[app][test] some benchmarks and a quick clock tester

app/tests/clock_tests.c

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2012 Travis Geiselbrecht
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include <debug.h>
+#include <rand.h>
+#include <err.h>
+#include <app/tests.h>
+#include <kernel/thread.h>
+#include <kernel/mutex.h>
+#include <kernel/semaphore.h>
+#include <kernel/event.h>
+#include <platform.h>
+
+void clock_tests(void)
+{
+	printf("counting to 5, in one second intervals\n");
+	for (int i = 0; i < 5; i++) {
+		thread_sleep(1000);
+		printf("%d\n", i + 1);
+	}
+
+	printf("measuring cpu clock against time\n");
+	for (int i = 0; i < 5; i++) {
+		uint cycles = arch_cycle_count();
+		spin(1000000);
+		cycles = arch_cycle_count() - cycles;
+		printf("%u cycles per second\n", cycles);
+	}
+}
+