00001 /* 00002 * IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. By 00003 * downloading, copying, installing or using the software you agree to 00004 * this license. If you do not agree to this license, do not download, 00005 * install, copy or use the software. 00006 * 00007 * Intel Open Source License 00008 * 00009 * Copyright (c) 2004 Intel Corporation. All rights reserved. 00010 * 00011 * Redistribution and use in source and binary forms, with or without 00012 * modification, are permitted provided that the following conditions are 00013 * met: 00014 * 00015 * Redistributions of source code must retain the above copyright 00016 * notice, this list of conditions and the following disclaimer. 00017 * 00018 * Redistributions in binary form must reproduce the above copyright 00019 * notice, this list of conditions and the following disclaimer in the 00020 * documentation and/or other materials provided with the distribution. 00021 * 00022 * Neither the name of the Intel Corporation nor the names of its 00023 * contributors may be used to endorse or promote products derived from 00024 * this software without specific prior written permission. 00025 * 00026 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00027 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00028 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00029 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE INTEL OR 00030 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00031 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00032 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00033 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00034 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00035 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00036 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00037 */ 00038 00039 #include "RateEstimator.h" 00040 00041 namespace oasys { 00042 00043 RateEstimator::RateEstimator(int *var, int interval, double weight) 00044 { 00045 var_ = var; 00046 weight_ = weight; 00047 lastval_ = 0; 00048 rate_ = 0.0; 00049 lastts_.tv_sec = 0; 00050 lastts_.tv_usec = 0; 00051 00052 schedule_in(interval); 00053 } 00054 00055 void 00056 RateEstimator::timeout(struct timeval* now) 00057 { 00058 if (lastts_.tv_sec == 0 && lastts_.tv_usec == 0) { 00059 // first time through 00060 rate_ = 0.0; 00061 done: 00062 lastval_ = *var_; 00063 lastts_ = *now; 00064 schedule_in(interval_); 00065 return; 00066 } 00067 00068 double dv = (double)(*var_ - lastval_); 00069 double dt = TIMEVAL_DIFF_DOUBLE(*now, lastts_); 00070 00071 double newrate = dv/dt; 00072 double oldrate = rate_; 00073 double delta = newrate - oldrate; 00074 00075 rate_ += delta * weight_; 00076 00077 goto done; 00078 } 00079 00080 } // namespace oasys