regress/sys/kern/sleeping/sleeptest.c

   1 /* $NetBSD: sleeptest.c,v 1.1 2006/07/16 19:19:39 kardel Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2006 Frank Kardel
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/event.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <time.h>
  33 #include <errno.h>
  34 #include <sys/signal.h>
  35 #include <string.h>
  36 #include <err.h>
  37
  38 #define FUZZ            30000000LL      /* scheduling fuzz accepted - 30 ms */
  39 #define MAXSLEEP        32000000000LL   /* 32 seconds */
  40 #define ALARM           11              /* SIGALRM after this time */
  41 #define KEVNT_TIMEOUT   13200
  42
  43 static int sig, sigs;
  44
  45 static char *sleepers[] = {
  46         "nanosleep",
  47         "select",
  48         "poll",
  49         "sleep",
  50         "kevent"
  51 };
  52
  53 #define N_SLEEPERS (sizeof(sleepers)/sizeof(sleepers[0]))
  54
  55 void
  56 sigalrm()
  57 {
  58         sig++;
  59 }
  60
  61 int
  62 main(int argc, char *argv[])
  63 {
  64         struct timespec tsa, tsb, tslp, tslplast, tremain;
  65         struct timeval tv;
  66         int64_t delta1, delta2, delta3, round;
  67         int errors = 0, i;
  68         char *rtype;
  69
  70         printf("Testing sleep/timeout implementations\n");
  71         printf("accepted scheduling delta %lld ms\n", FUZZ/ 1000000LL);
  72         printf("testing up to %lld ms for %d interfaces\n", MAXSLEEP / 1000000LL, N_SLEEPERS);
  73         printf("ALARM interrupt after %d sec once per run\n", ALARM);
  74         printf("kevent timer will fire after %d ms\n", KEVNT_TIMEOUT);
  75
  76         signal(SIGALRM, sigalrm);
  77
  78         for (i = 0; i < N_SLEEPERS; i++) {
  79                 switch (i) {
  80                 case 3: /* sleep has only second resolution */
  81                         round = 1000000000;
  82                         delta3 = round;
  83                         break;
  84                 default:
  85                         round = 1;
  86                         delta3 = FUZZ;
  87                         break;
  88                 }
  89                 sigs += sig;
  90                 sig = 0;
  91                 rtype = "simulated";
  92
  93                 tslp.tv_sec = delta3 / 1000000000;
  94                 tslp.tv_nsec = delta3 % 1000000000;
  95                 tslplast = tslp;
  96
  97                 while (delta3 <= MAXSLEEP) {
  98                         printf("[%s] sleeping %lld nsec ... ", sleepers[i], delta3);
  99                         /*
 100                          * disturb sleep by signal on purpose
 101                          */
 102                         if (delta3 > ALARM * 1000000000LL && sig == 0)
 103                                 alarm(ALARM);
 104
 105                         fflush(stdout);
 106                         clock_gettime(CLOCK_REALTIME, &tsa);
 107                         switch (i) {
 108                         case 0: /* nanosleep */
 109                                 rtype = "returned";
 110                                 if (nanosleep(&tslp, &tremain) == -1) {
 111                                         if (errno != EINTR)
 112                                                 errors++;
 113                                         printf("- errno=%s (%s) - ", strerror(errno), (errno == EINTR) ? "OK" : "ERROR");
 114                                 }
 115                                 clock_gettime(CLOCK_REALTIME, &tsb);
 116                                 break;
 117
 118                         case 1: /* select */
 119                                 TIMESPEC_TO_TIMEVAL(&tv, &tslp);
 120                                 if (select(0, NULL, NULL, NULL, &tv) == -1) {
 121                                         if (errno != EINTR)
 122                                                 errors++;
 123                                         printf("- errno=%s (%s) - ", strerror(errno), (errno == EINTR) ? "OK" : "ERROR");
 124                                 }
 125                                 /* simulate remaining time */
 126                                 clock_gettime(CLOCK_REALTIME, &tsb);
 127                                 timespecsub(&tsb, &tsa, &tremain);
 128                                 timespecsub(&tslp, &tremain, &tremain);
 129                                 break;
 130
 131                         case 2: /* poll */
 132                                 TIMESPEC_TO_TIMEVAL(&tv, &tslp);
 133                                 if (pollts(NULL, 0, &tslp, NULL) == -1) {
 134                                         if (errno != EINTR)
 135                                                 errors++;
 136                                         printf("- errno=%s (%s) - ", strerror(errno), (errno == EINTR) ? "OK" : "ERROR");
 137                                 }
 138                                 /* simulate remaining time */
 139                                 clock_gettime(CLOCK_REALTIME, &tsb);
 140                                 timespecsub(&tsb, &tsa, &tremain);
 141                                 timespecsub(&tslp, &tremain, &tremain);
 142                                 break;
 143
 144                         case 3: /* sleep */
 145                                 rtype = "returned";
 146                                 tremain.tv_sec = sleep(tslp.tv_sec);
 147                                 tremain.tv_nsec = 0;
 148                                 clock_gettime(CLOCK_REALTIME, &tsb);
 149                                 break;
 150
 151                         case 4: /* kevent */
 152                         {
 153                                 struct kevent ktimer;
 154                                 struct kevent kresult;
 155                                 int rtc, timeout = KEVNT_TIMEOUT;
 156                                 int kq = kqueue();
 157
 158                                 if (kq == -1) {
 159                                         err(EXIT_FAILURE, "kqueue");
 160                                 }
 161
 162                                 EV_SET(&ktimer, 1, EVFILT_TIMER, EV_ADD, 0, timeout, 0);
 163
 164                                 rtc = kevent(kq, &ktimer, 1, &kresult, 1, &tslp);
 165                                 if (rtc == -1) {
 166                                         if (errno != EINTR)
 167                                                 errors++;
 168                                         printf("- errno=%s (%s) - ", strerror(errno), (errno == EINTR) ? "OK" : "ERROR");
 169                                 }
 170                                 clock_gettime(CLOCK_REALTIME, &tsb);
 171                                 if (rtc == 0) {
 172                                         printf("- not fired");
 173                                         if (tslp.tv_sec * 1000000000LL + tslp.tv_nsec -
 174                                             timeout * 1000000LL > 0) {
 175                                                 printf(" - TIMING ERROR");
 176                                                 errors++;
 177                                         }
 178                                         printf(" - ");
 179                                 } else if (rtc > 0) {
 180                                         printf("- fired - ");
 181                                 }
 182                                 timespecsub(&tsb, &tsa, &tremain);
 183                                 timespecsub(&tslp, &tremain, &tremain);
 184                                 (void)close(kq);
 185                         }
 186                         break;
 187
 188                         default:
 189                                 errx(EXIT_FAILURE, "programming error - sleep method to test not implemented\n");
 190                         }
 191
 192                         delta1 = ((int64_t)tsb.tv_sec - (int64_t)tsa.tv_sec) * 1000000000LL + (int64_t)tsb.tv_nsec - (int64_t)tsa.tv_nsec;
 193                         delta2 = (((int64_t)tremain.tv_sec * 1000000000LL) + (int64_t)tremain.tv_nsec);
 194                         delta3 = (int64_t)tslp.tv_sec * 1000000000LL + (int64_t)tslp.tv_nsec - delta1 - delta2;
 195                         printf("sig %d, real time sleep %lld nsec, remain(%s) %lld nsec, diff to supposed sleep %lld nsec (rounded %lld nsec)",
 196                                sigs + sig, delta1, rtype, delta2, delta3, (delta3 / round) * round);
 197                         fflush(stdout);
 198                         delta3 /= round;
 199                         delta3 *= round;
 200                         if (delta3 > FUZZ || delta3 < -FUZZ) {
 201                                 errors++;
 202                                 printf(" ERROR\n");
 203                                 delta3 = ((int64_t)tslp.tv_sec + (int64_t)tslplast.tv_sec) * 1000000000LL + (int64_t)tslplast.tv_nsec
 204                                         + (int64_t)tslp.tv_nsec;
 205                                 delta3 /= 2;
 206                         } else {
 207                                 printf(" OK\n");
 208                                 tslplast = tslp;
 209                                 delta3 = ((int64_t)tslp.tv_sec + (int64_t)tslplast.tv_sec) * 1000000000LL + (int64_t)tslplast.tv_nsec
 210                                         + (int64_t)tslp.tv_nsec;
 211                         }
 212                         delta3 /= round;
 213                         delta3 *= round;
 214                         if (delta3 < FUZZ)
 215                                 break;
 216                         tslp.tv_sec = delta3 / 1000000000LL;
 217                         tslp.tv_nsec = delta3 % 1000000000LL;
 218                 }
 219         }
 220         sigs += sig;
 221
 222         if (errors || sigs != N_SLEEPERS) {
 223                 printf("TEST FAIL (%d errors, %d alarms, %d interfaces)\n", errors, sigs, N_SLEEPERS);
 224                 return 1;
 225         } else {
 226                 printf("TEST SUCCESSFUL\n");
 227                 return 0;
 228         }
 229 }