1 /* $NetBSD: t_sleep.c,v 1.8 2014/07/15 14:56:34 gson Exp $ */
4 * Copyright (c) 2006 Frank Kardel
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
38 #include <sys/cdefs.h>
39 #include <sys/event.h>
40 #include <sys/signal.h>
44 #define BILLION 1000000000LL /* nano-seconds per second */
45 #define MILLION 1000000LL /* nano-seconds per milli-second */
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 */
60 * Most tests use FUZZ as their initial delay value, but 'sleep'
61 * starts at 1sec (since it cannot handle sub-second intervals).
62 * Subsequent passes double the previous interval, up to MAXSLEEP.
64 * The current values result in 5 passes for the 'sleep' test (at 1,
65 * 2, 4, 8, and 16 seconds) and 10 passes for the other tests (at
66 * 0.04, 0.08, 0.16, 0.32, 0.64, 1.28, 2.56, 5.12, 10.24, and 20.48
69 * The ALARM is only set if the current pass's delay is longer, and
70 * only if the ALARM has not already been triggered.
72 * The 'kevent' test needs the ALARM to be set on a different pass
73 * from when the KEVNT_TIMEOUT fires. So set ALARM to fire on the
74 * penultimate pass, and the KEVNT_TIMEOUT on the final pass. We
75 * set KEVNT_TIMEOUT just barely long enough to put it into the
76 * last test pass, and set MAXSLEEP a couple seconds longer than
77 * necessary, in order to avoid a QEMU bug which nearly doubles
81 static volatile int sig;
83 int sleeptest(int (*)(struct timespec *, struct timespec *), bool, bool);
84 int do_nanosleep(struct timespec *, struct timespec *);
85 int do_select(struct timespec *, struct timespec *);
87 int do_poll(struct timespec *, struct timespec *);
89 int do_sleep(struct timespec *, struct timespec *);
90 int do_kevent(struct timespec *, struct timespec *);
101 do_nanosleep(struct timespec *delay, struct timespec *remain)
105 if (nanosleep(delay, remain) == -1)
106 ret = (errno == EINTR ? 0 : errno);
113 do_select(struct timespec *delay, struct timespec *remain)
118 TIMESPEC_TO_TIMEVAL(&tv, delay);
119 if (select(0, NULL, NULL, NULL, &tv) == -1)
120 ret = (errno == EINTR ? 0 : errno);
128 do_poll(struct timespec *delay, struct timespec *remain)
133 TIMESPEC_TO_TIMEVAL(&tv, delay);
134 if (pollts(NULL, 0, delay, NULL) == -1)
135 ret = (errno == EINTR ? 0 : errno);
143 do_sleep(struct timespec *delay, struct timespec *remain)
147 TIMESPEC_TO_TIMEVAL(&tv, delay);
148 remain->tv_sec = sleep(delay->tv_sec);
155 do_kevent(struct timespec *delay, struct timespec *remain)
157 struct kevent ktimer;
158 struct kevent kresult;
162 ATF_REQUIRE_MSG((kq = kqueue()) != -1, "kqueue: %s", strerror(errno));
167 * If we expect the KEVNT_TIMEOUT to fire, and we're running
168 * under QEMU, make sure the delay is long enough to account
169 * for the effects of PR kern/43997 !
172 tmo/1000 < delay->tv_sec && tmo/500 > delay->tv_sec)
173 delay->tv_sec = MAXSLEEP;
175 EV_SET(&ktimer, 1, EVFILT_TIMER, EV_ADD, 0, tmo, 0);
177 rtc = kevent(kq, &ktimer, 1, &kresult, 1, delay);
183 ATF_REQUIRE_MSG(kerrno == EINTR, "kevent: %s", strerror(errno));
187 if (delay->tv_sec * BILLION + delay->tv_nsec > tmo * MILLION)
188 ATF_REQUIRE_MSG(rtc > 0,
189 "kevent: KEVNT_TIMEOUT did not cause EVFILT_TIMER event");
195 ATF_TC_HEAD(nanosleep, tc)
198 atf_tc_set_md_var(tc, "descr", "Test nanosleep(2) timing");
199 atf_tc_set_md_var(tc, "timeout", "65");
202 ATF_TC_BODY(nanosleep, tc)
205 sleeptest(do_nanosleep, true, false);
209 ATF_TC_HEAD(select, tc)
212 atf_tc_set_md_var(tc, "descr", "Test select(2) timing");
213 atf_tc_set_md_var(tc, "timeout", "65");
216 ATF_TC_BODY(select, tc)
219 sleeptest(do_select, true, true);
224 ATF_TC_HEAD(poll, tc)
227 atf_tc_set_md_var(tc, "descr", "Test poll(2) timing");
228 atf_tc_set_md_var(tc, "timeout", "65");
231 ATF_TC_BODY(poll, tc)
234 sleeptest(do_poll, true, true);
239 ATF_TC_HEAD(sleep, tc)
242 atf_tc_set_md_var(tc, "descr", "Test sleep(3) timing");
243 atf_tc_set_md_var(tc, "timeout", "65");
246 ATF_TC_BODY(sleep, tc)
249 sleeptest(do_sleep, false, false);
253 ATF_TC_HEAD(kevent, tc)
256 atf_tc_set_md_var(tc, "descr", "Test kevent(2) timing");
257 atf_tc_set_md_var(tc, "timeout", "65");
260 ATF_TC_BODY(kevent, tc)
263 sleeptest(do_kevent, true, true);
267 sleeptest(int (*test)(struct timespec *, struct timespec *),
268 bool subsec, bool sim_remain)
270 struct timespec tsa, tsb, tslp, tremain;
271 int64_t delta1, delta2, delta3, round;
274 signal(SIGALRM, sigalrm);
284 tslp.tv_sec = delta3 / 1000000000;
285 tslp.tv_nsec = delta3 % 1000000000;
287 while (tslp.tv_sec <= MAXSLEEP) {
289 * disturb sleep by signal on purpose
291 if (tslp.tv_sec > ALARM && sig == 0)
294 clock_gettime(CLOCK_REALTIME, &tsa);
295 (*test)(&tslp, &tremain);
296 clock_gettime(CLOCK_REALTIME, &tsb);
299 timespecsub(&tsb, &tsa, &tremain);
300 timespecsub(&tslp, &tremain, &tremain);
303 delta1 = (int64_t)tsb.tv_sec - (int64_t)tsa.tv_sec;
305 delta1 += (int64_t)tsb.tv_nsec - (int64_t)tsa.tv_nsec;
307 delta2 = (int64_t)tremain.tv_sec * BILLION;
308 delta2 += (int64_t)tremain.tv_nsec;
310 delta3 = (int64_t)tslp.tv_sec * BILLION;
311 delta3 += (int64_t)tslp.tv_nsec - delta1 - delta2;
316 if (delta3 > FUZZ || delta3 < -FUZZ) {
318 atf_tc_expect_fail("Long reschedule latency "
319 "due to PR kern/43997");
321 atf_tc_fail("Reschedule latency %"PRId64" exceeds "
322 "allowable fuzz %lld", delta3, FUZZ);
324 delta3 = (int64_t)tslp.tv_sec * 2 * BILLION;
325 delta3 += (int64_t)tslp.tv_nsec * 2;
331 tslp.tv_sec = delta3 / BILLION;
332 tslp.tv_nsec = delta3 % BILLION;
334 ATF_REQUIRE_MSG(sig == 1, "Alarm did not fire!");
341 ATF_TP_ADD_TC(tp, nanosleep);
342 ATF_TP_ADD_TC(tp, select);
344 ATF_TP_ADD_TC(tp, poll);
346 ATF_TP_ADD_TC(tp, sleep);
347 ATF_TP_ADD_TC(tp, kevent);
349 return atf_no_error();