012dfd00b3
Submitted by: john birrel One version of the pthreads library another will follow with differnt actions under some cases.. not QUITE complete
88 lines
3.5 KiB
C
88 lines
3.5 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>
|
|
#ifdef _THREAD_SAFE
|
|
#include <pthread.h>
|
|
#include "pthread_private.h"
|
|
|
|
int
|
|
nanosleep(struct timespec * time_to_sleep, struct timespec * time_remaining)
|
|
{
|
|
struct timespec current_time;
|
|
struct timespec current_time1;
|
|
struct timeval tv;
|
|
|
|
/* 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.ts_sec = current_time.ts_sec + time_to_sleep->ts_sec;
|
|
_thread_run->wakeup_time.ts_nsec = current_time.ts_nsec + time_to_sleep->ts_nsec;
|
|
|
|
/* Check if the nanosecond field has overflowed: */
|
|
if (_thread_run->wakeup_time.ts_nsec >= 1000000000) {
|
|
/* Wrap the nanosecond field: */
|
|
_thread_run->wakeup_time.ts_sec += 1;
|
|
_thread_run->wakeup_time.ts_nsec -= 1000000000;
|
|
}
|
|
/* Reschedule the current thread to sleep: */
|
|
_thread_kern_sched_state(PS_SLEEP_WAIT, __FILE__, __LINE__);
|
|
|
|
/* Check if the time remaining is to be returned: */
|
|
if (time_remaining != NULL) {
|
|
/* Get the current time: */
|
|
gettimeofday(&tv, NULL);
|
|
TIMEVAL_TO_TIMESPEC(&tv, ¤t_time1);
|
|
|
|
/* Return the actual time slept: */
|
|
time_remaining->ts_sec = time_to_sleep->ts_sec + current_time1.ts_sec - current_time.ts_sec;
|
|
time_remaining->ts_nsec = time_to_sleep->ts_nsec + current_time1.ts_nsec - current_time.ts_nsec;
|
|
|
|
/* Check if the nanosecond field has underflowed: */
|
|
if (time_remaining->ts_nsec < 0) {
|
|
/* Handle the underflow: */
|
|
time_remaining->ts_sec -= 1;
|
|
time_remaining->ts_nsec += 1000000000;
|
|
}
|
|
/* Check if the sleep was longer than the required time: */
|
|
if (time_remaining->ts_sec < 0) {
|
|
/* Reset the time teft: */
|
|
time_remaining->ts_sec = 0;
|
|
time_remaining->ts_nsec = 0;
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
#endif
|