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309 lines
10 KiB
C
309 lines
10 KiB
C
/*
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* Copyright (c) 1997-1998 University of Utah and the Flux Group.
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* All rights reserved.
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*
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* This file is part of the Flux OSKit. The OSKit is free software, also known
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* as "open source;" you can redistribute it and/or modify it under the terms
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* of the GNU General Public License (GPL), version 2, as published by the Free
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* Software Foundation (FSF). To explore alternate licensing terms, contact
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* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
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*
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* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
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* received a copy of the GPL along with the OSKit; see the file COPYING. If
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* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
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*/
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/*
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* I am having no mercy with this file.
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* I ripped out everything I didn't need
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*/
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/*-
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* Copyright (c) 1982, 1986, 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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* @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
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* $\Id: kern_clock.c,v 1.26 1996/07/30 16:59:22 bde Exp $
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*/
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/* Portions of this software are covered by the following: */
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/******************************************************************************
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* *
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* Copyright (c) David L. Mills 1993, 1994 *
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* *
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* Permission to use, copy, modify, and distribute this software and its *
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* documentation for any purpose and without fee is hereby granted, provided *
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* that the above copyright notice appears in all copies and that both the *
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* copyright notice and this permission notice appear in supporting *
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* documentation, and that the name University of Delaware not be used in *
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* advertising or publicity pertaining to distribution of the software *
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* without specific, written prior permission. The University of Delaware *
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* makes no representations about the suitability this software for any *
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* purpose. It is provided "as is" without express or implied warranty. *
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* *
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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/callout.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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/* Exported to machdep.c. */
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struct callout *callfree, *callout;
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struct callout calltodo;
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long tk_cancc;
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long tk_nin;
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long tk_nout;
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long tk_rawcc;
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/*
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* Clock handling routines.
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*
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* This code is written to operate with two timers that run independently of
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* each other. The main clock, running hz times per second, is used to keep
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* track of real time. The second timer handles kernel and user profiling,
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* and does resource use estimation. If the second timer is programmable,
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* it is randomized to avoid aliasing between the two clocks. For example,
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* the randomization prevents an adversary from always giving up the cpu
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* just before its quantum expires. Otherwise, it would never accumulate
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* cpu ticks. The mean frequency of the second timer is stathz.
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*
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* If no second timer exists, stathz will be zero; in this case we drive
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* profiling and statistics off the main clock. This WILL NOT be accurate;
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* do not do it unless absolutely necessary.
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*
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* The statistics clock may (or may not) be run at a higher rate while
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* profiling. This profile clock runs at profhz. We require that profhz
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* be an integral multiple of stathz.
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*
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* If the statistics clock is running fast, it must be divided by the ratio
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* profhz/stathz for statistics. (For profiling, every tick counts.)
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*/
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/*
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* TODO:
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* allocate more timeout table slots when table overflows.
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*/
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/*
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* Bump a timeval by a small number of usec's.
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*/
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#define BUMPTIME(t, usec) { \
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register volatile struct timeval *tp = (t); \
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register long us; \
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\
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tp->tv_usec = us = tp->tv_usec + (usec); \
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if (us >= 1000000) { \
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tp->tv_usec = us - 1000000; \
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tp->tv_sec++; \
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} \
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}
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int ticks;
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volatile struct timeval kern_time;
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volatile struct timeval mono_time;
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/*
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* Software (low priority) clock interrupt.
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* Run periodic events from timeout queue.
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*/
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/*ARGSUSED*/
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void
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softclock()
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{
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register struct callout *c;
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register void *arg;
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register void (*func) __P((void *));
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register int s;
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s = splhigh();
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while ((c = calltodo.c_next) != NULL && c->c_time <= 0) {
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func = c->c_func;
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arg = c->c_arg;
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calltodo.c_next = c->c_next;
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c->c_next = callfree;
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callfree = c;
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splx(s);
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(*func)(arg);
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(void) splhigh();
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}
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splx(s);
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}
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/*
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* timeout --
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* Execute a function after a specified length of time.
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*
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* untimeout --
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* Cancel previous timeout function call.
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*
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* See AT&T BCI Driver Reference Manual for specification. This
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* implementation differs from that one in that no identification
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* value is returned from timeout, rather, the original arguments
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* to timeout are used to identify entries for untimeout.
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*/
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void
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timeout(ftn, arg, ticks)
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timeout_t ftn;
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void *arg;
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register int ticks;
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{
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register struct callout *new, *p, *t;
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register int s;
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if (ticks <= 0)
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ticks = 1;
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/* Lock out the clock. */
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s = splhigh();
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/* Fill in the next free callout structure. */
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if (callfree == NULL)
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panic("timeout table full");
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new = callfree;
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callfree = new->c_next;
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new->c_arg = arg;
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new->c_func = ftn;
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/*
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* The time for each event is stored as a difference from the time
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* of the previous event on the queue. Walk the queue, correcting
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* the ticks argument for queue entries passed. Correct the ticks
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* value for the queue entry immediately after the insertion point
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* as well. Watch out for negative c_time values; these represent
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* overdue events.
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*/
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for (p = &calltodo;
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(t = p->c_next) != NULL && ticks > t->c_time; p = t)
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if (t->c_time > 0)
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ticks -= t->c_time;
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new->c_time = ticks;
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if (t != NULL)
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t->c_time -= ticks;
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/* Insert the new entry into the queue. */
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p->c_next = new;
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new->c_next = t;
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splx(s);
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}
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void
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untimeout(ftn, arg)
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timeout_t ftn;
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void *arg;
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{
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register struct callout *p, *t;
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register int s;
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s = splhigh();
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for (p = &calltodo; (t = p->c_next) != NULL; p = t)
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if (t->c_func == ftn && t->c_arg == arg) {
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/* Increment next entry's tick count. */
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if (t->c_next && t->c_time > 0)
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t->c_next->c_time += t->c_time;
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/* Move entry from callout queue to callfree queue. */
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p->c_next = t->c_next;
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t->c_next = callfree;
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callfree = t;
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break;
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}
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splx(s);
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}
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/*
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* Compute number of hz until specified time. Used to
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* compute third argument to timeout() from an absolute time.
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*/
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int
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hzto(tv)
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struct timeval *tv;
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{
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register unsigned long ticks;
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register long sec, usec;
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int s;
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/*
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* If the number of usecs in the whole seconds part of the time
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* difference fits in a long, then the total number of usecs will
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* fit in an unsigned long. Compute the total and convert it to
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* ticks, rounding up and adding 1 to allow for the current tick
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* to expire. Rounding also depends on unsigned long arithmetic
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* to avoid overflow.
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*
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* Otherwise, if the number of ticks in the whole seconds part of
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* the time difference fits in a long, then convert the parts to
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* ticks separately and add, using similar rounding methods and
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* overflow avoidance. This method would work in the previous
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* case but it is slightly slower and assumes that hz is integral.
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*
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* Otherwise, round the time difference down to the maximum
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* representable value.
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*
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* If ints have 32 bits, then the maximum value for any timeout in
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* 10ms ticks is 248 days.
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*/
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s = splclock();
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sec = tv->tv_sec - kern_time.tv_sec;
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usec = tv->tv_usec - kern_time.tv_usec;
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splx(s);
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if (usec < 0) {
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sec--;
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usec += 1000000;
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}
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if (sec < 0) {
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#ifdef DIAGNOSTIC
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printf("hzto: negative time difference %ld sec %ld usec\n",
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sec, usec);
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#endif
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ticks = 1;
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} else if (sec <= LONG_MAX / 1000000)
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ticks = (sec * 1000000 + (unsigned long)usec + (tick - 1))
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/ tick + 1;
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else if (sec <= LONG_MAX / hz)
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ticks = sec * hz
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+ ((unsigned long)usec + (tick - 1)) / tick + 1;
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else
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ticks = LONG_MAX;
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if (ticks > INT_MAX)
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ticks = INT_MAX;
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return (ticks);
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}
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