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annotate test/testatomic.c @ 5013:9d6b527e0912

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Fixed compiler errors
author Sam Lantinga <slouken@libsdl.org>
date Mon, 17 Jan 2011 13:54:13 -0800
parents 8e8876e4aec6
children 342b158efbbe
rev   line source
3338
9de326b3099c Fixed bug #817
Sam Lantinga <slouken@libsdl.org>
parents: 3327
diff changeset
1 #include <stdio.h>
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8e8876e4aec6 Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h
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2
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77d6336711fc First commit for SDL atomic operations.
Bob Pendleton <bob@pendleton.com>
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3 #include "SDL.h"
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8e8876e4aec6 Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h
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4 #include "SDL_atomic.h"
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5 #include "SDL_assert.h"
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6
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c297230efc75 Disabling 64 bit atomics operations until I figure out why they do not link.
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7 /*
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3aa519a5c676 I've made so many changes I don't dare continue until I check the current stuff in.
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8 Absolutely basic tests just to see if we get the expected value
3aa519a5c676 I've made so many changes I don't dare continue until I check the current stuff in.
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9 after calling each function.
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c297230efc75 Disabling 64 bit atomics operations until I figure out why they do not link.
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10 */
c297230efc75 Disabling 64 bit atomics operations until I figure out why they do not link.
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11
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12 static
3338
9de326b3099c Fixed bug #817
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13 char *
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3aa519a5c676 I've made so many changes I don't dare continue until I check the current stuff in.
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14 tf(SDL_bool tf)
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15 {
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3a95a2b93eb3 Updated the atomic API for better use cases
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16 static char *t = "TRUE";
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17 static char *f = "FALSE";
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18
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19 if (tf)
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20 {
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21 return t;
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22 }
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23
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24 return f;
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25 }
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9de326b3099c Fixed bug #817
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26
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27 static
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28 void RunBasicTest()
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29 {
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30 int value;
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31 SDL_SpinLock lock = 0;
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72b542f34739 The new, cleaner, version of the atomic operations. The dummy code is what you should start working with to port atomic ops.
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32
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9d6b527e0912 Fixed compiler errors
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33 SDL_atomic_t v;
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34 SDL_bool tfret = SDL_FALSE;
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35
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36 printf("\nspin lock---------------------------------------\n\n");
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37
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38 SDL_AtomicLock(&lock);
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39 printf("AtomicLock lock=%d\n", lock);
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40 SDL_AtomicUnlock(&lock);
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41 printf("AtomicUnlock lock=%d\n", lock);
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42
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43 printf("\natomic -----------------------------------------\n\n");
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44
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45 SDL_AtomicSet(&v, 0);
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46 tfret = SDL_AtomicSet(&v, 10) == 0;
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9d6b527e0912 Fixed compiler errors
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47 printf("AtomicSet(10) tfret=%s val=%d\n", tf(tfret), SDL_AtomicGet(&v));
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48 tfret = SDL_AtomicAdd(&v, 10) == 10;
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49 printf("AtomicAdd(10) tfret=%s val=%d\n", tf(tfret), SDL_AtomicGet(&v));
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50
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51 SDL_AtomicSet(&v, 0);
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52 SDL_AtomicIncRef(&v);
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53 tfret = (SDL_AtomicGet(&v) == 1);
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9d6b527e0912 Fixed compiler errors
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54 printf("AtomicIncRef() tfret=%s val=%d\n", tf(tfret), SDL_AtomicGet(&v));
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55 SDL_AtomicIncRef(&v);
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56 tfret = (SDL_AtomicGet(&v) == 2);
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9d6b527e0912 Fixed compiler errors
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57 printf("AtomicIncRef() tfret=%s val=%d\n", tf(tfret), SDL_AtomicGet(&v));
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58 tfret = (SDL_AtomicDecRef(&v) == SDL_FALSE);
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9d6b527e0912 Fixed compiler errors
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59 printf("AtomicDecRef() tfret=%s val=%d\n", tf(tfret), SDL_AtomicGet(&v));
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60 tfret = (SDL_AtomicDecRef(&v) == SDL_TRUE);
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61 printf("AtomicDecRef() tfret=%s val=%d\n", tf(tfret), SDL_AtomicGet(&v));
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62
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63 SDL_AtomicSet(&v, 10);
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64 tfret = (SDL_AtomicCAS(&v, 0, 20) == SDL_FALSE);
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65 printf("AtomicCAS() tfret=%s val=%d\n", tf(tfret), SDL_AtomicGet(&v));
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66 value = SDL_AtomicGet(&v);
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67 tfret = (SDL_AtomicCAS(&v, value, 20) == SDL_TRUE);
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68 printf("AtomicCAS() tfret=%s val=%d\n", tf(tfret), SDL_AtomicGet(&v));
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69 }
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70
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71 /* Atomic operation test, adapted from code by Michael Davidsaver at:
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72 http://bazaar.launchpad.net/~mdavidsaver/epics-base/atomic/revision/12105#src/libCom/test/epicsAtomicTest.c
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73 */
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74
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75 /* Tests semantics of atomic operations. Also a stress test
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76 * to see if they are really atomic.
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77 *
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78 * Serveral threads adding to the same variable.
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79 * at the end the value is compared with the expected
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80 * and with a non-atomic counter.
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81 */
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82
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83 /* Number of concurrent incrementers */
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84 #define NThreads 2
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85 #define CountInc 100
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86 #define VALBITS (sizeof(atomicValue)*8)
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87
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88 #define atomicValue int
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89 #define CountTo ((atomicValue)((unsigned int)(1<<(VALBITS-1))-1))
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90 #define NInter (CountTo/CountInc/NThreads)
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91 #define Expect (CountTo-NInter*CountInc*NThreads)
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92
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93 SDL_COMPILE_TIME_ASSERT(size, CountTo>0); /* check for rollover */
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94
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95 static SDL_atomic_t good = { 42 };
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96
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97 static atomicValue bad = 42;
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98
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99 static SDL_atomic_t threadsRunning;
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100
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101 static SDL_sem *threadDone;
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102
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103 static
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104 int adder(void* junk)
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105 {
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106 unsigned long N=NInter;
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107 printf("Thread subtracting %d %lu times\n",CountInc,N);
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108 while (N--) {
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109 SDL_AtomicAdd(&good, -CountInc);
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110 bad-=CountInc;
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111 }
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112 SDL_AtomicAdd(&threadsRunning, -1);
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113 SDL_SemPost(threadDone);
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114 return 0;
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115 }
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116
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117 static
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118 void runAdder(void)
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119 {
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120 Uint32 start, end;
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121 int T=NThreads;
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122
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123 start = SDL_GetTicks();
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124
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125 threadDone = SDL_CreateSemaphore(0);
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126
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127 SDL_AtomicSet(&threadsRunning, NThreads);
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128
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129 while (T--)
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130 SDL_CreateThread(adder, NULL);
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131
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132 while (SDL_AtomicGet(&threadsRunning) > 0)
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133 SDL_SemWait(threadDone);
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134
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135 SDL_DestroySemaphore(threadDone);
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136
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137 end = SDL_GetTicks();
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138
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139 printf("Finished in %f sec\n", (end - start) / 1000.f);
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140 }
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141
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142 static
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143 void RunEpicTest()
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144 {
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145 int b;
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146 atomicValue v;
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147
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148 printf("\nepic test---------------------------------------\n\n");
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149
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150 printf("Size asserted to be >= 32-bit\n");
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151 SDL_assert(sizeof(atomicValue)>=4);
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152
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153 printf("Check static initializer\n");
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154 v=SDL_AtomicGet(&good);
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155 SDL_assert(v==42);
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156
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157 SDL_assert(bad==42);
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158
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159 printf("Test negative values\n");
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160 SDL_AtomicSet(&good, -5);
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161 v=SDL_AtomicGet(&good);
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162 SDL_assert(v==-5);
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163
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164 printf("Verify maximum value\n");
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165 SDL_AtomicSet(&good, CountTo);
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166 v=SDL_AtomicGet(&good);
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167 SDL_assert(v==CountTo);
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168
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169 printf("Test compare and exchange\n");
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170
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171 b=SDL_AtomicCAS(&good, 500, 43);
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172 SDL_assert(!b); /* no swap since CountTo!=500 */
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173 v=SDL_AtomicGet(&good);
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174 SDL_assert(v==CountTo); /* ensure no swap */
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175
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176 b=SDL_AtomicCAS(&good, CountTo, 44);
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177 SDL_assert(!!b); /* will swap */
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178 v=SDL_AtomicGet(&good);
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179 SDL_assert(v==44);
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180
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181 printf("Test Add\n");
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182
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183 v=SDL_AtomicAdd(&good, 1);
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184 SDL_assert(v==44);
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185 v=SDL_AtomicGet(&good);
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186 SDL_assert(v==45);
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187
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188 v=SDL_AtomicAdd(&good, 10);
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189 SDL_assert(v==45);
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190 v=SDL_AtomicGet(&good);
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191 SDL_assert(v==55);
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192
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193 printf("Test Add (Negative values)\n");
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194
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195 v=SDL_AtomicAdd(&good, -20);
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196 SDL_assert(v==55);
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197 v=SDL_AtomicGet(&good);
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198 SDL_assert(v==35);
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199
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200 v=SDL_AtomicAdd(&good, -50); /* crossing zero down */
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201 SDL_assert(v==35);
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202 v=SDL_AtomicGet(&good);
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203 SDL_assert(v==-15);
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204
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205 v=SDL_AtomicAdd(&good, 30); /* crossing zero up */
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206 SDL_assert(v==-15);
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207 v=SDL_AtomicGet(&good);
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208 SDL_assert(v==15);
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209
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210 printf("Reset before count down test\n");
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211 SDL_AtomicSet(&good, CountTo);
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212 v=SDL_AtomicGet(&good);
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213 SDL_assert(v==CountTo);
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214
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215 bad=CountTo;
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216 SDL_assert(bad==CountTo);
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217
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218 printf("Counting down from %d, Expect %d remaining\n",CountTo,Expect);
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219 runAdder();
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220
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221 v=SDL_AtomicGet(&good);
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222 printf("Atomic %d Non-Atomic %d\n",v,bad);
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223 SDL_assert(v==Expect);
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224 SDL_assert(bad!=Expect);
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225 }
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226
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227 int
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228 main(int argc, char *argv[])
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229 {
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230 RunBasicTest();
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231 RunEpicTest();
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232 return 0;
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233 }