These are regression tests for the P1003.1B scheduler.

Approved by:	jkh

1 files changed, 227 insertions, 0 deletions

diff --git a/tools/regression/p1003_1b/fifo.c b/tools/regression/p1003_1b/fifo.c
new file mode 100644
index 000000000000..455f7f9adc5f
--- /dev/null
+++ b/tools/regression/p1003_1b/fifo.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright (c) 1996 - 2000
+ *	HD Associates, 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 HD Associates, Inc
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES 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 HD ASSOCIATES 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 <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <err.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/time.h>
+#include <sched.h>
+#include <signal.h>
+
+volatile int ticked;
+#define CAN_USE_ALARMS
+
+#ifdef CAN_USE_ALARMS
+void tick(int arg)
+{
+	ticked = 1;
+}
+#endif
+
+/* Fifo: Verify that fifo and round-robin scheduling seem to work.
+ *
+ * This tests:
+ * 1. That sched_rr_get_interval seems to work;
+ * 2. That FIFO scheduling doesn't seeem to be round-robin;
+ * 3. That round-robin scheduling seems to work.
+ * 
+ */
+static pid_t child;
+static void tidyup(void)
+{
+	if (child)
+		kill(child, SIGHUP);
+}
+
+static double
+tvsub(const struct timeval *a, const struct timeval *b)
+{
+	long sdiff;
+	long udiff;
+
+	sdiff = a->tv_sec - b->tv_sec;
+	udiff = a->tv_usec - b->tv_usec;
+
+	return (double)(sdiff * 1000000 + udiff) / 1e6;
+}
+
+int fifo(int argc, char *argv[])
+{
+	int e = 0;
+	volatile long *p, pid;
+	int i;
+	struct sched_param fifo_param;
+	struct timespec interval;
+#define MAX_RANAT 32
+	struct timeval ranat[MAX_RANAT];
+
+#ifdef CAN_USE_ALARMS
+	static struct itimerval itimerval;
+#endif
+
+	/* What is the round robin interval?
+	 */
+
+	if (sched_rr_get_interval(0, &interval) == -1) {
+		perror("sched_rr_get_interval");
+		exit(errno);
+	}
+
+#ifdef CAN_USE_ALARMS
+	signal(SIGALRM, tick);
+#endif
+
+	fifo_param.sched_priority = 1;
+
+	p = (long *)mmap(0, sizeof(*p),
+	PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED|MAP_INHERIT, -1, 0);
+
+	if (p == (long *)-1)
+		err(errno, "mmap");
+
+	*p = 0;
+
+	if (sched_setscheduler(0, SCHED_FIFO, &fifo_param) == -1)
+	{
+		perror("sched_setscheduler");
+		return -1;
+	}
+
+	pid = getpid();
+
+	if ((child = fork()) == 0)
+	{
+		/* Child process.  Just keep setting the pointer to our
+		 * PID.  The parent will kill us when it wants to.
+		 */
+
+		pid = getpid();
+		while (1)
+			*p = pid;
+	}
+	else
+	{
+		atexit(tidyup);
+		*p = pid;
+
+
+		ticked = 0;
+
+#ifdef CAN_USE_ALARMS
+		/* Set an alarm for 250 times the round-robin interval.
+		 * Then we will verify that a similar priority process
+		 * will not run when we are using the FIFO scheduler.
+		 */
+		itimerval.it_value.tv_usec = interval.tv_nsec / (1000 / 250);
+
+		itimerval.it_value.tv_sec = itimerval.it_value.tv_usec / 1000000;
+		itimerval.it_value.tv_usec %= 1000000;
+
+
+		if (setitimer(ITIMER_REAL, &itimerval, 0) == -1) {
+			perror("setitimer");
+			exit(errno);
+		}
+#endif
+
+
+		gettimeofday(ranat, 0);
+		i = 1;
+		while (!ticked && i < MAX_RANAT)
+			if (*p == child) {
+				gettimeofday(ranat + i, 0);
+				*p = 0;
+				e = -1;
+				i++;
+			}
+
+		if (e) {
+			int j;
+
+			fprintf(stderr,
+			"SCHED_FIFO had erroneous context switches:\n");
+			for (j = 1; j < i; j++) {
+				fprintf(stderr, "%d %g\n", j,
+					tvsub(ranat + j, ranat + j - 1));
+			}
+			return e;
+		}
+
+		/* Switch to the round robin scheduler and the child
+		 * should run within twice the interval.
+		 */
+		if (sched_setscheduler(child, SCHED_RR, &fifo_param) == -1 ||
+		sched_setscheduler(0, SCHED_RR, &fifo_param) == -1)
+		{
+			perror("sched_setscheduler");
+			return -1;
+		}
+
+		e = -1;
+
+		ticked = 0;
+
+#ifdef CAN_USE_ALARMS
+
+		/* Now we do want to see it run.  But only set
+		 * the alarm for twice the interval:
+		 */
+		itimerval.it_value.tv_usec = interval.tv_nsec / 500;
+
+		if (setitimer(ITIMER_REAL, &itimerval, 0) == -1) {
+			perror("setitimer");
+			exit(errno);
+		}
+#endif
+
+		for (i = 0; !ticked; i++)
+			if (*p == child) {
+				e = 0;
+				break;
+			}
+
+		if (e)
+			fprintf(stderr,"Child never ran when it should have.\n");
+	}
+
+	exit(e);
+}
+
+#ifdef STANDALONE_TESTS
+int main(int argc, char *argv[]) { return fifo(argc, argv); }
+#endif