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1 files changed, 107 insertions, 0 deletions

diff --git a/src/util/test_scheduler_delay.c b/src/util/test_scheduler_delay.c
new file mode 100644
index 000000000..76cbf94d8
--- /dev/null
+++ b/src/util/test_scheduler_delay.c
@@ -0,0 +1,107 @@
+/*
+     This file is part of GNUnet.
+     (C) 2001, 2002, 2003, 2004, 2006 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 2, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+/**
+ * @file util/test_scheduler_delay.c
+ * @brief testcase for delay of scheduler, measures how
+ *  precise the timers are.  Expect values between 10 and 20 ms on
+ *  modern machines.
+ */
+#include "platform.h"
+#include "gnunet_common.h"
+#include "gnunet_scheduler_lib.h"
+#include "gnunet_time_lib.h"
+
+#define VERBOSE GNUNET_NO
+
+static struct GNUNET_TIME_Absolute target;
+
+static int i;
+
+static unsigned long long cumDelta;
+
+#define INCR 47
+
+#define MAXV 1500
+
+/**
+ * Signature of the main function of a task.
+ *
+ * @param cls closure
+ * @param tc context
+ */
+static void
+test_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  struct GNUNET_TIME_Absolute now;
+
+  now = GNUNET_TIME_absolute_get ();
+  if (now.value > target.value)
+    cumDelta += (now.value - target.value);
+  else
+    cumDelta += (target.value - now.value);
+  target =
+    GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply
+                                      (GNUNET_TIME_UNIT_MILLISECONDS, i));
+  fprintf (stderr, ".");
+  if (i > MAXV)
+    {
+      fprintf (stderr, "\n");
+      return;
+    }
+  GNUNET_SCHEDULER_add_delayed (tc->sched,
+                                GNUNET_NO,
+                                GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+                                GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
+                                GNUNET_TIME_relative_multiply
+                                (GNUNET_TIME_UNIT_MILLISECONDS, i),
+                                &test_task, NULL);
+  i += INCR;
+}
+
+static int
+check ()
+{
+  target = GNUNET_TIME_absolute_get ();
+  GNUNET_SCHEDULER_run (&test_task, NULL);
+  FPRINTF (stdout,
+           "Sleep precision: %llu ms. ", cumDelta / 1000 / (MAXV / INCR));
+  if (cumDelta <= 10 * MAXV / INCR)
+    fprintf (stdout, "Timer precision is excellent.\n");
+  else if (cumDelta <= 50 * MAXV / INCR)        /* 50 ms average deviation */
+    fprintf (stdout, "Timer precision is good.\n");
+  else if (cumDelta > 250 * MAXV / INCR)
+    fprintf (stdout, "Timer precision is awful.\n");
+  else
+    fprintf (stdout, "Timer precision is acceptable.\n");
+  return 0;
+}
+
+int
+main (int argc, char *argv[])
+{
+  int ret;
+
+  GNUNET_log_setup ("test-scheduler-delay", "WARNING", NULL);
+  ret = check ();
+
+  return ret;
+}
+
+/* end of test_scheduler_delay.c */