src/timing/cl_t_current2.cc

   1 // cl_current_time_consumption().
   2
   3 // General includes.
   4 #include "cl_sysdep.h"
   5
   6 // Specification.
   7 #include "cl_timing.h"
   8
   9
  10 // Implementation.
  11
  12 #include "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 #ifdef HAVE_PERROR_DECL
  26   #include <errno.h>
  27   #include <stdio.h>
  28 #else
  29   extern "C" int perror (const char *);
  30 #endif
  31
  32 const cl_time_consumption cl_current_time_consumption ()
  33 {
  34         var cl_time_consumption result;
  35
  36         var cl_timespec time = cl_current_time();
  37         result.realtime.tv_sec  = time.tv_sec;
  38         result.realtime.tv_nsec = time.tv_nsec;
  39
  40 #if defined(HAVE_GETRUSAGE)
  41         var struct rusage usage;
  42         if (getrusage(RUSAGE_SELF,&usage) == 0) {
  43                 // use ru_utime only, ignore ru_stime.
  44                 result.usertime.tv_sec  = usage.ru_utime.tv_sec;
  45                 result.usertime.tv_nsec = usage.ru_utime.tv_usec * (1000000000/1000000);
  46         } else {
  47                 perror("getrusage");
  48                 result.usertime.tv_sec = 0; result.usertime.tv_nsec = 0;
  49         }
  50 #elif defined(HAVE_SYS_TIMES_H)
  51         var struct tms usage;
  52         if (times(&usage) != (clock_t)(-1)) {
  53                 // use tms_utime only, ignore tms_stime.
  54                 var uintL used_time = usage.tms_utime;
  55                 result.usertime.tv_sec  = used_time / HZ;
  56                 result.usertime.tv_nsec = (used_time % HZ) * ((2*1000000000+HZ)/(2*HZ));
  57         } else {
  58                 // ignore error ??
  59                 result.usertime.tv_sec = 0; result.usertime.tv_nsec = 0;
  60         }
  61 #else
  62         result.usertime = result.realtime;
  63 #endif
  64
  65         return result;
  66 }