inspiration/ETL/test/clock.cpp

/*! ========================================================================
** Extended Template and Library Test Suite
** Clock Test
**
** Copyright (c) 2002 Robert B. Quattlebaum Jr.
**
** This package 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 of
** the License, or (at your option) any later version.
**
** This package 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.
**
** === N O T E S ===========================================================
**
** ========================================================================= */

#include <ETL/clock>
#include <stdio.h>

using namespace etl;

int basic_test(void)
{
    int ret = 0;
    fprintf(stderr, "default etl::clock precision:  %0.8f\n", etl::clock::precision());
    fprintf(stderr, "realtime etl::clock precision: %0.8f\n", etl::clock_realtime::precision());
    fprintf(stderr, "proctime etl::clock precision: %0.8f\n", etl::clock_proctime::precision());

    etl::clock_realtime timer;
    etl::clock::value_type amount, total;

    for (amount = 3.0; amount >= 0.00015; amount /= 2.0) {
        if (amount * 1000000.0 < 1000.0f) {
            fprintf(stderr, "waiting %f microseconds...\n", amount * 1000000.0);
        } else if (amount * 1000.0 < 400.0f) {
            fprintf(stderr, "waiting %f milliseconds...\n", amount * 1000.0);
        } else {
            fprintf(stderr, "waiting %f seconds...\n", amount);
        }

        timer.reset();
        etl::clock::sleep(amount);
        total = timer();

        if ((total - amount) * 1000000.0 < 1000.0f) {
            fprintf(stderr, " ** I waited %f seconds, error of %f microseconds\n", total, (total - amount) * 1000000);
        } else if ((total - amount) * 1000.0 < 400.0f) {
            fprintf(stderr, " ** I waited %f seconds, error of %f milliseconds\n", total, (total - amount) * 1000);
        } else {
            fprintf(stderr, " ** I waited %f seconds, error of %f seconds\n", total, total - amount);
        }

    }

    return ret;
}

int main()
{
    int error = 0;

    error += basic_test();

    return error;
}