gprofng/testsuite/gprofng.display/synprog/so_syn.c

   1 /* Copyright (C) 2021-2024 Free Software Foundation, Inc.
   2    Contributed by Oracle.
   3
   4    This file is part of GNU Binutils.
   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, or (at your option)
   9    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, write to the Free Software
  18    Foundation, 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include "stopwatch.h"
  24
  25 static void so_burncpu ();
  26
  27 int
  28 so_cputime ()
  29 {
  30   wlog ("start of so_cputime", NULL);
  31
  32   /* put a memory leak in here */
  33   (void) malloc (13);
  34
  35   fprintf (stderr, "so_burncpu @ %p\n", so_burncpu);
  36   so_burncpu ();
  37
  38   wlog ("end of so_cputime", NULL);
  39   return 13;
  40 }
  41
  42 void so_init () __attribute__ ((constructor));
  43
  44 void
  45 so_init ()
  46 {
  47   fprintf (stderr, "so_init executed\n");
  48 }
  49
  50 /*      so_burncpu - loop to use a bunch of user time */
  51 void
  52 so_burncpu ()
  53 {
  54   hrtime_t start = gethrtime ();
  55   hrtime_t vstart = gethrvtime ();
  56   volatile float x = 0.;     /* temp variable for f.p. calculation */
  57   long long count = 0;
  58   do
  59     {
  60       x = 0.0;
  61       for (int j = 0; j < 100000; j++)
  62         x = x + 1.0;
  63       count++;
  64     }
  65   while (start + testtime * 1e9 > gethrtime ());
  66
  67   fprintf (stderr, "   Performed %lld while-loop iterations\n", count);
  68   whrvlog (gethrtime () - start, gethrvtime () - vstart, "so_burncpu", NULL);
  69 }