mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-19 10:53:58 +00:00
f4084c0544
The addition of the nanosleep syscall was correctly added to libc/sys/Makefile so that it is renamed as _thread_sys_nanosleep(). This syscall is one of those that libc_r has to re-implement because the only behaviour is to block the process. So libc_r just ignores the fact that a nanosleep syscall exists and goes its own way - as it has done all along .... and now it does again. And now a simple program can sleep again. Phew.
119 lines
4.3 KiB
C
119 lines
4.3 KiB
C
/*
|
|
* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by John Birrell.
|
|
* 4. Neither the name of the author nor the names of any co-contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*/
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#ifdef _THREAD_SAFE
|
|
#include <pthread.h>
|
|
#include "pthread_private.h"
|
|
|
|
int
|
|
nanosleep(const struct timespec * time_to_sleep,
|
|
struct timespec * time_remaining)
|
|
{
|
|
int ret = 0;
|
|
struct timespec current_time;
|
|
struct timespec current_time1;
|
|
struct timespec remaining_time;
|
|
struct timeval tv;
|
|
|
|
/* Check if the time to sleep is legal: */
|
|
if (time_to_sleep == NULL || time_to_sleep->tv_nsec < 0 || time_to_sleep->tv_nsec > 1000000000) {
|
|
/* Return an EINVAL error : */
|
|
errno = EINVAL;
|
|
ret = -1;
|
|
} else {
|
|
/* Get the current time: */
|
|
gettimeofday(&tv, NULL);
|
|
TIMEVAL_TO_TIMESPEC(&tv, ¤t_time);
|
|
|
|
/* Calculate the time for the current thread to wake up: */
|
|
_thread_run->wakeup_time.tv_sec = current_time.tv_sec + time_to_sleep->tv_sec;
|
|
_thread_run->wakeup_time.tv_nsec = current_time.tv_nsec + time_to_sleep->tv_nsec;
|
|
|
|
/* Check if the nanosecond field has overflowed: */
|
|
if (_thread_run->wakeup_time.tv_nsec >= 1000000000) {
|
|
/* Wrap the nanosecond field: */
|
|
_thread_run->wakeup_time.tv_sec += 1;
|
|
_thread_run->wakeup_time.tv_nsec -= 1000000000;
|
|
}
|
|
|
|
/* Reschedule the current thread to sleep: */
|
|
_thread_kern_sched_state(PS_SLEEP_WAIT, __FILE__, __LINE__);
|
|
|
|
/* Get the current time: */
|
|
gettimeofday(&tv, NULL);
|
|
TIMEVAL_TO_TIMESPEC(&tv, ¤t_time1);
|
|
|
|
/* Calculate the remaining time to sleep: */
|
|
remaining_time.tv_sec = time_to_sleep->tv_sec + current_time.tv_sec - current_time1.tv_sec;
|
|
remaining_time.tv_nsec = time_to_sleep->tv_nsec + current_time.tv_nsec - current_time1.tv_nsec;
|
|
|
|
/* Check if the nanosecond field has underflowed: */
|
|
if (remaining_time.tv_nsec < 0) {
|
|
/* Handle the underflow: */
|
|
remaining_time.tv_sec -= 1;
|
|
remaining_time.tv_nsec += 1000000000;
|
|
}
|
|
|
|
/* Check if the nanosecond field has overflowed: */
|
|
if (remaining_time.tv_nsec >= 1000000000) {
|
|
/* Handle the overflow: */
|
|
remaining_time.tv_sec += 1;
|
|
remaining_time.tv_nsec -= 1000000000;
|
|
}
|
|
|
|
/* Check if the sleep was longer than the required time: */
|
|
if (remaining_time.tv_sec < 0) {
|
|
/* Reset the time left: */
|
|
remaining_time.tv_sec = 0;
|
|
remaining_time.tv_nsec = 0;
|
|
}
|
|
|
|
/* Check if the time remaining is to be returned: */
|
|
if (time_remaining != NULL) {
|
|
/* Return the actual time slept: */
|
|
time_remaining->tv_sec = remaining_time.tv_sec;
|
|
time_remaining->tv_nsec = remaining_time.tv_nsec;
|
|
}
|
|
|
|
/* Check if the entire sleep was not completed: */
|
|
if (remaining_time.tv_nsec != 0 || remaining_time.tv_sec != 0) {
|
|
/* Return an EINTR error : */
|
|
errno = EINTR;
|
|
ret = -1;
|
|
}
|
|
}
|
|
return (ret);
|
|
}
|
|
#endif
|