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annotate test/testatomic.c @ 5010:377b7d9d24ee

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Added testatomic test project
author Sam Lantinga <slouken@libsdl.org>
date Mon, 17 Jan 2011 13:42:24 -0800
parents 8e8876e4aec6
children 9d6b527e0912
rev   line source
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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 }