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