OPeNDAP Hyrax Back End Server (BES)
Updated for version 3.8.3
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00001 // BESStopWatch.cc 00002 00003 // This file is part of bes, A C++ back-end server implementation framework 00004 // for the OPeNDAP Data Access Protocol. 00005 00006 // Copyright (c) 2004-2009 University Corporation for Atmospheric Research 00007 // Author: Patrick West <pwest@ucar.edu> and Jose Garcia <jgarcia@ucar.edu> 00008 // 00009 // This library is free software; you can redistribute it and/or 00010 // modify it under the terms of the GNU Lesser General Public 00011 // License as published by the Free Software Foundation; either 00012 // version 2.1 of the License, or (at your option) any later version. 00013 // 00014 // This library is distributed in the hope that it will be useful, 00015 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00017 // Lesser General Public License for more details. 00018 // 00019 // You should have received a copy of the GNU Lesser General Public 00020 // License along with this library; if not, write to the Free Software 00021 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00022 // 00023 // You can contact University Corporation for Atmospheric Research at 00024 // 3080 Center Green Drive, Boulder, CO 80301 00025 00026 // (c) COPYRIGHT University Corporation for Atmospheric Research 2004-2005 00027 // Please read the full copyright statement in the file COPYRIGHT_UCAR. 00028 // 00029 // Authors: 00030 // pwest Patrick West <pwest@ucar.edu> 00031 // jgarcia Jose Garcia <jgarcia@ucar.edu> 00032 00033 #include <cerrno> 00034 #include <string> 00035 #include <iostream> 00036 #include <cstring> 00037 00038 using std::string ; 00039 using std::endl ; 00040 00041 #include "BESStopWatch.h" 00042 #include "BESDebug.h" 00043 00044 bool 00045 BESStopWatch::start() 00046 { 00047 // get timer for current usage 00048 if( getrusage( RUSAGE_SELF, &_start_usage ) != 0 ) 00049 { 00050 int myerrno = errno ; 00051 char *c_err = strerror( myerrno ) ; 00052 string err = "getrusage failed in start: " ; 00053 if( c_err ) 00054 { 00055 err += c_err ; 00056 } 00057 else 00058 { 00059 err += "unknown error" ; 00060 } 00061 BESDEBUG( "timing", err ) ; 00062 _started = false ; 00063 } 00064 else 00065 { 00066 _started = true ; 00067 } 00068 00069 // either we started the stop watch, or failed to start it. Either way, 00070 // no timings are available, so set stopped to false. 00071 _stopped = false ; 00072 00073 return _started ; 00074 } 00075 00076 bool 00077 BESStopWatch::stop() 00078 { 00079 // if we have started, the we can stop. Otherwise just fall through. 00080 if( _started ) 00081 { 00082 // get timer for current usage 00083 if( getrusage( RUSAGE_SELF, &_stop_usage ) != 0 ) 00084 { 00085 int myerrno = errno ; 00086 char *c_err = strerror( myerrno ) ; 00087 string err = "getrusage failed in stop: " ; 00088 if( c_err ) 00089 { 00090 err += c_err ; 00091 } 00092 else 00093 { 00094 err += "unknown error" ; 00095 } 00096 BESDEBUG( "timing", err ) ; 00097 _started = false ; 00098 _stopped = false ; 00099 } 00100 else 00101 { 00102 // get the difference between the _start_usage and the 00103 // _stop_usage and save the difference. 00104 bool success = timeval_subtract() ; 00105 if( !success ) 00106 { 00107 BESDEBUG( "timing", "failed to get timing" ) ; 00108 _started = false ; 00109 _stopped = false ; 00110 } 00111 else 00112 { 00113 _stopped = true ; 00114 } 00115 } 00116 } 00117 00118 return _stopped ; 00119 } 00120 00121 bool 00122 BESStopWatch::timeval_subtract() 00123 { 00124 struct timeval &start = _start_usage.ru_utime ; 00125 struct timeval &stop = _stop_usage.ru_utime ; 00126 00127 /* Perform the carry for the later subtraction by updating y. */ 00128 if( stop.tv_usec < start.tv_usec ) 00129 { 00130 int nsec = (start.tv_usec - stop.tv_usec) / 1000000 + 1 ; 00131 start.tv_usec -= 1000000 * nsec ; 00132 start.tv_sec += nsec ; 00133 } 00134 if( stop.tv_usec - start.tv_usec > 1000000 ) 00135 { 00136 int nsec = (start.tv_usec - stop.tv_usec) / 1000000 ; 00137 start.tv_usec += 1000000 * nsec ; 00138 start.tv_sec -= nsec ; 00139 } 00140 00141 /* Compute the time remaining to wait. 00142 tv_usec is certainly positive. */ 00143 _result.tv_sec = stop.tv_sec - start.tv_sec ; 00144 _result.tv_usec = stop.tv_usec - start.tv_usec ; 00145 00146 /* Return 1 if result is negative. */ 00147 return !(stop.tv_sec < start.tv_sec) ; 00148 } 00149 00156 void 00157 BESStopWatch::dump( ostream &strm ) const 00158 { 00159 strm << BESIndent::LMarg << "BESStopWatch::dump - (" 00160 << (void *)this << ")" << endl ; 00161 } 00162