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Diffstat (limited to 'sys/kern/kern_threads.c')
| -rw-r--r-- | sys/kern/kern_threads.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/sys/kern/kern_threads.c b/sys/kern/kern_threads.c new file mode 100644 index 0000000..30e15c9 --- /dev/null +++ b/sys/kern/kern_threads.c @@ -0,0 +1,168 @@ +/* + * + * 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. + * + * $Id$ + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/filedesc.h> +#include <sys/kernel.h> +#include <sys/malloc.h> +#include <sys/proc.h> +#include <sys/resourcevar.h> +#include <sys/vnode.h> +#include <sys/file.h> +#include <sys/acct.h> +#include <sys/ktrace.h> +#include <sys/sysproto.h> +#include <sys/unistd.h> + +#include <vm/vm.h> + +#include <machine/cpu.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 *retval) { + int sleepStart; + long long sleeptime; + int sleepclocks; + struct timespec ts; + int error; + + sleepclocks = 0; + if (uap->timeout != 0) { + /* + * Get timespec struct + */ + if (error = copyin((caddr_t) uap->timeout, (caddr_t) &ts, sizeof ts)) { + p->p_wakeup = 0; + return error; + } + sleeptime = (long long) (hz * ts.tv_nsec); + sleeptime /= 1000000000LL; + sleeptime += ts.tv_sec * hz; + sleepclocks = sleeptime; + if (sleepclocks != sleeptime) { + p->p_wakeup = 0; + retval[0] = EINVAL; + return 0; + } + if (sleepclocks == 0) + sleepclocks = 1; + } + + retval[0] = 0; + if (p->p_wakeup == 0) { + sleepStart = ticks; + p->p_flag |= P_SINTR; + error = tsleep(p, PUSER, "thrslp", sleepclocks); + p->p_flag &= ~P_SINTR; + if (error == EWOULDBLOCK) { + p->p_wakeup = 0; + retval[0] = EAGAIN; + return 0; + } + if (uap->timeout == 0) + retval[0] = ticks - sleepStart; + } + p->p_wakeup = 0; + return (0); +} + +int +thr_wakeup(struct proc *p, struct thr_wakeup_args *uap, int *retval) { + struct proc *pSlave = p->p_leader; + + while(pSlave && (pSlave->p_pid != uap->pid)) + pSlave = pSlave->p_peers; + + if(pSlave == 0) { + retval[0] = ESRCH; + return(0); + } + + pSlave->p_wakeup++; + if((pSlave->p_stat == SSLEEP) && (pSlave->p_wchan == pSlave)) { + wakeup(pSlave); + return(0); + } + + retval[0] = EAGAIN; + return 0; +} + +/* + * General purpose yield system call + */ +int +yield(struct proc *p, struct yield_args *uap, int *retval) { + int s; + + retval[0] = 0; + + s = splhigh(); + p->p_priority = MAXPRI; + setrunqueue(p); + mi_switch(); + splx(s); + + return(0); +} + |
