/* $OpenBSD: switch.c,v 1.7 2022/12/04 23:50:46 cheloha Exp $ */ /* * Copyright (c) 1993, 1994, 1995, 1996 by Chris Provenzano and contributors, * proven@mit.edu All rights reserved. * * 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 Chris Provenzano, * the University of California, Berkeley, and contributors. * 4. Neither the name of Chris Provenzano, the University, nor the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO 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 CHRIS PROVENZANO, 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. */ /* ==== test_switch.c ======================================================== * Copyright (c) 1993 by Chris Provenzano, proven@athena.mit.edu * * Description : Test context switch functionality. * * 1.00 93/08/04 proven * -Started coding this file. */ #include #include #include #include #include #include #include "test.h" const char buf[] = "abcdefghijklmnopqrstuvwxyz"; char x[sizeof(buf)]; volatile int ending = 0; /* ========================================================================== * usage(); */ static __dead void usage(void) { fprintf(stderr, "usage: %s [-c count]\n", getprogname()); fprintf(stderr, "count is number of theads, between 2 and 26\n"); exit(1); } static void * new_thread(void *arg) { int i; SET_NAME("writer"); while (!ending) { CHECKe(write(STDOUT_FILENO, (char *) arg, 1)); x[(char *)arg - buf] = 1; for (i = 0; i < 999999; i += 1) ; } return NULL; } int main(int argc, char *argv[]) { pthread_t thread; int ch, count = 4; long i; const char *errstr; while ((ch = getopt(argc, argv, "c:")) != -1) { switch (ch) { case 'c': count = strtonum(optarg, 2, 26, &errstr); if (errstr != NULL) errx(1, "count is %s: %s", errstr, optarg); break; default: usage(); } } /* create the threads */ for (i = 0; i < count; i++) CHECKr(pthread_create(&thread, NULL, new_thread, (void*)(buf+i))); /* give all threads a chance to run */ sleep (2); ending = 1; for (i = 0; i < count; i++) ASSERT(x[i]); /* make sure each thread ran */ CHECKe(write(STDOUT_FILENO, "\n", 1)); SUCCEED; }