2 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 #include "thr_private.h"
39 __weak_reference(__nanosleep, nanosleep);
42 _nanosleep(const struct timespec *time_to_sleep,
43 struct timespec *time_remaining)
45 struct pthread *curthread = _get_curthread();
47 struct timespec ts, ts1;
48 struct timespec remaining_time;
50 /* Check if the time to sleep is legal: */
51 if ((time_to_sleep == NULL) || (time_to_sleep->tv_sec < 0) ||
52 (time_to_sleep->tv_nsec < 0) ||
53 (time_to_sleep->tv_nsec >= 1000000000)) {
54 /* Return an EINVAL error : */
58 if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM)
59 return (__sys_nanosleep(time_to_sleep, time_remaining));
61 KSE_GET_TOD(curthread->kse, &ts);
63 /* Calculate the time for the current thread to wake up: */
64 TIMESPEC_ADD(&curthread->wakeup_time, &ts, time_to_sleep);
66 THR_LOCK_SWITCH(curthread);
67 curthread->interrupted = 0;
68 THR_SET_STATE(curthread, PS_SLEEP_WAIT);
70 /* Reschedule the current thread to sleep: */
71 _thr_sched_switch_unlocked(curthread);
73 /* Calculate the remaining time to sleep: */
74 KSE_GET_TOD(curthread->kse, &ts1);
75 remaining_time.tv_sec = time_to_sleep->tv_sec
76 + ts.tv_sec - ts1.tv_sec;
77 remaining_time.tv_nsec = time_to_sleep->tv_nsec
78 + ts.tv_nsec - ts1.tv_nsec;
80 /* Check if the nanosecond field has underflowed: */
81 if (remaining_time.tv_nsec < 0) {
82 /* Handle the underflow: */
83 remaining_time.tv_sec -= 1;
84 remaining_time.tv_nsec += 1000000000;
86 /* Check if the nanosecond field has overflowed: */
87 else if (remaining_time.tv_nsec >= 1000000000) {
88 /* Handle the overflow: */
89 remaining_time.tv_sec += 1;
90 remaining_time.tv_nsec -= 1000000000;
93 /* Check if the sleep was longer than the required time: */
94 if (remaining_time.tv_sec < 0) {
95 /* Reset the time left: */
96 remaining_time.tv_sec = 0;
97 remaining_time.tv_nsec = 0;
100 /* Check if the time remaining is to be returned: */
101 if (time_remaining != NULL) {
102 /* Return the actual time slept: */
103 time_remaining->tv_sec = remaining_time.tv_sec;
104 time_remaining->tv_nsec = remaining_time.tv_nsec;
107 /* Check if the sleep was interrupted: */
108 if (curthread->interrupted) {
109 /* Return an EINTR error : */
118 __nanosleep(const struct timespec *time_to_sleep,
119 struct timespec *time_remaining)
121 struct pthread *curthread = _get_curthread();
124 _thr_cancel_enter(curthread);
125 ret = _nanosleep(time_to_sleep, time_remaining);
126 _thr_cancel_leave(curthread, 1);