tests/kernel/t_lwpctl.c

   1 /* $NetBSD$ */
   2
   3 /*-
   4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __COPYRIGHT("@(#) Copyright (c) 2008\
  31  The NetBSD Foundation, inc. All rights reserved.");
  32 __RCSID("$NetBSD$");
  33
  34 #include <sys/lwpctl.h>
  35
  36 #include <lwp.h>
  37 #include <stdio.h>
  38 #include <time.h>
  39
  40 #include <atf-c.h>
  41
  42 #include "../h_macros.h"
  43
  44 ATF_TC(lwpctl);
  45 ATF_TC_HEAD(lwpctl, tc)
  46 {
  47         atf_tc_set_md_var(tc, "descr", "Checks lwpctl preemption counter");
  48 }
  49 ATF_TC_BODY(lwpctl, tc)
  50 {
  51         lwpctl_t *lc;
  52         struct timespec ts;
  53         int ctr1, ctr2;
  54
  55         RL(_lwp_ctl(LWPCTL_FEATURE_PCTR, &lc));
  56
  57         /* Ensure that preemption is reported. */
  58         ctr1 = lc->lc_pctr;
  59         (void)printf("pctr = %d\n", ctr1);
  60         ts.tv_nsec = 10*1000000;
  61         ts.tv_sec = 0;
  62         RL(nanosleep(&ts, 0));
  63         ctr2 = lc->lc_pctr;
  64         (void)printf("pctr = %d\n", ctr2);
  65
  66         ATF_REQUIRE_MSG(ctr1 != ctr2, "counters match");
  67 }
  68
  69 ATF_TP_ADD_TCS(tp)
  70 {
  71         ATF_TP_ADD_TC(tp, lwpctl);
  72
  73         return atf_no_error();
  74 }