253 строки
9.6 KiB
C++
253 строки
9.6 KiB
C++
/*---------------------------------------------------------------
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* Copyright (c) 1999,2000,2001,2002,2003
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* The Board of Trustees of the University of Illinois
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* All Rights Reserved.
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*---------------------------------------------------------------
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software (Iperf) and associated
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* documentation files (the "Software"), to deal in the Software
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* without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute,
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* sublicense, and/or sell copies of the Software, and to permit
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* persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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*
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* Redistributions of source code must retain the above
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* copyright notice, this list of conditions and
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* the following disclaimers.
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*
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimers in the documentation and/or other materials
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* provided with the distribution.
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*
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*
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* Neither the names of the University of Illinois, NCSA,
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* nor the names of its contributors may be used to endorse
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* or promote products derived from this Software without
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* specific prior written permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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* ________________________________________________________________
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* National Laboratory for Applied Network Research
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* National Center for Supercomputing Applications
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* University of Illinois at Urbana-Champaign
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* http://www.ncsa.uiuc.edu
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* ________________________________________________________________
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*
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* Timestamp.hpp
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* by Mark Gates <mgates@nlanr.net>
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* -------------------------------------------------------------------
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* A generic interface to a timestamp.
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* This implementation uses the unix gettimeofday().
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* -------------------------------------------------------------------
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* headers
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* uses
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* <sys/types.h>
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* <sys/time.h>
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* <unistd.h>
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* ------------------------------------------------------------------- */
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#ifndef TIMESTAMP_H
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#define TIMESTAMP_H
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#include "headers.h"
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/* ------------------------------------------------------------------- */
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class Timestamp {
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public:
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/* -------------------------------------------------------------------
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* Create a timestamp, with the current time in it.
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* ------------------------------------------------------------------- */
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Timestamp( void ) {
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setnow();
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}
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/* -------------------------------------------------------------------
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* Create a timestamp, with the given seconds/microseconds
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* ------------------------------------------------------------------- */
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Timestamp( long sec, long usec ) {
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set( sec, usec );
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}
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/* -------------------------------------------------------------------
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* Create a timestamp, with the given seconds
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* ------------------------------------------------------------------- */
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Timestamp( double sec ) {
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set( sec );
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}
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/* -------------------------------------------------------------------
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* Set timestamp to current time.
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* ------------------------------------------------------------------- */
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void setnow( void ) {
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gettimeofday( &mTime, NULL );
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}
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/* -------------------------------------------------------------------
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* Set timestamp to the given seconds/microseconds
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* ------------------------------------------------------------------- */
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void set( long sec, long usec ) {
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assert( sec >= 0 );
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assert( usec >= 0 && usec < kMillion );
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mTime.tv_sec = sec;
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mTime.tv_usec = usec;
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}
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/* -------------------------------------------------------------------
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* Set timestamp to the given seconds
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* ------------------------------------------------------------------- */
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void set( double sec ) {
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mTime.tv_sec = (long) sec;
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mTime.tv_usec = (long) ((sec - mTime.tv_sec) * kMillion);
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}
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/* -------------------------------------------------------------------
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* return seconds portion of timestamp
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* ------------------------------------------------------------------- */
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long getSecs( void ) {
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return mTime.tv_sec;
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}
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/* -------------------------------------------------------------------
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* return microseconds portion of timestamp
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* ------------------------------------------------------------------- */
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long getUsecs( void ) {
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return mTime.tv_usec;
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}
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/* -------------------------------------------------------------------
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* return timestamp as a floating point seconds
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* ------------------------------------------------------------------- */
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double get( void ) {
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return mTime.tv_sec + mTime.tv_usec / ((double) kMillion);
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}
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/* -------------------------------------------------------------------
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* subtract the right timestamp from my timestamp.
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* return the difference in microseconds.
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* ------------------------------------------------------------------- */
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long subUsec( Timestamp right ) {
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return(mTime.tv_sec - right.mTime.tv_sec) * kMillion +
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(mTime.tv_usec - right.mTime.tv_usec);
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}
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/* -------------------------------------------------------------------
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* subtract the right timestamp from my timestamp.
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* return the difference in microseconds.
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* ------------------------------------------------------------------- */
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long subUsec( timeval right ) {
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return(mTime.tv_sec - right.tv_sec) * kMillion +
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(mTime.tv_usec - right.tv_usec);
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}
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/* -------------------------------------------------------------------
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* subtract the right timestamp from my timestamp.
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* return the difference in seconds as a floating point.
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* ------------------------------------------------------------------- */
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double subSec( Timestamp right ) {
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return(mTime.tv_sec - right.mTime.tv_sec) +
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(mTime.tv_usec - right.mTime.tv_usec) / ((double) kMillion);
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}
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/* -------------------------------------------------------------------
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* add the right timestamp to my timestamp.
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* ------------------------------------------------------------------- */
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void add( Timestamp right ) {
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mTime.tv_sec += right.mTime.tv_sec;
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mTime.tv_usec += right.mTime.tv_usec;
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// watch for under- and overflow
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if ( mTime.tv_usec < 0 ) {
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mTime.tv_usec += kMillion;
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mTime.tv_sec--;
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}
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if ( mTime.tv_usec >= kMillion ) {
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mTime.tv_usec -= kMillion;
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mTime.tv_sec++;
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}
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assert( mTime.tv_usec >= 0 &&
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mTime.tv_usec < kMillion );
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}
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/* -------------------------------------------------------------------
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* add the seconds to my timestamp.
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* TODO optimize?
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* ------------------------------------------------------------------- */
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void add( double sec ) {
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mTime.tv_sec += (long) sec;
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mTime.tv_usec += (long) ((sec - ((long) sec )) * kMillion);
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// watch for overflow
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if ( mTime.tv_usec >= kMillion ) {
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mTime.tv_usec -= kMillion;
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mTime.tv_sec++;
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}
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assert( mTime.tv_usec >= 0 &&
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mTime.tv_usec < kMillion );
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}
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/* -------------------------------------------------------------------
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* return true if my timestamp is before the right timestamp.
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* ------------------------------------------------------------------- */
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bool before( Timestamp right ) {
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return mTime.tv_sec < right.mTime.tv_sec ||
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(mTime.tv_sec == right.mTime.tv_sec &&
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mTime.tv_usec < right.mTime.tv_usec);
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}
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/* -------------------------------------------------------------------
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* return true if my timestamp is before the right timestamp.
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* ------------------------------------------------------------------- */
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bool before( timeval right ) {
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return mTime.tv_sec < right.tv_sec ||
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(mTime.tv_sec == right.tv_sec &&
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mTime.tv_usec < right.tv_usec);
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}
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/* -------------------------------------------------------------------
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* return true if my timestamp is after the right timestamp.
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* ------------------------------------------------------------------- */
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bool after( Timestamp right ) {
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return mTime.tv_sec > right.mTime.tv_sec ||
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(mTime.tv_sec == right.mTime.tv_sec &&
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mTime.tv_usec > right.mTime.tv_usec);
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}
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/**
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* This function returns the fraction of time elapsed after the beginning
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* till the end
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*/
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double fraction(Timestamp currentTime, Timestamp endTime) {
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if ( (currentTime.after(*this)) && (endTime.after(currentTime)) ) {
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return(((double)currentTime.subUsec(*this)) /
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((double)endTime.subUsec(*this)));
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} else {
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return -1.0;
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}
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}
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protected:
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enum {
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kMillion = 1000000
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};
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struct timeval mTime;
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}; // end class Timestamp
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#endif // TIMESTAMP_H
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