gdbsupport/run-time-clock.cc

   1 /* User/system CPU time clocks that follow the std::chrono interface.
   2    Copyright (C) 2016-2024 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program 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    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "run-time-clock.h"
  20 #if defined HAVE_SYS_RESOURCE_H
  21 #include <sys/resource.h>
  22 #endif
  23
  24 using namespace std::chrono;
  25
  26 run_time_clock::time_point
  27 run_time_clock::now () noexcept
  28 {
  29   return time_point (microseconds (get_run_time ()));
  30 }
  31
  32 #ifdef HAVE_GETRUSAGE
  33 static std::chrono::microseconds
  34 timeval_to_microseconds (struct timeval *tv)
  35 {
  36   return (seconds (tv->tv_sec) + microseconds (tv->tv_usec));
  37 }
  38 #endif
  39
  40 void
  41 run_time_clock::now (user_cpu_time_clock::time_point &user,
  42                      system_cpu_time_clock::time_point &system) noexcept
  43 {
  44 #ifdef HAVE_GETRUSAGE
  45   struct rusage rusage;
  46
  47   getrusage (RUSAGE_SELF, &rusage);
  48
  49   microseconds utime = timeval_to_microseconds (&rusage.ru_utime);
  50   microseconds stime = timeval_to_microseconds (&rusage.ru_stime);
  51   user = user_cpu_time_clock::time_point (utime);
  52   system = system_cpu_time_clock::time_point (stime);
  53 #else
  54   user = user_cpu_time_clock::time_point (microseconds (get_run_time ()));
  55   system = system_cpu_time_clock::time_point (microseconds::zero ());
  56 #endif
  57 }