gdbsupport/run-time-clock.cc

   1 /* User/system CPU time clocks that follow the std::chrono interface.
   2    Copyright (C) 2016-2020 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 "common-defs.h"
  20 #include "run-time-clock.h"
  21 #if defined HAVE_SYS_RESOURCE_H
  22 #include <sys/resource.h>
  23 #endif
  24
  25 using namespace std::chrono;
  26
  27 run_time_clock::time_point
  28 run_time_clock::now () noexcept
  29 {
  30   return time_point (microseconds (get_run_time ()));
  31 }
  32
  33 #ifdef HAVE_GETRUSAGE
  34 static std::chrono::microseconds
  35 timeval_to_microseconds (struct timeval *tv)
  36 {
  37   return (seconds (tv->tv_sec) + microseconds (tv->tv_usec));
  38 }
  39 #endif
  40
  41 void
  42 run_time_clock::now (user_cpu_time_clock::time_point &user,
  43                      system_cpu_time_clock::time_point &system) noexcept
  44 {
  45 #ifdef HAVE_GETRUSAGE
  46   struct rusage rusage;
  47
  48   getrusage (RUSAGE_SELF, &rusage);
  49
  50   microseconds utime = timeval_to_microseconds (&rusage.ru_utime);
  51   microseconds stime = timeval_to_microseconds (&rusage.ru_stime);
  52   user = user_cpu_time_clock::time_point (utime);
  53   system = system_cpu_time_clock::time_point (stime);
  54 #else
  55   user = user_cpu_time_clock::time_point (microseconds (get_run_time ()));
  56   system = system_cpu_time_clock::time_point (microseconds::zero ());
  57 #endif
  58 }