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96 /*@{*/
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97
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98 typedef int SDL_SpinLock;
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99
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100 /**
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101 * \brief Try to lock a spin lock by setting it to a non-zero value.
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102 *
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103 * \param lock Points to the lock.
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104 *
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105 * \return SDL_TRUE if the lock succeeded, SDL_FALSE if the lock is already held.
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106 */
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107 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTryLock(SDL_SpinLock *lock);
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108
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109 /**
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110 * \brief Lock a spin lock by setting it to a non-zero value.
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111 *
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112 * \param lock Points to the lock.
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113 */
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114 extern DECLSPEC void SDLCALL SDL_AtomicLock(SDL_SpinLock *lock);
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115
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116 /**
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117 * \brief Unlock a spin lock by setting it to 0. Always returns immediately
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118 *
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119 * \param lock Points to the lock.
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120 */
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121 extern DECLSPEC void SDLCALL SDL_AtomicUnlock(SDL_SpinLock *lock);
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122
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123 /*@}*//*SDL AtomicLock*/
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124
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125
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126 /**
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127 * The compiler barrier prevents the compiler from reordering
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128 * reads and writes to globally visible variables across the call.
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129 */
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130 #ifdef _MSC_VER
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131 void _ReadWriteBarrier(void);
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132 #pragma intrinsic(_ReadWriteBarrier)
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133 #define SDL_CompilerBarrier() _ReadWriteBarrier()
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134 #elif defined(__GNUC__)
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135 #define SDL_CompilerBarrier() __asm__ __volatile__ ("" : : : "memory")
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136 #else
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137 #define SDL_CompilerBarrier() \
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138 ({ SDL_SpinLock _tmp = 0; SDL_AtomicLock(&_tmp); SDL_AtomicUnlock(&_tmp); })
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139 #endif
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140
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141 /* Platform specific optimized versions of the atomic functions,
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142 * you can disable these by defining SDL_DISABLE_ATOMIC_INLINE
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143 */
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144 #ifndef SDL_DISABLE_ATOMIC_INLINE
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145
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146 #ifdef HAVE_MSC_ATOMICS
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147
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148 #define SDL_AtomicSet(a, v) _InterlockedExchange((long*)&(a)->value, (v))
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149 #define SDL_AtomicAdd(a, v) _InterlockedExchangeAdd((long*)&(a)->value, (v))
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150 #define SDL_AtomicCAS(a, oldval, newval) (_InterlockedCompareExchange((long*)&(a)->value, (newval), (oldval)) == (oldval))
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151 #define SDL_AtomicSetPtr(a, v) _InterlockedExchangePointer((a), (v))
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152 #if _M_IX86
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153 #define SDL_AtomicCASPtr(a, oldval, newval) (_InterlockedCompareExchange((long*)(a), (long)(newval), (long)(oldval)) == (long)(oldval))
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154 #else
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155 #define SDL_AtomicCASPtr(a, oldval, newval) (_InterlockedCompareExchangePointer((a), (newval), (oldval)) == (oldval))
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156 #endif
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157
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158 #elif defined(__MACOSX__)
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159 #include <libkern/OSAtomic.h>
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160
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161 #define SDL_AtomicCAS(a, oldval, newval) OSAtomicCompareAndSwap32Barrier((oldval), (newval), &(a)->value)
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162 #if SIZEOF_VOIDP == 4
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163 #define SDL_AtomicCASPtr(a, oldval, newval) OSAtomicCompareAndSwap32Barrier((int32_t)(oldval), (int32_t)(newval), (int32_t*)(a))
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164 #elif SIZEOF_VOIDP == 8
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165 #define SDL_AtomicCASPtr(a, oldval, newval) OSAtomicCompareAndSwap64Barrier((int64_t)(oldval), (int64_t)(newval), (int64_t*)(a))
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166 #endif
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167
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168 #elif defined(HAVE_GCC_ATOMICS)
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169
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170 #define SDL_AtomicSet(a, v) __sync_lock_test_and_set(&(a)->value, v)
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171 #define SDL_AtomicAdd(a, v) __sync_fetch_and_add(&(a)->value, v)
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172 #define SDL_AtomicSetPtr(a, v) __sync_lock_test_and_set(a, v)
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173 #define SDL_AtomicCAS(a, oldval, newval) __sync_bool_compare_and_swap(&(a)->value, oldval, newval)
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174 #define SDL_AtomicCASPtr(a, oldval, newval) __sync_bool_compare_and_swap(a, oldval, newval)
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175
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176 #endif
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177
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178 #endif /* !SDL_DISABLE_ATOMIC_INLINE */
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179
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180
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181 /**
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182 * \brief A type representing an atomic integer value. It is a struct
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183 * so people don't accidentally use numeric operations on it.
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184 */
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185 #ifndef SDL_atomic_t_defined
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186 typedef struct { int value; } SDL_atomic_t;
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187 #endif
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188
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189 /**
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190 * \brief Set an atomic variable to a new value if it is currently an old value.
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191 *
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192 * \return SDL_TRUE if the atomic variable was set, SDL_FALSE otherwise.
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193 *
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194 * \note If you don't know what this function is for, you shouldn't use it!
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195 */
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196 #ifndef SDL_AtomicCAS
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197 #define SDL_AtomicCAS SDL_AtomicCAS_
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198 #endif
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199 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCAS_(SDL_atomic_t *a, int oldval, int newval);
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200
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201 /**
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202 * \brief Set an atomic variable to a value.
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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_AtomicSet
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207 static __inline__ int SDL_AtomicSet(SDL_atomic_t *a, int v)
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208 {
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209 int value;
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210 do {
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211 value = a->value;
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212 } while (!SDL_AtomicCAS(a, value, v));
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213 return value;
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214 }
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215 #endif
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216
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217 /**
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218 * \brief Get the value of an atomic variable
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219 */
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220 #ifndef SDL_AtomicGet
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221 static __inline__ int SDL_AtomicGet(SDL_atomic_t *a)
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222 {
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223 int value = a->value;
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224 SDL_CompilerBarrier();
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225 return value;
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226 }
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227 #endif
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228
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229 /**
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230 * \brief Add to an atomic variable.
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231 *
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232 * \return The previous value of the atomic variable.
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233 *
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234 * \note This same style can be used for any number operation
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235 */
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236 #ifndef SDL_AtomicAdd
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237 static __inline__ int SDL_AtomicAdd(SDL_atomic_t *a, int v)
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238 {
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239 int value;
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240 do {
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241 value = a->value;
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242 } while (!SDL_AtomicCAS(a, value, (value + v)));
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243 return value;
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244 }
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245 #endif
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246
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247 /**
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248 * \brief Increment an atomic variable used as a reference count.
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249 */
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250 #ifndef SDL_AtomicIncRef
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251 #define SDL_AtomicIncRef(a) SDL_AtomicAdd(a, 1)
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252 #endif
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253
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254 /**
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255 * \brief Decrement an atomic variable used as a reference count.
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256 *
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257 * \return SDL_TRUE if the variable reached zero after decrementing,
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258 * SDL_FALSE otherwise
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259 */
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260 #ifndef SDL_AtomicDecRef
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261 #define SDL_AtomicDecRef(a) (SDL_AtomicAdd(a, -1) == 1)
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262 #endif
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263
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264 /**
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265 * \brief Set a pointer to a new value if it is currently an old value.
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266 *
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267 * \return SDL_TRUE if the pointer was set, SDL_FALSE otherwise.
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268 *
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269 * \note If you don't know what this function is for, you shouldn't use it!
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270 */
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271 #ifndef SDL_AtomicCASPtr
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272 #define SDL_AtomicCASPtr SDL_AtomicCASPtr_
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273 #endif
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274 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCASPtr_(void* *a, void *oldval, void *newval);
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275
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276 /**
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277 * \brief Set a pointer to a value atomically.
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278 *
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279 * \return The previous value of the pointer.
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280 */
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281 #ifndef SDL_AtomicSetPtr
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282 static __inline__ void* SDL_AtomicSetPtr(void* *a, void* v)
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283 {
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284 void* value;
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285 do {
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286 value = *a;
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287 } while (!SDL_AtomicCASPtr(a, value, v));
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288 return value;
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289 }
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290 #endif
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291
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292 /**
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293 * \brief Get the value of a pointer atomically.
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294 */
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295 #ifndef SDL_AtomicGetPtr
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296 static __inline__ void* SDL_AtomicGetPtr(void* *a)
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297 {
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298 void* value = *a;
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299 SDL_CompilerBarrier();
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300 return value;
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301 }
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302 #endif
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303
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304
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305 /* Ends C function definitions when using C++ */
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306 #ifdef __cplusplus
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307 /* *INDENT-OFF* */
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308 }
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309 /* *INDENT-ON* */
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310 #endif
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311
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312 #include "close_code.h"
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313
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314 #endif /* _SDL_atomic_h_ */
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315
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316 /* vi: set ts=4 sw=4 expandtab: */