1 /* $NetBSD: t_sleep.c,v 1.11 2017/01/10 15:43:59 maya 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.
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 */
46 #define BILLION 1000000000LL /* nano-seconds per second */
47 #define MILLION 1000000LL /* nano-seconds per milli-second */
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 */
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.
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
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.
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
78 static volatile int sig;
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 *);
84 int do_poll(struct timespec *, struct timespec *);
86 int do_sleep(struct timespec *, struct timespec *);
87 int do_kevent(struct timespec *, struct timespec *);
98 do_nanosleep(struct timespec *delay, struct timespec *remain)
102 if (nanosleep(delay, remain) == -1)
103 ret = (errno == EINTR ? 0 : errno);
110 do_select(struct timespec *delay, struct timespec *remain)
115 TIMESPEC_TO_TIMEVAL(&tv, delay);
116 if (select(0, NULL, NULL, NULL, &tv) == -1)
117 ret = (errno == EINTR ? 0 : errno);
125 do_poll(struct timespec *delay, struct timespec *remain)
130 TIMESPEC_TO_TIMEVAL(&tv, delay);
131 if (pollts(NULL, 0, delay, NULL) == -1)
132 ret = (errno == EINTR ? 0 : errno);
140 do_sleep(struct timespec *delay, struct timespec *remain)
144 TIMESPEC_TO_TIMEVAL(&tv, delay);
145 remain->tv_sec = sleep(delay->tv_sec);
152 do_kevent(struct timespec *delay, struct timespec *remain)
154 struct kevent ktimer;
155 struct kevent kresult;
159 ATF_REQUIRE_MSG((kq = kqueue()) != -1, "kqueue: %s", strerror(errno));
164 * If we expect the KEVNT_TIMEOUT to fire, and we're running
165 * under QEMU, make sure the delay is long enough to account
166 * for the effects of PR kern/43997 !
169 tmo/1000 < delay->tv_sec && tmo/500 > delay->tv_sec)
170 delay->tv_sec = MAXSLEEP;
172 EV_SET(&ktimer, 1, EVFILT_TIMER, EV_ADD, 0, tmo, 0);
174 rtc = kevent(kq, &ktimer, 1, &kresult, 1, delay);
180 ATF_REQUIRE_MSG(kerrno == EINTR, "kevent: %s",
185 if (delay->tv_sec * BILLION + delay->tv_nsec > tmo * MILLION)
186 ATF_REQUIRE_MSG(rtc > 0,
187 "kevent: KEVNT_TIMEOUT did not cause EVFILT_TIMER event");
193 ATF_TC_HEAD(nanosleep, tc)
196 atf_tc_set_md_var(tc, "descr", "Test nanosleep(2) timing");
197 atf_tc_set_md_var(tc, "timeout", "65");
200 ATF_TC_BODY(nanosleep, tc)
203 sleeptest(do_nanosleep, true, false);
207 ATF_TC_HEAD(select, tc)
210 atf_tc_set_md_var(tc, "descr", "Test select(2) timing");
211 atf_tc_set_md_var(tc, "timeout", "65");
214 ATF_TC_BODY(select, tc)
217 sleeptest(do_select, true, true);
222 ATF_TC_HEAD(poll, tc)
225 atf_tc_set_md_var(tc, "descr", "Test poll(2) timing");
226 atf_tc_set_md_var(tc, "timeout", "65");
229 ATF_TC_BODY(poll, tc)
232 sleeptest(do_poll, true, true);
237 ATF_TC_HEAD(sleep, tc)
240 atf_tc_set_md_var(tc, "descr", "Test sleep(3) timing");
241 atf_tc_set_md_var(tc, "timeout", "65");
244 ATF_TC_BODY(sleep, tc)
247 sleeptest(do_sleep, false, false);
251 ATF_TC_HEAD(kevent, tc)
254 atf_tc_set_md_var(tc, "descr", "Test kevent(2) timing");
255 atf_tc_set_md_var(tc, "timeout", "65");
258 ATF_TC_BODY(kevent, tc)
261 sleeptest(do_kevent, true, true);
265 sleeptest(int (*test)(struct timespec *, struct timespec *),
266 bool subsec, bool sim_remain)
268 struct timespec tsa, tsb, tslp, tremain;
269 int64_t delta1, delta2, delta3, round;
272 signal(SIGALRM, sigalrm);
282 tslp.tv_sec = delta3 / 1000000000;
283 tslp.tv_nsec = delta3 % 1000000000;
285 while (tslp.tv_sec <= MAXSLEEP) {
287 * disturb sleep by signal on purpose
289 if (tslp.tv_sec > ALARM && sig == 0)
292 clock_gettime(CLOCK_REALTIME, &tsa);
293 (*test)(&tslp, &tremain);
294 clock_gettime(CLOCK_REALTIME, &tsb);
297 timespecsub(&tsb, &tsa, &tremain);
298 timespecsub(&tslp, &tremain, &tremain);
301 delta1 = (int64_t)tsb.tv_sec - (int64_t)tsa.tv_sec;
303 delta1 += (int64_t)tsb.tv_nsec - (int64_t)tsa.tv_nsec;
305 delta2 = (int64_t)tremain.tv_sec * BILLION;
306 delta2 += (int64_t)tremain.tv_nsec;
308 delta3 = (int64_t)tslp.tv_sec * BILLION;
309 delta3 += (int64_t)tslp.tv_nsec - delta1 - delta2;
314 if (delta3 > FUZZ || delta3 < -FUZZ) {
316 atf_tc_expect_fail("Long reschedule latency "
317 "due to PR kern/43997");
319 atf_tc_fail("Reschedule latency %"PRId64" exceeds "
320 "allowable fuzz %lld", delta3, FUZZ);
322 delta3 = (int64_t)tslp.tv_sec * 2 * BILLION;
323 delta3 += (int64_t)tslp.tv_nsec * 2;
329 tslp.tv_sec = delta3 / BILLION;
330 tslp.tv_nsec = delta3 % BILLION;
332 ATF_REQUIRE_MSG(sig == 1, "Alarm did not fire!");
339 ATF_TP_ADD_TC(tp, nanosleep);
340 ATF_TP_ADD_TC(tp, select);
342 ATF_TP_ADD_TC(tp, poll);
344 ATF_TP_ADD_TC(tp, sleep);
345 ATF_TP_ADD_TC(tp, kevent);
347 return atf_no_error();