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.
30 /* kqueue(2) on FreeBSD requires sys/types.h for uintptr_t; NetBSD doesn't. */
31 #include <sys/types.h>
33 #include <sys/cdefs.h>
34 #include <sys/event.h>
35 #include <sys/signal.h>
36 #include <sys/time.h> /* for TIMESPEC_TO_TIMEVAL on FreeBSD */
50 #define BILLION 1000000000LL /* nano-seconds per second */
51 #define MILLION 1000000LL /* nano-seconds per milli-second */
53 #define ALARM 6 /* SIGALRM after this many seconds */
54 #define MAXSLEEP 22 /* Maximum delay in seconds */
55 #define KEVNT_TIMEOUT 10300 /* measured in milli-seconds */
56 #define FUZZ (40 * MILLION) /* scheduling fuzz accepted - 40 ms */
61 * Most tests use FUZZ as their initial delay value, but 'sleep'
62 * starts at 1sec (since it cannot handle sub-second intervals).
63 * Subsequent passes double the previous interval, up to MAXSLEEP.
65 * The current values result in 5 passes for the 'sleep' test (at 1,
66 * 2, 4, 8, and 16 seconds) and 10 passes for the other tests (at
67 * 0.04, 0.08, 0.16, 0.32, 0.64, 1.28, 2.56, 5.12, 10.24, and 20.48
70 * The ALARM is only set if the current pass's delay is longer, and
71 * only if the ALARM has not already been triggered.
73 * The 'kevent' test needs the ALARM to be set on a different pass
74 * from when the KEVNT_TIMEOUT fires. So set ALARM to fire on the
75 * penultimate pass, and the KEVNT_TIMEOUT on the final pass. We
76 * set KEVNT_TIMEOUT just barely long enough to put it into the
77 * last test pass, and set MAXSLEEP a couple seconds longer than
78 * necessary, in order to avoid a QEMU bug which nearly doubles
82 static volatile int sig;
84 int sleeptest(int (*)(struct timespec *, struct timespec *), bool, bool);
85 int do_nanosleep(struct timespec *, struct timespec *);
86 int do_select(struct timespec *, struct timespec *);
88 int do_poll(struct timespec *, struct timespec *);
90 int do_sleep(struct timespec *, struct timespec *);
91 int do_kevent(struct timespec *, struct timespec *);
102 do_nanosleep(struct timespec *delay, struct timespec *remain)
106 if (nanosleep(delay, remain) == -1)
107 ret = (errno == EINTR ? 0 : errno);
114 do_select(struct timespec *delay, struct timespec *remain)
119 TIMESPEC_TO_TIMEVAL(&tv, delay);
120 if (select(0, NULL, NULL, NULL, &tv) == -1)
121 ret = (errno == EINTR ? 0 : errno);
129 do_poll(struct timespec *delay, struct timespec *remain)
134 TIMESPEC_TO_TIMEVAL(&tv, delay);
135 if (pollts(NULL, 0, delay, NULL) == -1)
136 ret = (errno == EINTR ? 0 : errno);
144 do_sleep(struct timespec *delay, struct timespec *remain)
148 TIMESPEC_TO_TIMEVAL(&tv, delay);
149 remain->tv_sec = sleep(delay->tv_sec);
156 do_kevent(struct timespec *delay, struct timespec *remain)
158 struct kevent ktimer;
159 struct kevent kresult;
163 ATF_REQUIRE_MSG((kq = kqueue()) != -1, "kqueue: %s", strerror(errno));
168 * If we expect the KEVNT_TIMEOUT to fire, and we're running
169 * under QEMU, make sure the delay is long enough to account
170 * for the effects of PR kern/43997 !
173 tmo/1000 < delay->tv_sec && tmo/500 > delay->tv_sec)
174 delay->tv_sec = MAXSLEEP;
176 EV_SET(&ktimer, 1, EVFILT_TIMER, EV_ADD, 0, tmo, 0);
178 rtc = kevent(kq, &ktimer, 1, &kresult, 1, delay);
184 ATF_REQUIRE_MSG(kerrno == EINTR, "kevent: %s",
189 if (delay->tv_sec * BILLION + delay->tv_nsec > tmo * MILLION)
190 ATF_REQUIRE_MSG(rtc > 0,
191 "kevent: KEVNT_TIMEOUT did not cause EVFILT_TIMER event");
197 ATF_TC_HEAD(nanosleep, tc)
200 atf_tc_set_md_var(tc, "descr", "Test nanosleep(2) timing");
201 atf_tc_set_md_var(tc, "timeout", "65");
204 ATF_TC_BODY(nanosleep, tc)
207 sleeptest(do_nanosleep, true, false);
211 ATF_TC_HEAD(select, tc)
214 atf_tc_set_md_var(tc, "descr", "Test select(2) timing");
215 atf_tc_set_md_var(tc, "timeout", "65");
218 ATF_TC_BODY(select, tc)
221 sleeptest(do_select, true, true);
226 ATF_TC_HEAD(poll, tc)
229 atf_tc_set_md_var(tc, "descr", "Test poll(2) timing");
230 atf_tc_set_md_var(tc, "timeout", "65");
233 ATF_TC_BODY(poll, tc)
236 sleeptest(do_poll, true, true);
241 ATF_TC_HEAD(sleep, tc)
244 atf_tc_set_md_var(tc, "descr", "Test sleep(3) timing");
245 atf_tc_set_md_var(tc, "timeout", "65");
248 ATF_TC_BODY(sleep, tc)
251 sleeptest(do_sleep, false, false);
255 ATF_TC_HEAD(kevent, tc)
258 atf_tc_set_md_var(tc, "descr", "Test kevent(2) timing");
259 atf_tc_set_md_var(tc, "timeout", "65");
262 ATF_TC_BODY(kevent, tc)
265 sleeptest(do_kevent, true, true);
269 sleeptest(int (*test)(struct timespec *, struct timespec *),
270 bool subsec, bool sim_remain)
272 struct timespec tsa, tsb, tslp, tremain;
273 int64_t delta1, delta2, delta3, round;
276 signal(SIGALRM, sigalrm);
286 tslp.tv_sec = delta3 / 1000000000;
287 tslp.tv_nsec = delta3 % 1000000000;
289 while (tslp.tv_sec <= MAXSLEEP) {
291 * disturb sleep by signal on purpose
293 if (tslp.tv_sec > ALARM && sig == 0)
296 clock_gettime(CLOCK_REALTIME, &tsa);
297 (*test)(&tslp, &tremain);
298 clock_gettime(CLOCK_REALTIME, &tsb);
301 timespecsub(&tsb, &tsa, &tremain);
302 timespecsub(&tslp, &tremain, &tremain);
305 delta1 = (int64_t)tsb.tv_sec - (int64_t)tsa.tv_sec;
307 delta1 += (int64_t)tsb.tv_nsec - (int64_t)tsa.tv_nsec;
309 delta2 = (int64_t)tremain.tv_sec * BILLION;
310 delta2 += (int64_t)tremain.tv_nsec;
312 delta3 = (int64_t)tslp.tv_sec * BILLION;
313 delta3 += (int64_t)tslp.tv_nsec - delta1 - delta2;
318 if (delta3 > FUZZ || delta3 < -FUZZ) {
320 atf_tc_expect_fail("Long reschedule latency "
321 "due to PR kern/43997");
323 atf_tc_fail("Reschedule latency %"PRId64" exceeds "
324 "allowable fuzz %lld", delta3, FUZZ);
326 delta3 = (int64_t)tslp.tv_sec * 2 * BILLION;
327 delta3 += (int64_t)tslp.tv_nsec * 2;
333 tslp.tv_sec = delta3 / BILLION;
334 tslp.tv_nsec = delta3 % BILLION;
336 ATF_REQUIRE_MSG(sig == 1, "Alarm did not fire!");
343 ATF_TP_ADD_TC(tp, nanosleep);
344 ATF_TP_ADD_TC(tp, select);
346 ATF_TP_ADD_TC(tp, poll);
348 ATF_TP_ADD_TC(tp, sleep);
349 ATF_TP_ADD_TC(tp, kevent);
351 return atf_no_error();