lib-src/profile.c

   1 /* profile.c --- generate periodic events for profiling of Emacs Lisp code.
   2  Copyright (C) 1992, 1994 Free Software Foundation, Inc.
   3
   4  Author: Boaz Ben-Zvi <boaz@lcs.mit.edu>
   5
   6  This file is part of GNU Emacs.
   7
   8  GNU Emacs is free software; you can redistribute it and/or modify
   9  it under the terms of the GNU General Public License as published by
  10  the Free Software Foundation; either version 2, or (at your option)
  11  any later version.
  12
  13  GNU Emacs is distributed in the hope that it will be useful,
  14  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  GNU General Public License for more details.
  17
  18  You should have received a copy of the GNU General Public License
  19  along with GNU Emacs; see the file COPYING.  If not, write to
  20  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  21
  22
  23 /**
  24  **  To be run as an emacs process. Input string that starts with:
  25  **    'z' -- resets the watch (to zero).
  26  **    'p' -- return time (on stdout) as string with format <sec>.<micro-sec>
  27  **    'q' -- exit.
  28  **
  29  **  abstraction : a stopwatch
  30  **  operations: reset_watch, get_time
  31  */
  32 #include <stdio.h>
  33 #include <../src/config.h>
  34 #include <../src/systime.h>
  35
  36 static struct timeval TV1, TV2;
  37 static struct timezone *tzp = (struct timezone *) NULL; /* no need timezone */
  38 static int watch_not_started = 1; /* flag */
  39 static char time_string[30];
  40
  41 /* Reset the stopwatch to zero.  */
  42
  43 int
  44 reset_watch ()
  45 {
  46   gettimeofday (&TV1, tzp);
  47   watch_not_started = 0;
  48 }
  49
  50 /* This call returns the time since the last reset_watch call.  The time
  51    is returned as a string with the format  <seconds>.<micro-seconds>
  52    If reset_watch was not called yet, exit.  */
  53
  54 char *
  55 get_time ()
  56 {
  57   if (watch_not_started)
  58     exit (1);  /* call reset_watch first ! */
  59   gettimeofday (&TV2, tzp);
  60   if (TV1.tv_usec > TV2.tv_usec)
  61     {
  62       TV2.tv_usec += 1000000;
  63       TV2.tv_sec--;
  64     }
  65   sprintf (time_string, "%lu.%06lu",
  66           TV2.tv_sec - TV1.tv_sec, TV2.tv_usec - TV1.tv_usec);
  67   return time_string;
  68 }
  69
  70 void
  71 main ()
  72 {
  73   int c;
  74   while ((c = getchar ()) != EOF)
  75     {
  76       switch (c)
  77         {
  78         case 'z':
  79           reset_watch ();
  80           break;
  81         case 'p':
  82           puts (get_time ());
  83           break;
  84         case 'q':
  85           exit (0);
  86         }
  87       /* Anything remaining on the line is ignored.  */
  88       while (c != '\n' && c != EOF)
  89         c = getchar ();
  90     }
  91   exit (1);
  92 }