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t_sleep.c revision 1.3 
      1 /* $NetBSD: t_sleep.c,v 1.3 2012/11/08 16:33:26 pgoyette 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 <err.h>
     31 #include <errno.h>
     32 #include <poll.h>
     33 #include <stdio.h>
     34 #include <stdlib.h>
     35 #include <string.h>
     36 #include <time.h>
     37 #include <unistd.h>
     38 
     39 #include <sys/cdefs.h>
     40 #include <sys/event.h>
     41 #include <sys/signal.h>
     42 
     43 #define ALARM		11		/* SIGALRM after this many seconds */
     44 #define KEVNT_TIMEOUT	13200		/* measured in milli-seconds */
     45 #define BILLION		1000000000LL	/* nano-seconds per second */
     46 #define MILLION		1000000LL	/* nano-seconds per milli-second */
     47 #define FUZZ		(50 * MILLION)	/* scheduling fuzz accepted - 50 ms */
     48 #define MAXSLEEP	(32 * BILLION)	/* 32 seconds */
     49 
     50 static volatile int sig, sigs;
     51 
     52 int sleeptest(int (*)(struct timespec *, struct timespec *), bool, bool);
     53 int do_nanosleep(struct timespec *, struct timespec *);
     54 int do_select(struct timespec *, struct timespec *);
     55 int do_poll(struct timespec *, struct timespec *);
     56 int do_sleep(struct timespec *, struct timespec *);
     57 int do_kevent(struct timespec *, struct timespec *);
     58 void sigalrm(int);
     59 
     60 void
     61 sigalrm(int s)
     62 {
     63 	sig++;
     64 }
     65 
     66 int
     67 do_nanosleep(struct timespec *delay, struct timespec *remain)
     68 {
     69 	int ret;
     70 
     71 	if (nanosleep(delay, remain) == -1)
     72 		ret = (errno == EINTR ? 0 : errno);
     73 	else
     74 		ret = 0;
     75 	return ret;
     76 }
     77 
     78 int
     79 do_select(struct timespec *delay, struct timespec *remain)
     80 {
     81 	int ret;
     82 	struct timeval tv;
     83 
     84 	TIMESPEC_TO_TIMEVAL(&tv, delay);
     85 	if (select(0, NULL, NULL, NULL, &tv) == -1)
     86 		ret = (errno == EINTR ? 0 : errno);
     87 	else
     88 		ret = 0;
     89 	return ret;
     90 }
     91 
     92 int
     93 do_poll(struct timespec *delay, struct timespec *remain)
     94 {
     95 	int ret;
     96 	struct timeval tv;
     97 
     98 	TIMESPEC_TO_TIMEVAL(&tv, delay);
     99 	if (pollts(NULL, 0, delay, NULL) == -1)
    100 		ret = (errno == EINTR ? 0 : errno);
    101 	else
    102 		ret = 0;
    103 	return ret;
    104 }
    105 
    106 int
    107 do_sleep(struct timespec *delay, struct timespec *remain)
    108 {
    109 	struct timeval tv;
    110 
    111 	TIMESPEC_TO_TIMEVAL(&tv, delay);
    112 	remain->tv_sec = sleep(delay->tv_sec);
    113 	remain->tv_nsec = 0;
    114 
    115 	return 0;
    116 }
    117 
    118 int
    119 do_kevent(struct timespec *delay, struct timespec *remain)
    120 {
    121 	struct kevent ktimer;
    122 	struct kevent kresult;
    123 	int rtc, kq, kerrno;
    124 	int tmo = KEVNT_TIMEOUT;
    125 
    126 	ATF_REQUIRE_MSG((kq = kqueue()) != -1, "kqueue: %s", strerror(errno));
    127 
    128 	EV_SET(&ktimer, 1, EVFILT_TIMER, EV_ADD, 0, tmo, 0);
    129 
    130 	rtc = kevent(kq, &ktimer, 1, &kresult, 1, delay);
    131 	kerrno = errno;
    132 
    133 	(void)close(kq);
    134 
    135 	ATF_REQUIRE_MSG(rtc != -1 || kerrno == EINTR, "kevent: %s",
    136 	    strerror(errno));
    137 
    138 	if (delay->tv_sec * BILLION + delay->tv_nsec > tmo * MILLION)
    139 		ATF_REQUIRE_MSG(rtc > 0,
    140 		    "kevent: ALARM did not cause EVFILT_TIMER event");
    141 
    142 	return 0;
    143 }
    144 
    145 ATF_TC(nanosleep);
    146 ATF_TC_HEAD(nanosleep, tc)
    147 {
    148 
    149 	atf_tc_set_md_var(tc, "descr", "Test nanosleep(2) timing");
    150 	atf_tc_set_md_var(tc, "timeout", "65");
    151 }
    152 
    153 ATF_TC_BODY(nanosleep, tc)
    154 {
    155 
    156 	sleeptest(do_nanosleep, true, false);
    157 }
    158 
    159 ATF_TC(select);
    160 ATF_TC_HEAD(select, tc)
    161 {
    162 
    163 	atf_tc_set_md_var(tc, "descr", "Test select(2) timing");
    164 	atf_tc_set_md_var(tc, "timeout", "65");
    165 }
    166 
    167 ATF_TC_BODY(select, tc)
    168 {
    169 
    170 	sleeptest(do_select, true, true);
    171 }
    172 
    173 ATF_TC(poll);
    174 ATF_TC_HEAD(poll, tc)
    175 {
    176 
    177 	atf_tc_set_md_var(tc, "descr", "Test poll(2) timing");
    178 	atf_tc_set_md_var(tc, "timeout", "65");
    179 }
    180 
    181 ATF_TC_BODY(poll, tc)
    182 {
    183 
    184 	sleeptest(do_poll, true, true);
    185 }
    186 
    187 ATF_TC(sleep);
    188 ATF_TC_HEAD(sleep, tc)
    189 {
    190 
    191 	atf_tc_set_md_var(tc, "descr", "Test sleep(3) timing");
    192 	atf_tc_set_md_var(tc, "timeout", "65");
    193 }
    194 
    195 ATF_TC_BODY(sleep, tc)
    196 {
    197 
    198 	sleeptest(do_sleep, false, false);
    199 }
    200 
    201 ATF_TC(kevent);
    202 ATF_TC_HEAD(kevent, tc)
    203 {
    204 
    205 	atf_tc_set_md_var(tc, "descr", "Test kevent(2) timing");
    206 	atf_tc_set_md_var(tc, "timeout", "65");
    207 }
    208 
    209 ATF_TC_BODY(kevent, tc)
    210 {
    211 
    212 	sleeptest(do_kevent, true, true);
    213 }
    214 
    215 int
    216 sleeptest(int (*test)(struct timespec *, struct timespec *),
    217 	   bool subsec, bool sim_remain)
    218 {
    219 	struct timespec tsa, tsb, tslp, tremain;
    220 	int64_t delta1, delta2, delta3, round;
    221 
    222 	sig = 0;
    223 	signal(SIGALRM, sigalrm);
    224 
    225 	if (subsec) {
    226 		round = 1;
    227 		delta3 = FUZZ;
    228 	} else {
    229 		round = 1000000000;
    230 		delta3 = round;
    231 	}
    232 
    233 	tslp.tv_sec = delta3 / 1000000000;
    234 	tslp.tv_nsec = delta3 % 1000000000;
    235 
    236 	while (delta3 <= MAXSLEEP) {
    237 		/*
    238 		 * disturb sleep by signal on purpose
    239 		 */
    240 		if (delta3 > ALARM * BILLION && sig == 0)
    241 			alarm(ALARM);
    242 
    243 		clock_gettime(CLOCK_REALTIME, &tsa);
    244 		(*test)(&tslp, &tremain);
    245 		clock_gettime(CLOCK_REALTIME, &tsb);
    246 
    247 		if (sim_remain) {
    248 			timespecsub(&tsb, &tsa, &tremain);
    249 			timespecsub(&tslp, &tremain, &tremain);
    250 		}
    251 
    252 		delta1 = (int64_t)tsb.tv_sec - (int64_t)tsa.tv_sec;
    253 		delta1 *= BILLION;
    254 		delta1 += (int64_t)tsb.tv_nsec - (int64_t)tsa.tv_nsec;
    255 
    256 		delta2 = (int64_t)tremain.tv_sec * BILLION;
    257 		delta2 += (int64_t)tremain.tv_nsec;
    258 
    259 		delta3 = (int64_t)tslp.tv_sec * BILLION;
    260 		delta3 += (int64_t)tslp.tv_nsec - delta1 - delta2;
    261 
    262 		delta3 /= round;
    263 		delta3 *= round;
    264 
    265 		ATF_REQUIRE_MSG(delta3 <= FUZZ && delta3 >= -FUZZ,
    266 		    "Reschedule latency %"PRId64" exceeds allowable fuzz %lld",
    267 		    delta3, FUZZ);
    268 
    269 		delta3 = (int64_t)tslp.tv_sec * 2 * BILLION;
    270 		delta3 += (int64_t)tslp.tv_nsec * 2;
    271 
    272 		delta3 /= round;
    273 		delta3 *= round;
    274 		if (delta3 < FUZZ)
    275 			break;
    276 		tslp.tv_sec = delta3 / BILLION;
    277 		tslp.tv_nsec = delta3 % BILLION;
    278 	}
    279 	ATF_REQUIRE_MSG(sig == 1, "Alarm did not fire!");
    280 
    281 	atf_tc_pass();
    282 }
    283 
    284 ATF_TP_ADD_TCS(tp)
    285 {
    286 	ATF_TP_ADD_TC(tp, nanosleep);
    287 	ATF_TP_ADD_TC(tp, select);
    288 	ATF_TP_ADD_TC(tp, poll);
    289 	ATF_TP_ADD_TC(tp, sleep);
    290 	ATF_TP_ADD_TC(tp, kevent);
    291 
    292 	return atf_no_error();
    293 }
    294