55613576f5
KSEs when it's thread exits; allow the GC handler to do that.
o Make spinlock/spinlock critical regions.
The following were submitted by davidxu
o Alow thr_switch() to take a null mailbox argument.
o Better protect cancellation checks.
o Don't set KSE specific data when creating new KSEs; rely on the
first upcall of the KSE to set it.
o Add the ability to set the maximum concurrency level and do this
automatically. We should have a way to enable/disable this with
some sort of tunable because some applications may not want this
to be the default.
o Hold the scheduling lock across thread switch calls.
o If scheduling of a thread fails, make sure to remove it from the list
of active threads.
o Better protect accesses to a joining threads when the target thread is
exited and detached.
o Remove some macro definitions that are now provided by <sys/kse.h>.
o Don't leave the library in threaded mode if creation of the initial
KSE fails.
o Wakeup idle KSEs when there are threads ready to run.
o Maintain the number of threads active in the priority queue.
129 lines
4.2 KiB
C
129 lines
4.2 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 AUTHOR 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <pthread.h>
|
|
#include "thr_private.h"
|
|
|
|
__weak_reference(__nanosleep, nanosleep);
|
|
|
|
int
|
|
_nanosleep(const struct timespec *time_to_sleep,
|
|
struct timespec *time_remaining)
|
|
{
|
|
struct pthread *curthread = _get_curthread();
|
|
int ret = 0;
|
|
struct timespec ts, ts1;
|
|
struct timespec remaining_time;
|
|
|
|
/* Check if the time to sleep is legal: */
|
|
if ((time_to_sleep == NULL) || (time_to_sleep->tv_sec < 0) ||
|
|
(time_to_sleep->tv_nsec < 0) ||
|
|
(time_to_sleep->tv_nsec >= 1000000000)) {
|
|
/* Return an EINVAL error : */
|
|
errno = EINVAL;
|
|
ret = -1;
|
|
} else {
|
|
KSE_GET_TOD(curthread->kse, &ts);
|
|
|
|
/* Calculate the time for the current thread to wake up: */
|
|
TIMESPEC_ADD(&curthread->wakeup_time, &ts, time_to_sleep);
|
|
|
|
THR_LOCK_SWITCH(curthread);
|
|
curthread->interrupted = 0;
|
|
|
|
THR_SET_STATE(curthread, PS_SLEEP_WAIT);
|
|
|
|
/* Reschedule the current thread to sleep: */
|
|
_thr_sched_switch(curthread);
|
|
THR_UNLOCK_SWITCH(curthread);
|
|
|
|
/* Calculate the remaining time to sleep: */
|
|
KSE_GET_TOD(curthread->kse, &ts1);
|
|
remaining_time.tv_sec = time_to_sleep->tv_sec
|
|
+ ts.tv_sec - ts1.tv_sec;
|
|
remaining_time.tv_nsec = time_to_sleep->tv_nsec
|
|
+ ts.tv_nsec - ts1.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: */
|
|
else 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 sleep was interrupted: */
|
|
if (curthread->interrupted) {
|
|
/* Return an EINTR error : */
|
|
errno = EINTR;
|
|
ret = -1;
|
|
}
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
__nanosleep(const struct timespec *time_to_sleep,
|
|
struct timespec *time_remaining)
|
|
{
|
|
struct pthread *curthread = _get_curthread();
|
|
int ret;
|
|
|
|
_thr_enter_cancellation_point(curthread);
|
|
ret = _nanosleep(time_to_sleep, time_remaining);
|
|
_thr_leave_cancellation_point(curthread);
|
|
|
|
return (ret);
|
|
}
|