flower/cpu-timer.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "cpu-timer.hh"
  21
  22 #include <unistd.h>
  23 // nextstep
  24 #ifndef CLOCKS_PER_SEC
  25 #ifdef CLK_TCK
  26 #define CLOCKS_PER_SEC CLK_TCK
  27 #elif defined _SC_CLK_TCK
  28 #define CLOCKS_PER_SEC sysconf (_SC_CLK_TCK)
  29 #else
  30 #error cannot determine CLOCKS_PER_SEC
  31 #endif
  32 #endif
  33
  34 Cpu_timer::Cpu_timer ()
  35 {
  36   restart ();
  37 }
  38 void
  39 Cpu_timer::restart ()
  40 {
  41   start_clock_ = clock ();
  42 }
  43
  44 Real
  45 Cpu_timer::read ()
  46 {
  47   clock_t stop = clock ();
  48   return (stop - start_clock_) / Real (CLOCKS_PER_SEC);
  49 }