161 lines
4.6 KiB
C
161 lines
4.6 KiB
C
/*
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*
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* Portions of this code was derived from the file kern_fork.c and as such
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* is subject to the copyrights below.
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*
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* Copyright (c) 1982, 1986, 1989, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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 the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its 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 THE REGENTS 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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* Copyright (c) 1996 Douglas Santry
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*
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* This code is subject to the beer copyright. If I chance to meet you in a
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* bar and this code helped you in some way, you owe me a beer. Only
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* in Germany will I accept domestic beer. This code may or may not work
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* and I certainly make no claims as to its fitness for *any* purpose.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/sysproto.h>
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/*
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* Low level support for sleep/wakeup paradigm
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* If a timeout is specified:
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* returns 0 if wakeup
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* returns EAGAIN if timed out
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* returns EINVAL if error
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*
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* If a timeout is not specified:
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*
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* returns time waiting in ticks.
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*/
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int
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thr_sleep(struct proc *p, struct thr_sleep_args *uap) {
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int sleepstart;
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struct timespec ts;
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struct timeval atv;
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int error, timo;
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timo = 0;
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if (uap->timeout != 0) {
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/*
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* Get timespec struct
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*/
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if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0) {
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p->p_wakeup = 0;
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return error;
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}
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if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000) {
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p->p_wakeup = 0;
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return (EINVAL);
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}
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TIMESPEC_TO_TIMEVAL(&atv, &ts);
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if (itimerfix(&atv)) {
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p->p_wakeup = 0;
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return (EINVAL);
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}
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timo = tvtohz(&atv);
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}
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p->p_retval[0] = 0;
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if (p->p_wakeup == 0) {
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sleepstart = ticks;
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p->p_flag |= P_SINTR;
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error = tsleep(p, PRIBIO, "thrslp", timo);
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p->p_flag &= ~P_SINTR;
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if (error == EWOULDBLOCK) {
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p->p_wakeup = 0;
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p->p_retval[0] = EAGAIN;
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return 0;
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}
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if (uap->timeout == 0)
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p->p_retval[0] = ticks - sleepstart;
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}
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p->p_wakeup = 0;
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return (0);
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}
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int
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thr_wakeup(struct proc *p, struct thr_wakeup_args *uap) {
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struct proc *pSlave = p->p_leader;
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while(pSlave && (pSlave->p_pid != uap->pid))
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pSlave = pSlave->p_peers;
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if(pSlave == 0) {
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p->p_retval[0] = ESRCH;
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return(0);
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}
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pSlave->p_wakeup++;
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if((pSlave->p_stat == SSLEEP) && (pSlave->p_wchan == pSlave)) {
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wakeup(pSlave);
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return(0);
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}
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p->p_retval[0] = EAGAIN;
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return 0;
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}
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/*
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* General purpose yield system call
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*/
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int
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yield(struct proc *p, struct yield_args *uap) {
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int s;
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p->p_retval[0] = 0;
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s = splhigh();
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mtx_enter(&sched_lock, MTX_SPIN);
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p->p_priority = MAXPRI;
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setrunqueue(p);
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p->p_stats->p_ru.ru_nvcsw++;
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mi_switch();
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mtx_exit(&sched_lock, MTX_SPIN);
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splx(s);
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return(0);
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}
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