t_sleep.c revision 1.14
1 /* $NetBSD: t_sleep.c,v 1.14 2025/04/08 01:29:08 riastradh 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/cdefs.h> 30 #include <sys/event.h> 31 #include <sys/signal.h> 32 #include <sys/time.h> /* for TIMESPEC_TO_TIMEVAL on FreeBSD */ 33 34 #include <atf-c.h> 35 #include <errno.h> 36 #include <inttypes.h> 37 #include <poll.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <time.h> 42 #include <unistd.h> 43 44 #include "isqemu.h" 45 46 #define BILLION 1000000000LL /* nano-seconds per second */ 47 #define MILLION 1000000LL /* nano-seconds per milli-second */ 48 49 #define ALARM 6 /* SIGALRM after this many seconds */ 50 #define MAXSLEEP 22 /* Maximum delay in seconds */ 51 #define KEVNT_TIMEOUT 10300 /* measured in milli-seconds */ 52 #define FUZZ (40 * MILLION) /* scheduling fuzz accepted - 40 ms */ 53 54 /* 55 * Timer notes 56 * 57 * Most tests use FUZZ as their initial delay value, but 'sleep' 58 * starts at 1sec (since it cannot handle sub-second intervals). 59 * Subsequent passes double the previous interval, up to MAXSLEEP. 60 * 61 * The current values result in 5 passes for the 'sleep' test (at 1, 62 * 2, 4, 8, and 16 seconds) and 10 passes for the other tests (at 63 * 0.04, 0.08, 0.16, 0.32, 0.64, 1.28, 2.56, 5.12, 10.24, and 20.48 64 * seconds). 65 * 66 * The ALARM is only set if the current pass's delay is longer, and 67 * only if the ALARM has not already been triggered. 68 * 69 * The 'kevent' test needs the ALARM to be set on a different pass 70 * from when the KEVNT_TIMEOUT fires. So set ALARM to fire on the 71 * penultimate pass, and the KEVNT_TIMEOUT on the final pass. We 72 * set KEVNT_TIMEOUT just barely long enough to put it into the 73 * last test pass, and set MAXSLEEP a couple seconds longer than 74 * necessary, in order to avoid a QEMU bug which nearly doubles 75 * some timers. 76 */ 77 78 static volatile int sig; 79 80 int sleeptest(int (*)(struct timespec *, struct timespec *), bool, bool); 81 int do_nanosleep(struct timespec *, struct timespec *); 82 int do_select(struct timespec *, struct timespec *); 83 int do_poll(struct timespec *, struct timespec *); 84 int do_sleep(struct timespec *, struct timespec *); 85 int do_kevent(struct timespec *, struct timespec *); 86 void sigalrm(int); 87 88 void 89 sigalrm(int s) 90 { 91 92 sig++; 93 } 94 95 int 96 do_nanosleep(struct timespec *delay, struct timespec *remain) 97 { 98 int ret; 99 100 if (nanosleep(delay, remain) == -1) 101 ret = (errno == EINTR ? 0 : errno); 102 else 103 ret = 0; 104 return ret; 105 } 106 107 int 108 do_select(struct timespec *delay, struct timespec *remain) 109 { 110 int ret; 111 struct timeval tv; 112 113 TIMESPEC_TO_TIMEVAL(&tv, delay); 114 if (select(0, NULL, NULL, NULL, &tv) == -1) 115 ret = (errno == EINTR ? 0 : errno); 116 else 117 ret = 0; 118 return ret; 119 } 120 121 int 122 do_poll(struct timespec *delay, struct timespec *remain) 123 { 124 int ret; 125 struct timeval tv; 126 127 TIMESPEC_TO_TIMEVAL(&tv, delay); 128 if (pollts(NULL, 0, delay, NULL) == -1) 129 ret = (errno == EINTR ? 0 : errno); 130 else 131 ret = 0; 132 return ret; 133 } 134 135 int 136 do_sleep(struct timespec *delay, struct timespec *remain) 137 { 138 struct timeval tv; 139 140 TIMESPEC_TO_TIMEVAL(&tv, delay); 141 remain->tv_sec = sleep(delay->tv_sec); 142 remain->tv_nsec = 0; 143 144 return 0; 145 } 146 147 int 148 do_kevent(struct timespec *delay, struct timespec *remain) 149 { 150 struct kevent ktimer; 151 struct kevent kresult; 152 int rtc, kq, kerrno; 153 int tmo; 154 155 ATF_REQUIRE_MSG((kq = kqueue()) != -1, "kqueue: %s", strerror(errno)); 156 157 tmo = KEVNT_TIMEOUT; 158 159 /* 160 * If we expect the KEVNT_TIMEOUT to fire, and we're running 161 * under QEMU, make sure the delay is long enough to account 162 * for the effects of PR kern/43997 ! 163 */ 164 if (isQEMU() && 165 tmo/1000 < delay->tv_sec && tmo/500 > delay->tv_sec) 166 delay->tv_sec = MAXSLEEP; 167 168 fprintf(stderr, "kevent: set EVFILT_TIMER tmo=%d\n", tmo); 169 EV_SET(&ktimer, 1, EVFILT_TIMER, EV_ADD, 0, tmo, 0); 170 171 fprintf(stderr, "kevent: wait up to %lld.%09ld sec\n", 172 (long long)delay->tv_sec, (long)delay->tv_nsec); 173 rtc = kevent(kq, &ktimer, 1, &kresult, 1, delay); 174 kerrno = errno; 175 fprintf(stderr, "kevent returned rtc=%d\n", rtc); 176 177 (void)close(kq); 178 179 if (rtc == -1) { 180 ATF_REQUIRE_MSG(kerrno == EINTR, "kevent: %s", 181 strerror(kerrno)); 182 return 0; 183 } 184 185 if (delay->tv_sec * BILLION + delay->tv_nsec > tmo * MILLION) 186 ATF_CHECK_MSG(rtc > 0, 187 "kevent: KEVNT_TIMEOUT did not cause EVFILT_TIMER event"); 188 189 return 0; 190 } 191 192 ATF_TC(nanosleep); 193 ATF_TC_HEAD(nanosleep, tc) 194 { 195 196 atf_tc_set_md_var(tc, "descr", "Test nanosleep(2) timing"); 197 atf_tc_set_md_var(tc, "timeout", "65"); 198 } 199 200 ATF_TC_BODY(nanosleep, tc) 201 { 202 203 sleeptest(do_nanosleep, true, false); 204 } 205 206 ATF_TC(select); 207 ATF_TC_HEAD(select, tc) 208 { 209 210 atf_tc_set_md_var(tc, "descr", "Test select(2) timing"); 211 atf_tc_set_md_var(tc, "timeout", "65"); 212 } 213 214 ATF_TC_BODY(select, tc) 215 { 216 217 sleeptest(do_select, true, true); 218 } 219 220 ATF_TC(poll); 221 ATF_TC_HEAD(poll, tc) 222 { 223 224 atf_tc_set_md_var(tc, "descr", "Test poll(2) timing"); 225 atf_tc_set_md_var(tc, "timeout", "65"); 226 } 227 228 ATF_TC_BODY(poll, tc) 229 { 230 231 sleeptest(do_poll, true, true); 232 } 233 234 ATF_TC(sleep); 235 ATF_TC_HEAD(sleep, tc) 236 { 237 238 atf_tc_set_md_var(tc, "descr", "Test sleep(3) timing"); 239 atf_tc_set_md_var(tc, "timeout", "65"); 240 } 241 242 ATF_TC_BODY(sleep, tc) 243 { 244 245 sleeptest(do_sleep, false, false); 246 } 247 248 ATF_TC(kevent); 249 ATF_TC_HEAD(kevent, tc) 250 { 251 252 atf_tc_set_md_var(tc, "descr", "Test kevent(2) timing"); 253 atf_tc_set_md_var(tc, "timeout", "65"); 254 } 255 256 ATF_TC_BODY(kevent, tc) 257 { 258 259 sleeptest(do_kevent, true, true); 260 } 261 262 int 263 sleeptest(int (*test)(struct timespec *, struct timespec *), 264 bool subsec, bool sim_remain) 265 { 266 struct timespec tsa, tsb, tslp, tremain; 267 int64_t delta1, delta2, delta3, round; 268 269 sig = 0; 270 signal(SIGALRM, sigalrm); 271 272 if (subsec) { 273 round = 1; 274 delta3 = FUZZ; 275 } else { 276 round = 1000000000; 277 delta3 = round; 278 } 279 fprintf(stderr, "round=%"PRId64" delta3=%"PRId64"\n", round, delta3); 280 281 tslp.tv_sec = delta3 / 1000000000; 282 tslp.tv_nsec = delta3 % 1000000000; 283 fprintf(stderr, "initial tslp = %lld.%09ld sec\n", 284 (long long)tslp.tv_sec, (long)tslp.tv_nsec); 285 286 while (tslp.tv_sec <= MAXSLEEP) { 287 fprintf(stderr, "\n"); 288 289 /* 290 * disturb sleep by signal on purpose 291 */ 292 if (tslp.tv_sec > ALARM && sig == 0) { 293 fprintf(stderr, "request alarm after %d sec\n", ALARM); 294 alarm(ALARM); 295 } 296 297 fprintf(stderr, "sleep for %lld.%09ld sec\n", 298 (long long)tslp.tv_sec, (long)tslp.tv_nsec); 299 300 clock_gettime(CLOCK_REALTIME, &tsa); 301 (*test)(&tslp, &tremain); 302 clock_gettime(CLOCK_REALTIME, &tsb); 303 304 fprintf(stderr, "slept from %lld.%09ld to %lld.%09ld\n", 305 (long long)tsa.tv_sec, (long)tsa.tv_nsec, 306 (long long)tsb.tv_sec, (long)tsb.tv_nsec); 307 308 if (sim_remain) { 309 timespecsub(&tsb, &tsa, &tremain); 310 fprintf(stderr, "slept %lld.%09ld sec\n", 311 (long long)tremain.tv_sec, (long)tremain.tv_nsec); 312 timespecsub(&tslp, &tremain, &tremain); 313 } 314 315 fprintf(stderr, "remaining %lld.%09ld sec\n", 316 (long long)tremain.tv_sec, (long)tremain.tv_nsec); 317 318 delta1 = (int64_t)tsb.tv_sec - (int64_t)tsa.tv_sec; 319 delta1 *= BILLION; 320 delta1 += (int64_t)tsb.tv_nsec - (int64_t)tsa.tv_nsec; 321 322 fprintf(stderr, "delta1=%"PRId64"\n", delta1); 323 324 delta2 = (int64_t)tremain.tv_sec * BILLION; 325 delta2 += (int64_t)tremain.tv_nsec; 326 327 fprintf(stderr, "delta2=%"PRId64"\n", delta2); 328 329 delta3 = (int64_t)tslp.tv_sec * BILLION; 330 delta3 += (int64_t)tslp.tv_nsec - delta1 - delta2; 331 332 fprintf(stderr, "delta3=%"PRId64"\n", delta3); 333 334 delta3 /= round; 335 delta3 *= round; 336 337 fprintf(stderr, " ->%"PRId64"\n", delta3); 338 339 if (delta3 > FUZZ || delta3 < -FUZZ) { 340 if (!sim_remain) 341 atf_tc_expect_fail("Long reschedule latency " 342 "due to PR kern/43997"); 343 344 atf_tc_fail("Reschedule latency %"PRId64" exceeds " 345 "allowable fuzz %lld", delta3, FUZZ); 346 } 347 delta3 = (int64_t)tslp.tv_sec * 2 * BILLION; 348 delta3 += (int64_t)tslp.tv_nsec * 2; 349 350 fprintf(stderr, "delta3=%"PRId64"\n", delta3); 351 352 delta3 /= round; 353 delta3 *= round; 354 fprintf(stderr, " ->%"PRId64"\n", delta3); 355 if (delta3 < FUZZ) 356 break; 357 tslp.tv_sec = delta3 / BILLION; 358 tslp.tv_nsec = delta3 % BILLION; 359 fprintf(stderr, "tslp = %lld.%ld sec\n", 360 (long long)tslp.tv_sec, (long)tslp.tv_nsec); 361 } 362 ATF_REQUIRE_MSG(sig == 1, "Alarm did not fire!"); 363 364 atf_tc_pass(); 365 } 366 367 ATF_TP_ADD_TCS(tp) 368 { 369 ATF_TP_ADD_TC(tp, nanosleep); 370 ATF_TP_ADD_TC(tp, select); 371 ATF_TP_ADD_TC(tp, poll); 372 ATF_TP_ADD_TC(tp, sleep); 373 ATF_TP_ADD_TC(tp, kevent); 374 375 return atf_no_error(); 376 } 377
Indexes created Wed Sep 24 05:09:52 GMT 2025