Move things round a bit.

[dcpomatic.git] / src / lib / timer.cc

diff --git a/src/lib/timer.cc b/src/lib/timer.cc
new file mode 100644 (file)
index 0000000..a45e80d
--- /dev/null
+++ b/src/lib/timer.cc
@@ -0,0 +1,89 @@
+/*
+    Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
+
+    This program 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 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.
+
+*/
+
+/** @file src/timer.cc
+ *  @brief Some timing classes for debugging and profiling.
+ */
+
+#include <iostream>
+#include <sys/time.h>
+#include "timer.h"
+#include "util.h"
+
+using namespace std;
+
+/** @param n Name to use when giving output */
+PeriodTimer::PeriodTimer (string n)
+       : _name (n)
+{
+       gettimeofday (&_start, 0);
+}
+
+/** Destroy PeriodTimer and output the time elapsed since its construction */
+PeriodTimer::~PeriodTimer ()
+{
+       struct timeval stop;
+       gettimeofday (&stop, 0);
+       cout << "T: " << _name << ": " << (seconds (stop) - seconds (_start)) << "\n";
+}
+
+/** @param n Name to use when giving output.
+ *  @param s Initial state.
+ */
+StateTimer::StateTimer (string n, string s)
+       : _name (n)
+{
+       struct timeval t;
+       gettimeofday (&t, 0);
+       _time = seconds (t);
+       _state = s;
+}
+
+/** @param s New state that the caller is in */
+void
+StateTimer::set_state (string s)
+{
+       double const last = _time;
+       struct timeval t;
+       gettimeofday (&t, 0);
+       _time = seconds (t);
+
+       if (_totals.find (s) == _totals.end ()) {
+               _totals[s] = 0;
+       }
+
+       _totals[_state] += _time - last;
+       _state = s;
+}
+
+/** Destroy StateTimer and generate a summary of the state timings on cout */
+StateTimer::~StateTimer ()
+{
+       if (_state.empty ()) {
+               return;
+       }
+
+       
+       set_state ("");
+
+       cout << _name << ":\n";
+       for (map<string, double>::iterator i = _totals.begin(); i != _totals.end(); ++i) {
+               cout << "\t" << i->first << " " << i->second << "\n";
+       }
+}