lib-src/profile.c

   1 /* profile.c --- generate periodic events for profiling of Emacs Lisp code.
   2    Copyright (C) 1992, 1994, 1999, 2001, 2002, 2003, 2004,
   3                  2005, 2006, 2007, 2008  Free Software Foundation, Inc.
   4
   5  Author: Boaz Ben-Zvi <boaz@lcs.mit.edu>
   6
   7 This file is part of GNU Emacs.
   8
   9 GNU Emacs is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 3, or (at your option)
  12 any later version.
  13
  14 GNU Emacs is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GNU Emacs; see the file COPYING.  If not, write to
  21 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22 Boston, MA 02110-1301, USA.  */
  23
  24
  25 /**
  26  **  To be run as an emacs process. Input string that starts with:
  27  **    'z' -- resets the watch (to zero).
  28  **    'p' -- return time (on stdout) as string with format <sec>.<micro-sec>
  29  **    'q' -- exit.
  30  **
  31  **  abstraction : a stopwatch
  32  **  operations: reset_watch, get_time
  33  */
  34 #include <config.h>
  35 #include <stdio.h>
  36 #include <systime.h>
  37
  38 static EMACS_TIME TV1, TV2;
  39 static int watch_not_started = 1; /* flag */
  40 static char time_string[30];
  41
  42 /* Reset the stopwatch to zero.  */
  43
  44 void
  45 reset_watch ()
  46 {
  47   EMACS_GET_TIME (TV1);
  48   watch_not_started = 0;
  49 }
  50
  51 /* This call returns the time since the last reset_watch call.  The time
  52    is returned as a string with the format  <seconds>.<micro-seconds>
  53    If reset_watch was not called yet, exit.  */
  54
  55 char *
  56 get_time ()
  57 {
  58   if (watch_not_started)
  59     exit (EXIT_FAILURE);  /* call reset_watch first ! */
  60   EMACS_GET_TIME (TV2);
  61   EMACS_SUB_TIME (TV2, TV2, TV1);
  62   sprintf (time_string, "%lu.%06lu", (unsigned long)EMACS_SECS (TV2), (unsigned long)EMACS_USECS (TV2));
  63   return time_string;
  64 }
  65
  66 #if ! defined (HAVE_GETTIMEOFDAY) && defined (HAVE_TIMEVAL)
  67
  68 /* ARGSUSED */
  69 gettimeofday (tp, tzp)
  70      struct timeval *tp;
  71      struct timezone *tzp;
  72 {
  73   extern long time ();
  74
  75   tp->tv_sec = time ((long *)0);
  76   tp->tv_usec = 0;
  77   if (tzp != 0)
  78     tzp->tz_minuteswest = -1;
  79 }
  80
  81 #endif
  82 \f
  83 int
  84 main ()
  85 {
  86   int c;
  87   while ((c = getchar ()) != EOF)
  88     {
  89       switch (c)
  90         {
  91         case 'z':
  92           reset_watch ();
  93           break;
  94         case 'p':
  95           puts (get_time ());
  96           break;
  97         case 'q':
  98           exit (EXIT_SUCCESS);
  99         }
 100       /* Anything remaining on the line is ignored.  */
 101       while (c != '\n' && c != EOF)
 102         c = getchar ();
 103     }
 104   exit (EXIT_FAILURE);
 105 }
 106
 107 /* arch-tag: 8db68f7e-2322-4944-a315-dba349bdbf39
 108    (do not change this comment) */
 109
 110 /* profile.c ends here */