t_sleep.c revision 1.8
1 /* $NetBSD: t_sleep.c,v 1.8 2014/07/15 14:56:34 gson 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 <atf-c.h> 30 #include <errno.h> 31 #include <poll.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <time.h> 36 #include <unistd.h> 37 38 #include <sys/cdefs.h> 39 #include <sys/event.h> 40 #include <sys/signal.h> 41 42 #include "isqemu.h" 43 44 #define BILLION 1000000000LL /* nano-seconds per second */ 45 #define MILLION 1000000LL /* nano-seconds per milli-second */ 46 47 #define ALARM 6 /* SIGALRM after this many seconds */ 48 #define MAXSLEEP 22 /* Maximum delay in seconds */ 49 #define KEVNT_TIMEOUT 10300 /* measured in milli-seconds */ 50 #define FUZZ (40 * MILLION) /* scheduling fuzz accepted - 40 ms */ 51 52 /* 53 * Timer notes 54 * 55 * Most tests use FUZZ as their initial delay value, but 'sleep' 56 * starts at 1sec (since it cannot handle sub-second intervals). 57 * Subsequent passes double the previous interval, up to MAXSLEEP. 58 * 59 * The current values result in 5 passes for the 'sleep' test (at 1, 60 * 2, 4, 8, and 16 seconds) and 10 passes for the other tests (at 61 * 0.04, 0.08, 0.16, 0.32, 0.64, 1.28, 2.56, 5.12, 10.24, and 20.48 62 * seconds). 63 * 64 * The ALARM is only set if the current pass's delay is longer, and 65 * only if the ALARM has not already been triggered. 66 * 67 * The 'kevent' test needs the ALARM to be set on a different pass 68 * from when the KEVNT_TIMEOUT fires. So set ALARM to fire on the 69 * penultimate pass, and the KEVNT_TIMEOUT on the final pass. We 70 * set KEVNT_TIMEOUT just barely long enough to put it into the 71 * last test pass, and set MAXSLEEP a couple seconds longer than 72 * necessary, in order to avoid a QEMU bug which nearly doubles 73 * some timers. 74 */ 75 76 static volatile int sig; 77 78 int sleeptest(int (*)(struct timespec *, struct timespec *), bool, bool); 79 int do_nanosleep(struct timespec *, struct timespec *); 80 int do_select(struct timespec *, struct timespec *); 81 int do_poll(struct timespec *, struct timespec *); 82 int do_sleep(struct timespec *, struct timespec *); 83 int do_kevent(struct timespec *, struct timespec *); 84 void sigalrm(int); 85 86 void 87 sigalrm(int s) 88 { 89 90 sig++; 91 } 92 93 int 94 do_nanosleep(struct timespec *delay, struct timespec *remain) 95 { 96 int ret; 97 98 if (nanosleep(delay, remain) == -1) 99 ret = (errno == EINTR ? 0 : errno); 100 else 101 ret = 0; 102 return ret; 103 } 104 105 int 106 do_select(struct timespec *delay, struct timespec *remain) 107 { 108 int ret; 109 struct timeval tv; 110 111 TIMESPEC_TO_TIMEVAL(&tv, delay); 112 if (select(0, NULL, NULL, NULL, &tv) == -1) 113 ret = (errno == EINTR ? 0 : errno); 114 else 115 ret = 0; 116 return ret; 117 } 118 119 int 120 do_poll(struct timespec *delay, struct timespec *remain) 121 { 122 int ret; 123 struct timeval tv; 124 125 TIMESPEC_TO_TIMEVAL(&tv, delay); 126 if (pollts(NULL, 0, delay, NULL) == -1) 127 ret = (errno == EINTR ? 0 : errno); 128 else 129 ret = 0; 130 return ret; 131 } 132 133 int 134 do_sleep(struct timespec *delay, struct timespec *remain) 135 { 136 struct timeval tv; 137 138 TIMESPEC_TO_TIMEVAL(&tv, delay); 139 remain->tv_sec = sleep(delay->tv_sec); 140 remain->tv_nsec = 0; 141 142 return 0; 143 } 144 145 int 146 do_kevent(struct timespec *delay, struct timespec *remain) 147 { 148 struct kevent ktimer; 149 struct kevent kresult; 150 int rtc, kq, kerrno; 151 int tmo; 152 153 ATF_REQUIRE_MSG((kq = kqueue()) != -1, "kqueue: %s", strerror(errno)); 154 155 tmo = KEVNT_TIMEOUT; 156 157 /* 158 * If we expect the KEVNT_TIMEOUT to fire, and we're running 159 * under QEMU, make sure the delay is long enough to account 160 * for the effects of PR kern/43997 ! 161 */ 162 if (isQEMU() && 163 tmo/1000 < delay->tv_sec && tmo/500 > delay->tv_sec) 164 delay->tv_sec = MAXSLEEP; 165 166 EV_SET(&ktimer, 1, EVFILT_TIMER, EV_ADD, 0, tmo, 0); 167 168 rtc = kevent(kq, &ktimer, 1, &kresult, 1, delay); 169 kerrno = errno; 170 171 (void)close(kq); 172 173 if (rtc == -1) { 174 ATF_REQUIRE_MSG(kerrno == EINTR, "kevent: %s", strerror(errno)); 175 return 0; 176 } 177 178 if (delay->tv_sec * BILLION + delay->tv_nsec > tmo * MILLION) 179 ATF_REQUIRE_MSG(rtc > 0, 180 "kevent: KEVNT_TIMEOUT did not cause EVFILT_TIMER event"); 181 182 return 0; 183 } 184 185 ATF_TC(nanosleep); 186 ATF_TC_HEAD(nanosleep, tc) 187 { 188 189 atf_tc_set_md_var(tc, "descr", "Test nanosleep(2) timing"); 190 atf_tc_set_md_var(tc, "timeout", "65"); 191 } 192 193 ATF_TC_BODY(nanosleep, tc) 194 { 195 196 sleeptest(do_nanosleep, true, false); 197 } 198 199 ATF_TC(select); 200 ATF_TC_HEAD(select, tc) 201 { 202 203 atf_tc_set_md_var(tc, "descr", "Test select(2) timing"); 204 atf_tc_set_md_var(tc, "timeout", "65"); 205 } 206 207 ATF_TC_BODY(select, tc) 208 { 209 210 sleeptest(do_select, true, true); 211 } 212 213 ATF_TC(poll); 214 ATF_TC_HEAD(poll, tc) 215 { 216 217 atf_tc_set_md_var(tc, "descr", "Test poll(2) timing"); 218 atf_tc_set_md_var(tc, "timeout", "65"); 219 } 220 221 ATF_TC_BODY(poll, tc) 222 { 223 224 sleeptest(do_poll, true, true); 225 } 226 227 ATF_TC(sleep); 228 ATF_TC_HEAD(sleep, tc) 229 { 230 231 atf_tc_set_md_var(tc, "descr", "Test sleep(3) timing"); 232 atf_tc_set_md_var(tc, "timeout", "65"); 233 } 234 235 ATF_TC_BODY(sleep, tc) 236 { 237 238 sleeptest(do_sleep, false, false); 239 } 240 241 ATF_TC(kevent); 242 ATF_TC_HEAD(kevent, tc) 243 { 244 245 atf_tc_set_md_var(tc, "descr", "Test kevent(2) timing"); 246 atf_tc_set_md_var(tc, "timeout", "65"); 247 } 248 249 ATF_TC_BODY(kevent, tc) 250 { 251 252 sleeptest(do_kevent, true, true); 253 } 254 255 int 256 sleeptest(int (*test)(struct timespec *, struct timespec *), 257 bool subsec, bool sim_remain) 258 { 259 struct timespec tsa, tsb, tslp, tremain; 260 int64_t delta1, delta2, delta3, round; 261 262 sig = 0; 263 signal(SIGALRM, sigalrm); 264 265 if (subsec) { 266 round = 1; 267 delta3 = FUZZ; 268 } else { 269 round = 1000000000; 270 delta3 = round; 271 } 272 273 tslp.tv_sec = delta3 / 1000000000; 274 tslp.tv_nsec = delta3 % 1000000000; 275 276 while (tslp.tv_sec <= MAXSLEEP) { 277 /* 278 * disturb sleep by signal on purpose 279 */ 280 if (tslp.tv_sec > ALARM && sig == 0) 281 alarm(ALARM); 282 283 clock_gettime(CLOCK_REALTIME, &tsa); 284 (*test)(&tslp, &tremain); 285 clock_gettime(CLOCK_REALTIME, &tsb); 286 287 if (sim_remain) { 288 timespecsub(&tsb, &tsa, &tremain); 289 timespecsub(&tslp, &tremain, &tremain); 290 } 291 292 delta1 = (int64_t)tsb.tv_sec - (int64_t)tsa.tv_sec; 293 delta1 *= BILLION; 294 delta1 += (int64_t)tsb.tv_nsec - (int64_t)tsa.tv_nsec; 295 296 delta2 = (int64_t)tremain.tv_sec * BILLION; 297 delta2 += (int64_t)tremain.tv_nsec; 298 299 delta3 = (int64_t)tslp.tv_sec * BILLION; 300 delta3 += (int64_t)tslp.tv_nsec - delta1 - delta2; 301 302 delta3 /= round; 303 delta3 *= round; 304 305 if (delta3 > FUZZ || delta3 < -FUZZ) { 306 if (!sim_remain) 307 atf_tc_expect_fail("Long reschedule latency " 308 "due to PR kern/43997"); 309 310 atf_tc_fail("Reschedule latency %"PRId64" exceeds " 311 "allowable fuzz %lld", delta3, FUZZ); 312 } 313 delta3 = (int64_t)tslp.tv_sec * 2 * BILLION; 314 delta3 += (int64_t)tslp.tv_nsec * 2; 315 316 delta3 /= round; 317 delta3 *= round; 318 if (delta3 < FUZZ) 319 break; 320 tslp.tv_sec = delta3 / BILLION; 321 tslp.tv_nsec = delta3 % BILLION; 322 } 323 ATF_REQUIRE_MSG(sig == 1, "Alarm did not fire!"); 324 325 atf_tc_pass(); 326 } 327 328 ATF_TP_ADD_TCS(tp) 329 { 330 ATF_TP_ADD_TC(tp, nanosleep); 331 ATF_TP_ADD_TC(tp, select); 332 ATF_TP_ADD_TC(tp, poll); 333 ATF_TP_ADD_TC(tp, sleep); 334 ATF_TP_ADD_TC(tp, kevent); 335 336 return atf_no_error(); 337 } 338
Indexes created Wed Sep 24 15:09:51 GMT 2025