diff --git a/tools/regression/pthread/cv_cancel1/cv_cancel1.c b/tools/regression/pthread/cv_cancel1/cv_cancel1.c
index 140f55168dbb..fdc50a866411 100644
--- a/tools/regression/pthread/cv_cancel1/cv_cancel1.c
+++ b/tools/regression/pthread/cv_cancel1/cv_cancel1.c
@@ -1,86 +1,87 @@
 /*-
  * Copyright (c) 2006, David Xu <davidxu@freebsd.org>
  * 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 unmodified, 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 AUTHOR ``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 AUTHOR 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.
  *
  * $FreeBSD$
  *
  */
 #include <pthread.h>
 #include <stdio.h>
 #include <unistd.h>
 
 #define NLOOPS	10
 
 static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
 static pthread_cond_t cv = PTHREAD_COND_INITIALIZER;
 
 static int wake;
 static int stop;
 
 static void *
 thr_routine(void *arg __unused)
 {
 	pthread_mutex_lock(&m);
 	while (wake == 0)
 		pthread_cond_wait(&cv, &m);
 	pthread_mutex_unlock(&m);
 
 	while (stop == 0)
 		pthread_yield();
 	return (NULL);
 }
 
-int main(int argc __unused, char **argv __unused)
+int
+main(void)
 {
 	pthread_t td;
 	int i;
 	void *result;
 
 	pthread_setconcurrency(1);
 	for (i = 0; i < NLOOPS; ++i) {
 		stop = 0;
 		wake = 0;
 
 		pthread_create(&td, NULL, thr_routine, NULL);
 		sleep(1);
 		printf("trying: %d\n", i);
 		pthread_mutex_lock(&m);
 		wake = 1;
 		pthread_cond_signal(&cv);
 		pthread_cancel(td);
 		pthread_mutex_unlock(&m);
 		stop = 1;
 		result = NULL;
 		pthread_join(td, &result);
 		if (result == PTHREAD_CANCELED) {
 			printf("the condition variable implementation does not\n"
 			       "conform to SUSv3, a thread unblocked from\n"
 			       "condition variable still can be canceled.\n");
 			return (1);
 		}
 	}
 
 	printf("OK\n");
 	return (0);
 }
diff --git a/tools/regression/pthread/mutex_isowned_np/mutex_isowned_np.c b/tools/regression/pthread/mutex_isowned_np/mutex_isowned_np.c
index 9eefef84ecf0..381921c38a06 100644
--- a/tools/regression/pthread/mutex_isowned_np/mutex_isowned_np.c
+++ b/tools/regression/pthread/mutex_isowned_np/mutex_isowned_np.c
@@ -1,77 +1,77 @@
 /*-
  * Copyright (c) 2008 Dag-Erling Coïdan Smørgrav
  * 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
  *    in this position and unchanged.
  * 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 AUTHOR 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 AUTHOR 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.
  *
  * $FreeBSD$
  */
 
 #include <pthread.h>
 #include <pthread_np.h>
 #include <stdio.h>
 #include <stdlib.h>
 
 static void *
 thread(void *arg)
 {
 	pthread_mutex_t *mtx = arg;
 
 	if (pthread_mutex_isowned_np(mtx) != 0) {
 		printf("pthread_mutex_isowned_np() returned non-zero\n"
 		    "for a mutex held by another thread\n");
 		exit(1);
 	}
 	return (NULL);
 }
 
 int
-main(int argc __unused, char *argv[] __unused)
+main(void)
 {
 	pthread_t thr;
 	pthread_mutex_t mtx;
 
 	pthread_mutex_init(&mtx, NULL);
 	if (pthread_mutex_isowned_np(&mtx) != 0) {
 		printf("pthread_mutex_isowned_np() returned non-zero\n"
 		    "for a mutex that is not held\n");
 		exit(1);
 	}
 	pthread_mutex_lock(&mtx);
 	if (pthread_mutex_isowned_np(&mtx) == 0) {
 		printf("pthread_mutex_isowned_np() returned zero\n"
 		    "for a mutex we hold ourselves\n");
 		exit(1);
 	}
 	pthread_create(&thr, NULL, thread, &mtx);
 	pthread_join(thr, NULL);
 	pthread_mutex_unlock(&mtx);
 	if (pthread_mutex_isowned_np(&mtx) != 0) {
 		printf("pthread_mutex_isowned_np() returned non-zero\n"
 		    "for a mutex that is not held\n");
 		exit(1);
 	}
 
 	printf("OK\n");
 	exit(0);
 }