0N/A/*
0N/A * CDDL HEADER START
0N/A *
0N/A * The contents of this file are subject to the terms
0N/A * of the Common Development and Distribution License
0N/A * (the "License"). You may not use this file except
0N/A * in compliance with the License.
0N/A *
0N/A * You can obtain a copy of the license at
0N/A * src/OPENSOLARIS.LICENSE
0N/A * or http://www.opensolaris.org/os/licensing.
0N/A * See the License for the specific language governing
0N/A * permissions and limitations under the License.
0N/A *
0N/A * When distributing Covered Code, include this CDDL
0N/A * HEADER in each file and include the License file at
0N/A * usr/src/OPENSOLARIS.LICENSE. If applicable,
0N/A * add the following below this CDDL HEADER, with the
0N/A * fields enclosed by brackets "[]" replaced with your
0N/A * own identifying information: Portions Copyright [yyyy]
0N/A * [name of copyright owner]
0N/A *
0N/A * CDDL HEADER END
0N/A */
0N/A
0N/A/*
0N/A * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
0N/A * Use is subject to license terms.
0N/A */
0N/A
0N/A/*
0N/A * The "cascade" test case is a multiprocess/multithread batten-passing model
0N/A * using lock primitives alone for synchronisation. Threads are arranged in a
0N/A * ring. Each thread has two locks of its own on which it blocks, and is able
0N/A * to manipulate the two locks belonging to the thread which follows it in the
0N/A * ring.
0N/A *
0N/A * The number of threads (nthreads) is specified by the generic libMicro -P/-T
0N/A * options. With nthreads == 1 (the default) the uncontended case can be timed.
0N/A *
0N/A * The main logic is generic and allows any simple blocking API to be tested.
0N/A * The API-specific component is clearly indicated.
0N/A */
0N/A
0N/A#include <unistd.h>
0N/A#include <stdlib.h>
0N/A#include <stdio.h>
0N/A#include <fcntl.h>
0N/A
0N/A#include "libmicro.h"
0N/A
0N/Atypedef struct {
0N/A int ts_once;
0N/A int ts_id;
0N/A int ts_us0; /* our lock indices */
0N/A int ts_us1;
0N/A int ts_them0; /* their lock indices */
0N/A int ts_them1;
0N/A} tsd_t;
0N/A
0N/Astatic int nthreads;
0N/A
0N/A/*
0N/A * API-specific code BEGINS here
0N/A */
0N/A
0N/A#define DEFD "/tmp"
0N/A
0N/Astatic char *optd = DEFD;
0N/Astatic int file;
0N/Astatic int nlocks;
0N/A
0N/Aint
0N/Abenchmark_init()
0N/A{
0N/A lm_tsdsize = sizeof (tsd_t);
0N/A
0N/A (void) sprintf(lm_optstr, "d:");
0N/A
0N/A lm_defN = "cscd_fcntl";
0N/A
0N/A (void) sprintf(lm_usage,
0N/A " [-d directory for temp file (default %s)]\n"
0N/A "notes: thread cascade using fcntl region locking\n",
0N/A DEFD);
0N/A
0N/A return (0);
0N/A}
0N/A
0N/Aint
0N/Abenchmark_optswitch(int opt, char *optarg)
0N/A{
0N/A switch (opt) {
0N/A case 'd':
0N/A optd = optarg;
0N/A break;
0N/A default:
0N/A return (-1);
0N/A }
0N/A return (0);
0N/A}
0N/A
0N/Aint
0N/Abenchmark_initrun()
0N/A{
0N/A int errors = 0;
0N/A char fname[1024];
0N/A
0N/A nthreads = lm_optP * lm_optT;
0N/A nlocks = nthreads * 2;
0N/A
0N/A (void) sprintf(fname, "%s/cascade.%ld", optd, getpid());
0N/A
0N/A file = open(fname, O_CREAT | O_TRUNC | O_RDWR, 0600);
0N/A if (file == -1) {
0N/A errors++;
0N/A }
0N/A
0N/A if (unlink(fname)) {
0N/A errors++;
0N/A }
0N/A
0N/A if (ftruncate(file, nlocks * 3) == -1) {
0N/A errors++;
0N/A }
0N/A
0N/A return (errors);
0N/A}
0N/A
0N/Aint
0N/Ablock(int index)
0N/A{
0N/A struct flock fl;
0N/A
0N/A fl.l_type = F_WRLCK;
0N/A fl.l_whence = SEEK_SET;
0N/A fl.l_start = index;
0N/A fl.l_len = 1;
0N/A return (fcntl(file, F_SETLKW, &fl) == -1);
0N/A}
0N/A
0N/Aint
0N/Aunblock(int index)
0N/A{
0N/A struct flock fl;
0N/A
0N/A fl.l_type = F_UNLCK;
0N/A fl.l_whence = SEEK_SET;
0N/A fl.l_start = index;
0N/A fl.l_len = 1;
0N/A return (fcntl(file, F_SETLK, &fl) == -1);
0N/A}
0N/A
0N/A/*
0N/A * API-specific code ENDS here
0N/A */
0N/A
0N/Aint
0N/Abenchmark_initbatch(void *tsd)
0N/A{
0N/A tsd_t *ts = (tsd_t *)tsd;
0N/A int e = 0;
0N/A
0N/A if (ts->ts_once == 0) {
0N/A int us, them;
0N/A
0N/A us = (getpindex() * lm_optT) + gettindex();
0N/A them = (us + 1) % (lm_optP * lm_optT);
0N/A
0N/A ts->ts_id = us;
0N/A
0N/A /* lock index asignment for us and them */
0N/A ts->ts_us0 = (us * 4);
0N/A ts->ts_us1 = (us * 4) + 2;
0N/A if (us < nthreads - 1) {
0N/A /* straight-thru connection to them */
0N/A ts->ts_them0 = (them * 4);
0N/A ts->ts_them1 = (them * 4) + 2;
0N/A } else {
0N/A /* cross-over connection to them */
0N/A ts->ts_them0 = (them * 4) + 2;
0N/A ts->ts_them1 = (them * 4);
0N/A }
0N/A
0N/A ts->ts_once = 1;
0N/A }
0N/A
0N/A /* block their first move */
0N/A e += block(ts->ts_them0);
0N/A
0N/A return (e);
0N/A}
0N/A
0N/Aint
0N/Abenchmark(void *tsd, result_t *res)
0N/A{
0N/A tsd_t *ts = (tsd_t *)tsd;
0N/A int i;
0N/A int e = 0;
0N/A
0N/A /* wait to be unblocked (id == 0 will not block) */
0N/A e += block(ts->ts_us0);
0N/A
0N/A for (i = 0; i < lm_optB; i += 2) {
0N/A /* allow them to block us again */
0N/A e += unblock(ts->ts_us0);
0N/A
0N/A /* block their next + 1 move */
0N/A e += block(ts->ts_them1);
0N/A
0N/A /* unblock their next move */
0N/A e += unblock(ts->ts_them0);
0N/A
0N/A /* wait for them to unblock us */
0N/A e += block(ts->ts_us1);
0N/A
0N/A /* repeat with locks reversed */
0N/A e += unblock(ts->ts_us1);
0N/A e += block(ts->ts_them0);
0N/A e += unblock(ts->ts_them1);
0N/A e += block(ts->ts_us0);
0N/A }
0N/A
0N/A /* finish batch with nothing blocked */
0N/A e += unblock(ts->ts_them0);
0N/A e += unblock(ts->ts_us0);
0N/A
0N/A res->re_count = i;
0N/A res->re_errors = e;
0N/A
0N/A return (0);
0N/A}