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annotate test/testatomic.c @ 5018:342b158efbbe

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Michael gave permission to use his test code
author Sam Lantinga <slouken@libsdl.org>
date Tue, 18 Jan 2011 10:57:28 -0800
parents 9d6b527e0912
children 470ede30189c
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_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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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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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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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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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 /**************************************************************************/
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72 /* Atomic operation test
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73 * Adapted with permission from code by Michael Davidsaver at:
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74 * http://bazaar.launchpad.net/~mdavidsaver/epics-base/atomic/revision/12105#src/libCom/test/epicsAtomicTest.c
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75 * Original copyright 2010 Brookhaven Science Associates as operator of Brookhaven National Lab
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76 * http://www.aps.anl.gov/epics/license/open.php
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77 */
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78
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79 /* Tests semantics of atomic operations. Also a stress test
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80 * to see if they are really atomic.
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81 *
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82 * Serveral threads adding to the same variable.
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83 * at the end the value is compared with the expected
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84 * and with a non-atomic counter.
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85 */
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86
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87 /* Number of concurrent incrementers */
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88 #define NThreads 2
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89 #define CountInc 100
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90 #define VALBITS (sizeof(atomicValue)*8)
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91
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92 #define atomicValue int
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93 #define CountTo ((atomicValue)((unsigned int)(1<<(VALBITS-1))-1))
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94 #define NInter (CountTo/CountInc/NThreads)
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95 #define Expect (CountTo-NInter*CountInc*NThreads)
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96
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97 SDL_COMPILE_TIME_ASSERT(size, CountTo>0); /* check for rollover */
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98
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99 static SDL_atomic_t good = { 42 };
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100
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101 static atomicValue bad = 42;
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102
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103 static SDL_atomic_t threadsRunning;
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104
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105 static SDL_sem *threadDone;
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106
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107 static
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108 int adder(void* junk)
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109 {
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110 unsigned long N=NInter;
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111 printf("Thread subtracting %d %lu times\n",CountInc,N);
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112 while (N--) {
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113 SDL_AtomicAdd(&good, -CountInc);
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114 bad-=CountInc;
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115 }
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116 SDL_AtomicAdd(&threadsRunning, -1);
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117 SDL_SemPost(threadDone);
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118 return 0;
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119 }
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120
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121 static
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122 void runAdder(void)
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123 {
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124 Uint32 start, end;
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125 int T=NThreads;
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126
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127 start = SDL_GetTicks();
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128
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129 threadDone = SDL_CreateSemaphore(0);
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130
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131 SDL_AtomicSet(&threadsRunning, NThreads);
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132
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133 while (T--)
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134 SDL_CreateThread(adder, NULL);
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135
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136 while (SDL_AtomicGet(&threadsRunning) > 0)
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137 SDL_SemWait(threadDone);
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138
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139 SDL_DestroySemaphore(threadDone);
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140
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141 end = SDL_GetTicks();
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142
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143 printf("Finished in %f sec\n", (end - start) / 1000.f);
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144 }
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145
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146 static
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147 void RunEpicTest()
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148 {
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149 int b;
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150 atomicValue v;
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151
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152 printf("\nepic test---------------------------------------\n\n");
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153
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154 printf("Size asserted to be >= 32-bit\n");
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155 SDL_assert(sizeof(atomicValue)>=4);
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156
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157 printf("Check static initializer\n");
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158 v=SDL_AtomicGet(&good);
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159 SDL_assert(v==42);
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160
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161 SDL_assert(bad==42);
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162
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163 printf("Test negative values\n");
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164 SDL_AtomicSet(&good, -5);
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165 v=SDL_AtomicGet(&good);
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166 SDL_assert(v==-5);
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167
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168 printf("Verify maximum value\n");
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169 SDL_AtomicSet(&good, CountTo);
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170 v=SDL_AtomicGet(&good);
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171 SDL_assert(v==CountTo);
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172
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173 printf("Test compare and exchange\n");
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174
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175 b=SDL_AtomicCAS(&good, 500, 43);
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176 SDL_assert(!b); /* no swap since CountTo!=500 */
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177 v=SDL_AtomicGet(&good);
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178 SDL_assert(v==CountTo); /* ensure no swap */
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179
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180 b=SDL_AtomicCAS(&good, CountTo, 44);
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181 SDL_assert(!!b); /* will swap */
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182 v=SDL_AtomicGet(&good);
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183 SDL_assert(v==44);
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184
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185 printf("Test Add\n");
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186
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187 v=SDL_AtomicAdd(&good, 1);
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188 SDL_assert(v==44);
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189 v=SDL_AtomicGet(&good);
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190 SDL_assert(v==45);
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191
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192 v=SDL_AtomicAdd(&good, 10);
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193 SDL_assert(v==45);
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194 v=SDL_AtomicGet(&good);
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195 SDL_assert(v==55);
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196
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197 printf("Test Add (Negative values)\n");
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198
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199 v=SDL_AtomicAdd(&good, -20);
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200 SDL_assert(v==55);
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201 v=SDL_AtomicGet(&good);
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202 SDL_assert(v==35);
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203
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204 v=SDL_AtomicAdd(&good, -50); /* crossing zero down */
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205 SDL_assert(v==35);
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206 v=SDL_AtomicGet(&good);
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207 SDL_assert(v==-15);
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208
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209 v=SDL_AtomicAdd(&good, 30); /* crossing zero up */
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210 SDL_assert(v==-15);
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211 v=SDL_AtomicGet(&good);
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212 SDL_assert(v==15);
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213
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diff changeset
214 printf("Reset before count down test\n");
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215 SDL_AtomicSet(&good, CountTo);
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216 v=SDL_AtomicGet(&good);
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217 SDL_assert(v==CountTo);
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218
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219 bad=CountTo;
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220 SDL_assert(bad==CountTo);
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221
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222 printf("Counting down from %d, Expect %d remaining\n",CountTo,Expect);
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diff changeset
223 runAdder();
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diff changeset
224
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225 v=SDL_AtomicGet(&good);
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226 printf("Atomic %d Non-Atomic %d\n",v,bad);
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227 SDL_assert(v==Expect);
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228 SDL_assert(bad!=Expect);
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229 }
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230
5018
342b158efbbe Michael gave permission to use his test code
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231 /* End atomic operation test */
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232 /**************************************************************************/
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233
5004
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diff changeset
234 int
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diff changeset
235 main(int argc, char *argv[])
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236 {
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237 RunBasicTest();
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238 RunEpicTest();
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diff changeset
239 return 0;
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240 }