flower/cpu-timer.cc

   1 /*
   2   cpu-timer.cc -- implement Cpu_timer
   3
   4   source file of the Flower Library
   5
   6   (c) 1997--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "cpu-timer.hh"
  10
  11 #include <unistd.h>
  12 // nextstep
  13 #ifndef CLOCKS_PER_SEC
  14 #ifdef CLK_TCK
  15 #define CLOCKS_PER_SEC CLK_TCK
  16 #elif defined _SC_CLK_TCK
  17 #define CLOCKS_PER_SEC sysconf (_SC_CLK_TCK)
  18 #else
  19 #error cannot determine CLOCKS_PER_SEC
  20 #endif
  21 #endif
  22
  23 Cpu_timer::Cpu_timer ()
  24 {
  25   restart ();
  26 }
  27 void
  28 Cpu_timer::restart ()
  29 {
  30   start_clock_ = clock ();
  31 }
  32
  33 Real
  34 Cpu_timer::read ()
  35 {
  36   clock_t stop = clock ();
  37   return (stop - start_clock_) / Real (CLOCKS_PER_SEC);
  38 }