/* $NetBSD: lwpctl.c,v 1.2 2008/04/28 20:23:07 martin Exp $ */ /*- * Copyright (c) 2008 The NetBSD Foundation, Inc. * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ #include <sys/types.h> #include <sys/lwpctl.h> #include <lwp.h> #include <stdio.h> #include <unistd.h> #include <err.h> int main(void) { lwpctl_t *lc; struct timespec ts; int ctr1, ctr2; if (_lwp_ctl(LWPCTL_FEATURE_PCTR, &lc) != 0) err(1, "_lwp_ctl"); /* Ensure that preemption is reported. */ ctr1 = lc->lc_pctr; printf("pctr = %d\n", ctr1); ts.tv_nsec = 10*1000000; ts.tv_sec = 0; nanosleep(&ts, 0); ctr2 = lc->lc_pctr; printf("pctr = %d\n", ctr2); if (ctr1 == ctr2) errx(1, "counters match"); return 0; }