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+/*
+ * Copyright (c) 2015 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ Copyright (c) 2005 Eliot Dresselhaus
+
+ 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 <vppinfra/format.h>
+#include <vppinfra/time.h>
+#include <vppinfra/math.h> /* for sqrt */
+
+static int verbose;
+#define if_verbose(format,args...) \
+ if (verbose) { clib_warning(format, ## args); }
+
+static int
+test_time_main (unformat_input_t * input)
+{
+ f64 wait, error;
+ f64 t, tu[3], ave, rms;
+ clib_time_t c;
+ int i, n, j;
+
+ clib_time_init (&c);
+ wait = 1e-3;
+ n = 1000;
+ unformat (input, "%f %d", &wait, &n);
+ ave = rms = 0;
+ tu[0] = unix_time_now ();
+ tu[1] = unix_time_now ();
+ for (i = 0; i < n; i++)
+ {
+ j = 0;
+ t = clib_time_now (&c);
+ while (clib_time_now (&c) < t + wait)
+ j++;
+ t = j;
+ ave += t;
+ rms += t * t;
+ }
+ tu[2] = unix_time_now ();
+ ave /= n;
+ rms = sqrt (rms / n - ave * ave);
+
+ error = ((tu[2] - tu[1]) - 2 * (tu[1] - tu[0]) - n * wait) / n;
+ if_verbose ("tested %d x %.6e sec waits, error %.6e loops %.6e +- %.6e\n",
+ n, wait, error, ave, rms);
+
+ return 0;
+}
+
+#ifdef CLIB_UNIX
+int
+main (int argc, char *argv[])
+{
+ unformat_input_t i;
+ int ret;
+
+ verbose = (argc > 1);
+ unformat_init_command_line (&i, argv);
+ ret = test_time_main (&i);
+ unformat_free (&i);
+
+ return ret;
+}
+#endif /* CLIB_UNIX */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */