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. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "pthread_private.h"
36 __weak_reference(__nanosleep, nanosleep);
39 _nanosleep(const struct timespec * time_to_sleep,
40 struct timespec * time_remaining)
42 struct pthread *curthread = _get_curthread();
44 struct timespec current_time;
45 struct timespec current_time1;
46 struct timespec remaining_time;
49 /* Check if the time to sleep is legal: */
50 if (time_to_sleep == NULL || time_to_sleep->tv_sec < 0 ||
51 time_to_sleep->tv_nsec < 0 || time_to_sleep->tv_nsec >= 1000000000) {
52 /* Return an EINVAL error : */
57 * As long as we're going to get the time of day, we
58 * might as well store it in the global time of day:
60 gettimeofday((struct timeval *) &_sched_tod, NULL);
62 TIMEVAL_TO_TIMESPEC(&tv, ¤t_time);
64 /* Calculate the time for the current thread to wake up: */
65 curthread->wakeup_time.tv_sec = current_time.tv_sec + time_to_sleep->tv_sec;
66 curthread->wakeup_time.tv_nsec = current_time.tv_nsec + time_to_sleep->tv_nsec;
68 /* Check if the nanosecond field has overflowed: */
69 if (curthread->wakeup_time.tv_nsec >= 1000000000) {
70 /* Wrap the nanosecond field: */
71 curthread->wakeup_time.tv_sec += 1;
72 curthread->wakeup_time.tv_nsec -= 1000000000;
74 curthread->interrupted = 0;
76 /* Reschedule the current thread to sleep: */
77 _thread_kern_sched_state(PS_SLEEP_WAIT, __FILE__, __LINE__);
80 * As long as we're going to get the time of day, we
81 * might as well store it in the global time of day:
83 gettimeofday((struct timeval *) &_sched_tod, NULL);
85 TIMEVAL_TO_TIMESPEC(&tv, ¤t_time1);
87 /* Calculate the remaining time to sleep: */
88 remaining_time.tv_sec = time_to_sleep->tv_sec + current_time.tv_sec - current_time1.tv_sec;
89 remaining_time.tv_nsec = time_to_sleep->tv_nsec + current_time.tv_nsec - current_time1.tv_nsec;
91 /* Check if the nanosecond field has underflowed: */
92 if (remaining_time.tv_nsec < 0) {
93 /* Handle the underflow: */
94 remaining_time.tv_sec -= 1;
95 remaining_time.tv_nsec += 1000000000;
98 /* Check if the nanosecond field has overflowed: */
99 if (remaining_time.tv_nsec >= 1000000000) {
100 /* Handle the overflow: */
101 remaining_time.tv_sec += 1;
102 remaining_time.tv_nsec -= 1000000000;
105 /* Check if the sleep was longer than the required time: */
106 if (remaining_time.tv_sec < 0) {
107 /* Reset the time left: */
108 remaining_time.tv_sec = 0;
109 remaining_time.tv_nsec = 0;
112 /* Check if the time remaining is to be returned: */
113 if (time_remaining != NULL) {
114 /* Return the actual time slept: */
115 time_remaining->tv_sec = remaining_time.tv_sec;
116 time_remaining->tv_nsec = remaining_time.tv_nsec;
119 /* Check if the sleep was interrupted: */
120 if (curthread->interrupted) {
121 /* Return an EINTR error : */
130 __nanosleep(const struct timespec * time_to_sleep, struct timespec *
135 _thread_enter_cancellation_point();
136 ret = _nanosleep(time_to_sleep, time_remaining);
137 _thread_leave_cancellation_point();