mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-16 10:20:30 +00:00
157 lines
4.5 KiB
C
157 lines
4.5 KiB
C
/*
|
|
*
|
|
* Portions of this code was derived from the file kern_fork.c and as such
|
|
* is subject to the copyrights below.
|
|
*
|
|
* Copyright (c) 1982, 1986, 1989, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* 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 the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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.
|
|
*
|
|
* Copyright (c) 1996 Douglas Santry
|
|
*
|
|
* This code is subject to the beer copyright. If I chance to meet you in a
|
|
* bar and this code helped you in some way, you owe me a beer. Only
|
|
* in Germany will I accept domestic beer. This code may or may not work
|
|
* and I certainly make no claims as to its fitness for *any* purpose.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/sysproto.h>
|
|
|
|
/*
|
|
* Low level support for sleep/wakeup paradigm
|
|
* If a timeout is specified:
|
|
* returns 0 if wakeup
|
|
* returns EAGAIN if timed out
|
|
* returns EINVAL if error
|
|
*
|
|
* If a timeout is not specified:
|
|
*
|
|
* returns time waiting in ticks.
|
|
*/
|
|
int
|
|
thr_sleep(struct proc *p, struct thr_sleep_args *uap) {
|
|
int sleepstart;
|
|
struct timespec ts;
|
|
struct timeval atv;
|
|
int error, timo;
|
|
|
|
timo = 0;
|
|
if (uap->timeout != 0) {
|
|
/*
|
|
* Get timespec struct
|
|
*/
|
|
if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) {
|
|
p->p_wakeup = 0;
|
|
return error;
|
|
}
|
|
if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000) {
|
|
p->p_wakeup = 0;
|
|
return (EINVAL);
|
|
}
|
|
TIMESPEC_TO_TIMEVAL(&atv, &ts);
|
|
if (itimerfix(&atv)) {
|
|
p->p_wakeup = 0;
|
|
return (EINVAL);
|
|
}
|
|
timo = tvtohz(&atv);
|
|
}
|
|
|
|
p->p_retval[0] = 0;
|
|
if (p->p_wakeup == 0) {
|
|
sleepstart = ticks;
|
|
p->p_flag |= P_SINTR;
|
|
error = tsleep(p, PRIBIO, "thrslp", timo);
|
|
p->p_flag &= ~P_SINTR;
|
|
if (error == EWOULDBLOCK) {
|
|
p->p_wakeup = 0;
|
|
p->p_retval[0] = EAGAIN;
|
|
return 0;
|
|
}
|
|
if (uap->timeout == 0)
|
|
p->p_retval[0] = ticks - sleepstart;
|
|
}
|
|
p->p_wakeup = 0;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
thr_wakeup(struct proc *p, struct thr_wakeup_args *uap) {
|
|
struct proc *pSlave = p->p_leader;
|
|
|
|
while(pSlave && (pSlave->p_pid != uap->pid))
|
|
pSlave = pSlave->p_peers;
|
|
|
|
if(pSlave == 0) {
|
|
p->p_retval[0] = ESRCH;
|
|
return(0);
|
|
}
|
|
|
|
pSlave->p_wakeup++;
|
|
if((pSlave->p_stat == SSLEEP) && (pSlave->p_wchan == pSlave)) {
|
|
wakeup(pSlave);
|
|
return(0);
|
|
}
|
|
|
|
p->p_retval[0] = EAGAIN;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* General purpose yield system call
|
|
*/
|
|
int
|
|
yield(struct proc *p, struct yield_args *uap) {
|
|
int s;
|
|
|
|
p->p_retval[0] = 0;
|
|
|
|
s = splhigh();
|
|
p->p_priority = MAXPRI;
|
|
setrunqueue(p);
|
|
p->p_stats->p_ru.ru_nvcsw++;
|
|
mi_switch();
|
|
splx(s);
|
|
|
|
return(0);
|
|
}
|
|
|