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
32 #include "namespace.h"
36 #include "un-namespace.h"
37 #include "thr_private.h"
39 int __nanosleep(const struct timespec *time_to_sleep,
40 struct timespec *time_remaining);
42 __weak_reference(__nanosleep, nanosleep);
45 _nanosleep(const struct timespec *time_to_sleep,
46 struct timespec *time_remaining)
48 struct pthread *curthread = _get_curthread();
50 struct timespec ts, ts1;
51 struct timespec remaining_time;
52 struct timespec wakeup_time;
54 /* Check if the time to sleep is legal: */
55 if ((time_to_sleep == NULL) || (time_to_sleep->tv_sec < 0) ||
56 (time_to_sleep->tv_nsec < 0) ||
57 (time_to_sleep->tv_nsec >= 1000000000)) {
58 /* Return an EINVAL error : */
62 if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM)
63 return (__sys_nanosleep(time_to_sleep, time_remaining));
65 KSE_GET_TOD(curthread->kse, &ts);
67 /* Calculate the time for the current thread to wake up: */
68 TIMESPEC_ADD(&wakeup_time, &ts, time_to_sleep);
70 THR_LOCK_SWITCH(curthread);
71 curthread->interrupted = 0;
72 curthread->wakeup_time = wakeup_time;
73 THR_SET_STATE(curthread, PS_SLEEP_WAIT);
75 /* Reschedule the current thread to sleep: */
76 _thr_sched_switch_unlocked(curthread);
78 /* Calculate the remaining time to sleep: */
79 KSE_GET_TOD(curthread->kse, &ts1);
80 remaining_time.tv_sec = time_to_sleep->tv_sec
81 + ts.tv_sec - ts1.tv_sec;
82 remaining_time.tv_nsec = time_to_sleep->tv_nsec
83 + ts.tv_nsec - ts1.tv_nsec;
85 /* Check if the nanosecond field has underflowed: */
86 if (remaining_time.tv_nsec < 0) {
87 /* Handle the underflow: */
88 remaining_time.tv_sec -= 1;
89 remaining_time.tv_nsec += 1000000000;
91 /* Check if the nanosecond field has overflowed: */
92 else if (remaining_time.tv_nsec >= 1000000000) {
93 /* Handle the overflow: */
94 remaining_time.tv_sec += 1;
95 remaining_time.tv_nsec -= 1000000000;
98 /* Check if the sleep was longer than the required time: */
99 if (remaining_time.tv_sec < 0) {
100 /* Reset the time left: */
101 remaining_time.tv_sec = 0;
102 remaining_time.tv_nsec = 0;
105 /* Check if the time remaining is to be returned: */
106 if (time_remaining != NULL) {
107 /* Return the actual time slept: */
108 time_remaining->tv_sec = remaining_time.tv_sec;
109 time_remaining->tv_nsec = remaining_time.tv_nsec;
112 /* Check if the sleep was interrupted: */
113 if (curthread->interrupted) {
114 /* Return an EINTR error : */
123 __nanosleep(const struct timespec *time_to_sleep,
124 struct timespec *time_remaining)
126 struct pthread *curthread = _get_curthread();
129 _thr_cancel_enter(curthread);
130 ret = _nanosleep(time_to_sleep, time_remaining);
131 _thr_cancel_leave(curthread, 1);