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 EMACS_TIME TV1, TV2;
  37 static int watch_not_started = 1; /* flag */
  38 static char time_string[30];
  39
  40 /* Reset the stopwatch to zero.  */
  41
  42 void
  43 reset_watch ()
  44 {
  45   EMACS_GET_TIME (TV1);
  46   watch_not_started = 0;
  47 }
  48
  49 /* This call returns the time since the last reset_watch call.  The time
  50    is returned as a string with the format  <seconds>.<micro-seconds>
  51    If reset_watch was not called yet, exit.  */
  52
  53 char *
  54 get_time ()
  55 {
  56   if (watch_not_started)
  57     exit (1);  /* call reset_watch first ! */
  58   EMACS_GET_TIME (TV2);
  59   EMACS_SUB_TIME (TV2, TV2, TV1);
  60   sprintf (time_string, "%lu.%06lu", EMACS_SECS (TV2), EMACS_USECS (TV2));
  61   return time_string;
  62 }
  63
  64 void
  65 main ()
  66 {
  67   int c;
  68   while ((c = getchar ()) != EOF)
  69     {
  70       switch (c)
  71         {
  72         case 'z':
  73           reset_watch ();
  74           break;
  75         case 'p':
  76           puts (get_time ());
  77           break;
  78         case 'q':
  79           exit (0);
  80         }
  81       /* Anything remaining on the line is ignored.  */
  82       while (c != '\n' && c != EOF)
  83         c = getchar ();
  84     }
  85   exit (1);
  86 }