xemacs-21.4 / lib-src / profile.c

/* profile.c --- generate periodic events for profiling of Emacs Lisp code.
 Copyright (C) 1992, 1994 Free Software Foundation, Inc.

 Author: Boaz Ben-Zvi <boaz@lcs.mit.edu>

 This file is part of GNU Emacs.

 GNU Emacs is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2, or (at your option)
 any later version.

 GNU Emacs is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with GNU Emacs; see the file COPYING.  If not, write to
 the Free the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Synched up with: FSF 19.28. */
/* #### Not sure if this is needed for XEmacs. */

 **  To be run as an emacs process. Input string that starts with:
 **    'z' -- resets the watch (to zero).
 **    'p' -- return time (on stdout) as string with format <sec>.<micro-sec>
 **    'q' -- exit.
 **  abstraction : a stopwatch
 **  operations: reset_watch, get_time
#include <../src/config.h>
#include <stdio.h>
#if __STDC__ || defined(STDC_HEADERS)
#include <stdlib.h>
#include "../src/systime.h"

static struct timeval TV1, TV2;
static int watch_not_started = 1; /* flag */
static char time_string[30];

/* Reset the stopwatch to zero.  */

static void
reset_watch (void)
  watch_not_started = 0;

/* This call returns the time since the last reset_watch call.  The time
   is returned as a string with the format  <seconds>.<micro-seconds> 
   If reset_watch was not called yet, exit.  */

static char *
get_time (void)
  if (watch_not_started)
    exit (1);  /* call reset_watch first ! */
  if (TV1.tv_usec > TV2.tv_usec)
      TV2.tv_usec += 1000000;
  sprintf (time_string, "%lu.%06lu",
	  (unsigned long) TV2.tv_sec - TV1.tv_sec,
	  (unsigned long) TV2.tv_usec - TV1.tv_usec);
  return time_string;

main (int argc, char *argv[])
  int c;
  while ((c = getchar ()) != EOF)
      switch (c)
	case 'z':
	  reset_watch ();
	case 'p':
	  puts (get_time ());
	case 'q':
	  exit (0);
      /* Anything remaining on the line is ignored.  */
      while (c != '\n' && c != EOF)
	c = getchar ();
  return 1;
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