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annotate test/testatomic.c @ 5006:8e8876e4aec6

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Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h This allows all SDL code to take advantage of the atomic intrinsics on Windows, but doesn't cause applications just including SDL.h to pull in windows.h
author Sam Lantinga <slouken@libsdl.org>
date Sun, 16 Jan 2011 17:45:42 -0800
parents 0c72ae7b7cb2
children 9d6b527e0912
rev   line source
3338
9de326b3099c Fixed bug #817
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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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3 #include "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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7 /*
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8 Absolutely basic tests just to see if we get the expected value
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9 after calling each function.
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10 */
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11
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12 static
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13 char *
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14 tf(SDL_bool tf)
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15 {
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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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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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33 SDL_bool tfret = SDL_FALSE;
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34
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35 printf("\nspin lock---------------------------------------\n\n");
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36
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37 SDL_AtomicLock(&lock);
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38 printf("AtomicLock lock=%d\n", lock);
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39 SDL_AtomicUnlock(&lock);
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40 printf("AtomicUnlock lock=%d\n", lock);
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41
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42 printf("\natomic -----------------------------------------\n\n");
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43
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44 SDL_atomic_t v;
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45
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46 SDL_AtomicSet(&v, 0);
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47 tfret = SDL_AtomicSet(&v, 10) == 0;
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48 printf("AtomicSet(10) tfret=%s val=%"PRIu32"\n", tf(tfret), SDL_AtomicGet(&v));
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49 tfret = SDL_AtomicAdd(&v, 10) == 10;
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50 printf("AtomicAdd(10) tfret=%s val=%"PRIu32"\n", tf(tfret), SDL_AtomicGet(&v));
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51
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52 SDL_AtomicSet(&v, 0);
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53 SDL_AtomicIncRef(&v);
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54 tfret = (SDL_AtomicGet(&v) == 1);
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55 printf("AtomicIncRef() tfret=%s val=%"PRIu32"\n", tf(tfret), SDL_AtomicGet(&v));
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56 SDL_AtomicIncRef(&v);
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57 tfret = (SDL_AtomicGet(&v) == 2);
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58 printf("AtomicIncRef() tfret=%s val=%"PRIu32"\n", tf(tfret), SDL_AtomicGet(&v));
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59 tfret = (SDL_AtomicDecRef(&v) == SDL_FALSE);
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60 printf("AtomicDecRef() tfret=%s val=%"PRIu32"\n", tf(tfret), SDL_AtomicGet(&v));
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61 tfret = (SDL_AtomicDecRef(&v) == SDL_TRUE);
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62 printf("AtomicDecRef() tfret=%s val=%"PRIu32"\n", tf(tfret), SDL_AtomicGet(&v));
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63
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64 SDL_AtomicSet(&v, 10);
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65 tfret = (SDL_AtomicCAS(&v, 0, 20) == SDL_FALSE);
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66 printf("AtomicCAS() tfret=%s val=%"PRIu32"\n", tf(tfret), SDL_AtomicGet(&v));
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67 value = SDL_AtomicGet(&v);
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68 tfret = (SDL_AtomicCAS(&v, value, 20) == SDL_TRUE);
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69 printf("AtomicCAS() tfret=%s val=%"PRIu32"\n", tf(tfret), SDL_AtomicGet(&v));
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70 }
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71
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72 /* Atomic operation test, adapted from code by Michael Davidsaver at:
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73 http://bazaar.launchpad.net/~mdavidsaver/epics-base/atomic/revision/12105#src/libCom/test/epicsAtomicTest.c
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74 */
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75
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76 /* Tests semantics of atomic operations. Also a stress test
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77 * to see if they are really atomic.
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78 *
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79 * Serveral threads adding to the same variable.
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80 * at the end the value is compared with the expected
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81 * and with a non-atomic counter.
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82 */
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83
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84 /* Number of concurrent incrementers */
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85 #define NThreads 2
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86 #define CountInc 100
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87 #define VALBITS (sizeof(atomicValue)*8)
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88
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89 #define atomicValue int
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90 #define CountTo ((atomicValue)((unsigned int)(1<<(VALBITS-1))-1))
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91 #define NInter (CountTo/CountInc/NThreads)
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92 #define Expect (CountTo-NInter*CountInc*NThreads)
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93
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94 SDL_COMPILE_TIME_ASSERT(size, CountTo>0); /* check for rollover */
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95
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96 static SDL_atomic_t good = { 42 };
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97
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98 static atomicValue bad = 42;
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99
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100 static SDL_atomic_t threadsRunning;
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101
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102 static SDL_sem *threadDone;
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103
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104 static
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105 int adder(void* junk)
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106 {
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107 unsigned long N=NInter;
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108 printf("Thread subtracting %d %lu times\n",CountInc,N);
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109 while (N--) {
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110 SDL_AtomicAdd(&good, -CountInc);
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111 bad-=CountInc;
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112 }
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113 SDL_AtomicAdd(&threadsRunning, -1);
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114 SDL_SemPost(threadDone);
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115 return 0;
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116 }
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117
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118 static
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119 void runAdder(void)
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120 {
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121 Uint32 start, end;
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122 int T=NThreads;
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123
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124 start = SDL_GetTicks();
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125
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126 threadDone = SDL_CreateSemaphore(0);
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127
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128 SDL_AtomicSet(&threadsRunning, NThreads);
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129
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130 while (T--)
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131 SDL_CreateThread(adder, NULL);
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132
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133 while (SDL_AtomicGet(&threadsRunning) > 0)
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134 SDL_SemWait(threadDone);
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135
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136 SDL_DestroySemaphore(threadDone);
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137
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138 end = SDL_GetTicks();
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139
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140 printf("Finished in %f sec\n", (end - start) / 1000.f);
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141 }
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142
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143 static
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144 void RunEpicTest()
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145 {
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146 int b;
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147 atomicValue v;
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148
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149 printf("\nepic test---------------------------------------\n\n");
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150
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151 printf("Size asserted to be >= 32-bit\n");
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152 SDL_assert(sizeof(atomicValue)>=4);
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153
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154 printf("Check static initializer\n");
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155 v=SDL_AtomicGet(&good);
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156 SDL_assert(v==42);
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157
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158 SDL_assert(bad==42);
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159
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160 printf("Test negative values\n");
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161 SDL_AtomicSet(&good, -5);
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162 v=SDL_AtomicGet(&good);
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163 SDL_assert(v==-5);
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164
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165 printf("Verify maximum value\n");
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166 SDL_AtomicSet(&good, CountTo);
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167 v=SDL_AtomicGet(&good);
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168 SDL_assert(v==CountTo);
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169
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170 printf("Test compare and exchange\n");
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171
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172 b=SDL_AtomicCAS(&good, 500, 43);
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173 SDL_assert(!b); /* no swap since CountTo!=500 */
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174 v=SDL_AtomicGet(&good);
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175 SDL_assert(v==CountTo); /* ensure no swap */
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176
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177 b=SDL_AtomicCAS(&good, CountTo, 44);
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178 SDL_assert(!!b); /* will swap */
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179 v=SDL_AtomicGet(&good);
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180 SDL_assert(v==44);
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181
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182 printf("Test Add\n");
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183
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184 v=SDL_AtomicAdd(&good, 1);
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185 SDL_assert(v==44);
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186 v=SDL_AtomicGet(&good);
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187 SDL_assert(v==45);
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188
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189 v=SDL_AtomicAdd(&good, 10);
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190 SDL_assert(v==45);
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191 v=SDL_AtomicGet(&good);
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192 SDL_assert(v==55);
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193
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194 printf("Test Add (Negative values)\n");
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195
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196 v=SDL_AtomicAdd(&good, -20);
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197 SDL_assert(v==55);
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198 v=SDL_AtomicGet(&good);
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199 SDL_assert(v==35);
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200
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201 v=SDL_AtomicAdd(&good, -50); /* crossing zero down */
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202 SDL_assert(v==35);
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203 v=SDL_AtomicGet(&good);
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204 SDL_assert(v==-15);
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205
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206 v=SDL_AtomicAdd(&good, 30); /* crossing zero up */
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207 SDL_assert(v==-15);
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208 v=SDL_AtomicGet(&good);
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209 SDL_assert(v==15);
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210
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211 printf("Reset before count down test\n");
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212 SDL_AtomicSet(&good, CountTo);
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213 v=SDL_AtomicGet(&good);
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214 SDL_assert(v==CountTo);
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215
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216 bad=CountTo;
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217 SDL_assert(bad==CountTo);
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218
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219 printf("Counting down from %d, Expect %d remaining\n",CountTo,Expect);
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220 runAdder();
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221
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222 v=SDL_AtomicGet(&good);
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223 printf("Atomic %d Non-Atomic %d\n",v,bad);
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224 SDL_assert(v==Expect);
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225 SDL_assert(bad!=Expect);
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226 }
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227
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228 int
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229 main(int argc, char *argv[])
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230 {
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231 RunBasicTest();
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232 RunEpicTest();
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233 return 0;
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234 }