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  Free Software Foundation, Inc.
4
5 Author: Boaz Ben-Zvi <boaz@lcs.mit.edu>
6
7This file is part of GNU Emacs.
8
9GNU Emacs is free software; you can redistribute it and/or modify
10it under the terms of the GNU General Public License as published by
11the Free Software Foundation; either version 2, or (at your option)
12any later version.
13
14GNU Emacs is distributed in the hope that it will be useful,
15but WITHOUT ANY WARRANTY; without even the implied warranty of
16MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17GNU General Public License for more details.
18
19You should have received a copy of the GNU General Public License
20along with GNU Emacs; see the file COPYING.  If not, write to
21the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
22Boston, 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
38static EMACS_TIME TV1, TV2;
39static int watch_not_started = 1; /* flag */
40static char time_string[30];
41
42/* Reset the stopwatch to zero.  */
43
44void
45reset_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
55char *
56get_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 */
69gettimeofday (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
83int
84main ()
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 */
111