A test for the lwpctl preemption counter.

regress/sys/kern/Makefile

@@ -1,6 +1,6 @@
-#	$NetBSD: Makefile,v 1.27 2006/09/10 12:23:10 kardel Exp $
+#	$NetBSD: Makefile,v 1.28 2008/03/12 11:02:21 ad Exp $
 
-SUBDIR+= execve extent getcwd ipf kqueue lock lockf pipe poll ras \
+SUBDIR+= execve extent getcwd kqueue lock lockf lwpctl pipe poll ras \
 	 sigtramp sleeping sysvmsg sysvsem sysvshm time ucontext umount \
 	 unfdpass writev
 

regress/sys/kern/lwpctl/Makefile

@@ -0,0 +1,11 @@
+#	$NetBSD: Makefile,v 1.1 2008/03/12 11:02:21 ad Exp $
+
+NOMAN=		# defined
+
+PROG=		lwpctl
+WARNS=		4
+
+regress:
+	@./${PROG}
+
+.include <bsd.prog.mk>

regress/sys/kern/lwpctl/lwpctl.c

@@ -0,0 +1,67 @@
+/*	$NetBSD: lwpctl.c,v 1.1 2008/03/12 11:02:21 ad 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the NetBSD
+ *	Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 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;
+}