2025-04-24 Fred Gleason <fredg@paravelsystems.com>

* Added a 'RDTimeArray' class for optimization and debugging. Signed-off-by: Fred Gleason <fredg@paravelsystems.com>
2025-12-01 22:30:13 +01:00 · 2025-04-24 16:29:39 -04:00
parent c4b781ce8e
commit 79518592e4
6 changed files with 205 additions and 3 deletions
--- a/lib/rdtimearray.cpp
+++ b/lib/rdtimearray.cpp
@@ -0,0 +1,129 @@
+// rdtimearray.cpp
+//
+// Record a sequence of precise points in time with microsecond precision.
+//
+//   (C) Copyright 2025 Fred Gleason <fredg@paravelsystems.com>
+//
+//   This program is free software; you can redistribute it and/or modify
+//   it under the terms of the GNU General Public License version 2 as
+//   published by the Free Software Foundation.
+//
+//   This program 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.
+//
+//   You should have received a copy of the GNU General Public
+//   License along with this program; if not, write to the Free Software
+//   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+#include <sys/time.h>
+
+#include <QObject>
+
+#include "rdtimearray.h"
+
+RDTimePoint::RDTimePoint(const QString &label)
+{
+  struct timeval tv;
+
+  gettimeofday(&tv,NULL);
+  d_label=label;
+  d_usecs=1000000*tv.tv_sec+tv.tv_usec;
+}
+
+  
+QString RDTimePoint::label() const
+{
+  return d_label;
+}
+
+
+int64_t RDTimePoint::usecs() const
+{
+  return d_usecs;
+}
+
+
+QString RDTimePoint::toString() const
+{
+  return QString::asprintf("%s: %ld",d_label.toUtf8().constData(),d_usecs);
+}
+
+
+int64_t RDTimePoint::operator-(const RDTimePoint &rhs) const
+{
+  return d_usecs-rhs.d_usecs;
+}
+
+
+
+
+RDTimeArray::RDTimeArray()
+{
+}
+
+
+int RDTimeArray::size() const
+{
+  return d_points.size();
+}
+
+
+RDTimePoint RDTimeArray::timePoint(int n) const
+{
+  return d_points.at(n);
+}
+
+
+void RDTimeArray::addPoint(QString label)
+{
+  if(label.isEmpty()) {
+    label=QObject::tr("point")+QString::asprintf(" %d",d_points.size());
+  }
+  d_points.push_back(RDTimePoint(label));
+}
+
+
+QString RDTimeArray::toString(int from,int to) const
+{
+  QString ret;
+  
+  if(to<0) {
+    to=d_points.size()-1;
+  }
+  for(int i=from;i<(to+1);i++) {
+    ret+=QString::asprintf("%s: %ld\n",
+			   d_points.at(i).label().toUtf8().constData(),
+			   d_points.at(i).usecs());
+  }
+  return ret;
+}
+
+
+QString RDTimeArray::offsetsToString(int from,int to) const
+{
+  QString ret;
+  
+  if(to<0) {
+    to=d_points.size()-1;
+  }
+  for(int i=from;i<(to+1);i++) {
+    ret+=QString::asprintf("%s - %s: %ld\n",
+			   d_points.at(i).label().toUtf8().constData(),
+			   d_points.at(i-1).label().toUtf8().constData(),
+			   d_points.at(i)-d_points.at(i-1));
+  }
+  return ret;
+
+}
+
+
+int64_t RDTimeArray::usecsElapsed(int from,int to) const
+{
+  if(to<0) {
+    to=d_points.size()-1;
+  }
+  return d_points.at(to)-d_points.at(from);
+}