lib-src/profile.c

   1 /* profile.c --- generate periodic events for profiling of Emacs Lisp code.
   2  Copyright (C) 1992, 1994, 1999 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, Inc., 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23
  24 /**
  25  **  To be run as an emacs process. Input string that starts with:
  26  **    'z' -- resets the watch (to zero).
  27  **    'p' -- return time (on stdout) as string with format <sec>.<micro-sec>
  28  **    'q' -- exit.
  29  **
  30  **  abstraction : a stopwatch
  31  **  operations: reset_watch, get_time
  32  */
  33 #include <config.h>
  34 #include <stdio.h>
  35 #include <systime.h>
  36
  37 static EMACS_TIME TV1, TV2;
  38 static int watch_not_started = 1; /* flag */
  39 static char time_string[30];
  40
  41 /* Reset the stopwatch to zero.  */
  42
  43 void
  44 reset_watch ()
  45 {
  46   EMACS_GET_TIME (TV1);
  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   EMACS_GET_TIME (TV2);
  60   EMACS_SUB_TIME (TV2, TV2, TV1);
  61   sprintf (time_string, "%lu.%06lu", (unsigned long)EMACS_SECS (TV2), (unsigned long)EMACS_USECS (TV2));
  62   return time_string;
  63 }
  64
  65 #if ! defined (HAVE_GETTIMEOFDAY) && defined (HAVE_TIMEVAL)
  66
  67 /* ARGSUSED */
  68 gettimeofday (tp, tzp)
  69      struct timeval *tp;
  70      struct timezone *tzp;
  71 {
  72   extern long time ();
  73
  74   tp->tv_sec = time ((long *)0);
  75   tp->tv_usec = 0;
  76   if (tzp != 0)
  77     tzp->tz_minuteswest = -1;
  78 }
  79
  80 #endif
  81 \f
  82 int
  83 main ()
  84 {
  85   int c;
  86   while ((c = getchar ()) != EOF)
  87     {
  88       switch (c)
  89         {
  90         case 'z':
  91           reset_watch ();
  92           break;
  93         case 'p':
  94           puts (get_time ());
  95           break;
  96         case 'q':
  97           exit (0);
  98         }
  99       /* Anything remaining on the line is ignored.  */
 100       while (c != '\n' && c != EOF)
 101         c = getchar ();
 102     }
 103   exit (1);
 104 }