1/* $OpenBSD: switch.c,v 1.7 2022/12/04 23:50:46 cheloha Exp $ */ 2/* 3 * Copyright (c) 1993, 1994, 1995, 1996 by Chris Provenzano and contributors, 4 * proven@mit.edu All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Chris Provenzano, 17 * the University of California, Berkeley, and contributors. 18 * 4. Neither the name of Chris Provenzano, the University, nor the names of 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO, THE REGENTS OR 26 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35/* ==== test_switch.c ======================================================== 36 * Copyright (c) 1993 by Chris Provenzano, proven@athena.mit.edu 37 * 38 * Description : Test context switch functionality. 39 * 40 * 1.00 93/08/04 proven 41 * -Started coding this file. 42 */ 43 44#include <pthread.h> 45#include <stdio.h> 46#include <err.h> 47#include <errno.h> 48#include <unistd.h> 49#include <stdlib.h> 50 51#include "test.h" 52 53const char buf[] = "abcdefghijklmnopqrstuvwxyz"; 54char x[sizeof(buf)]; 55 56volatile int ending = 0; 57 58/* ========================================================================== 59 * usage(); 60 */ 61static __dead void 62usage(void) 63{ 64 fprintf(stderr, "usage: %s [-c count]\n", getprogname()); 65 fprintf(stderr, "count is number of theads, between 2 and 26\n"); 66 exit(1); 67} 68 69static void * 70new_thread(void *arg) 71{ 72 int i; 73 74 SET_NAME("writer"); 75 while (!ending) { 76 CHECKe(write(STDOUT_FILENO, (char *) arg, 1)); 77 x[(char *)arg - buf] = 1; 78 for (i = 0; i < 999999; i += 1) 79 ; 80 } 81 return NULL; 82} 83 84int 85main(int argc, char *argv[]) 86{ 87 pthread_t thread; 88 int ch, count = 4; 89 long i; 90 const char *errstr; 91 92 while ((ch = getopt(argc, argv, "c:")) != -1) { 93 switch (ch) { 94 case 'c': 95 count = strtonum(optarg, 2, 26, &errstr); 96 if (errstr != NULL) 97 errx(1, "count is %s: %s", errstr, optarg); 98 break; 99 default: 100 usage(); 101 } 102 } 103 104 /* create the threads */ 105 for (i = 0; i < count; i++) 106 CHECKr(pthread_create(&thread, NULL, new_thread, 107 (void*)(buf+i))); 108 109 /* give all threads a chance to run */ 110 sleep (2); 111 112 ending = 1; 113 for (i = 0; i < count; i++) 114 ASSERT(x[i]); /* make sure each thread ran */ 115 116 CHECKe(write(STDOUT_FILENO, "\n", 1)); 117 SUCCEED; 118} 119