diff options
Diffstat (limited to 'lib/libc_r/uthread/uthread_nanosleep.c')
| -rw-r--r-- | lib/libc_r/uthread/uthread_nanosleep.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/lib/libc_r/uthread/uthread_nanosleep.c b/lib/libc_r/uthread/uthread_nanosleep.c new file mode 100644 index 000000000000..e91ca5765113 --- /dev/null +++ b/lib/libc_r/uthread/uthread_nanosleep.c @@ -0,0 +1,87 @@ +/* + * 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 |