src/timing/cl_t_current2.cc

   1 // cl_current_time_consumption().
   2
   3 // General includes.
   4 #include "base/cl_sysdep.h"
   5
   6 // Specification.
   7 #include "cln/timing.h"
   8
   9
  10 // Implementation.
  11
  12 #include "timing/cl_t_config.h"
  13
  14 #if defined(HAVE_GETRUSAGE)
  15   #include <sys/types.h>
  16   #include <sys/time.h>
  17   #include <sys/resource.h>
  18   extern "C" int getrusage (RUSAGE_WHO_T who, struct rusage * rusage);
  19 #elif defined(HAVE_SYS_TIMES_H)
  20   #include <sys/types.h>
  21   #include <sys/param.h> // defines HZ, unit for times() is 1/HZ seconds
  22   #include <sys/times.h>
  23   extern "C" clock_t times (struct tms * buffer);
  24 #endif
  25 #include <cerrno>
  26 #include <cstdio>
  27
  28 namespace cln {
  29
  30 const cl_time_consumption cl_current_time_consumption ()
  31 {
  32         var cl_time_consumption result;
  33
  34         var cl_timespec time = cl_current_time();
  35         result.realtime.tv_sec  = time.tv_sec;
  36         result.realtime.tv_nsec = time.tv_nsec;
  37
  38 #if defined(HAVE_GETRUSAGE)
  39         var struct rusage usage;
  40         if (getrusage(RUSAGE_SELF,&usage) == 0) {
  41                 // use ru_utime only, ignore ru_stime.
  42                 result.usertime.tv_sec  = usage.ru_utime.tv_sec;
  43                 result.usertime.tv_nsec = usage.ru_utime.tv_usec * (1000000000/1000000);
  44         } else {
  45                 perror("getrusage");
  46                 result.usertime.tv_sec = 0; result.usertime.tv_nsec = 0;
  47         }
  48 #elif defined(HAVE_SYS_TIMES_H)
  49         var struct tms usage;
  50         if (times(&usage) != (clock_t)(-1)) {
  51                 // use tms_utime only, ignore tms_stime.
  52                 var uintL used_time = usage.tms_utime;
  53                 result.usertime.tv_sec  = used_time / HZ;
  54                 result.usertime.tv_nsec = (used_time % HZ) * ((2*1000000000+HZ)/(2*HZ));
  55         } else {
  56                 // ignore error ??
  57                 result.usertime.tv_sec = 0; result.usertime.tv_nsec = 0;
  58         }
  59 #else
  60         result.usertime = result.realtime;
  61 #endif
  62
  63         return result;
  64 }
  65
  66 }  // namespace cln