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, 2005, 2006,
   3                  2007, 2008, 2009, 2010  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 of the License, or
  12 (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.  */
  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 <config.h>
  33 #include <stdio.h>
  34 #include <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 (void)
  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 (void)
  55 {
  56   if (watch_not_started)
  57     exit (EXIT_FAILURE);  /* call reset_watch first ! */
  58   EMACS_GET_TIME (TV2);
  59   EMACS_SUB_TIME (TV2, TV2, TV1);
  60   sprintf (time_string, "%lu.%06lu", (unsigned long)EMACS_SECS (TV2), (unsigned long)EMACS_USECS (TV2));
  61   return time_string;
  62 }
  63
  64 #if ! defined (HAVE_GETTIMEOFDAY) && defined (HAVE_TIMEVAL)
  65
  66 /* ARGSUSED */
  67 gettimeofday (tp, tzp)
  68      struct timeval *tp;
  69      struct timezone *tzp;
  70 {
  71   extern long time ();
  72
  73   tp->tv_sec = time ((long *)0);
  74   tp->tv_usec = 0;
  75   if (tzp != 0)
  76     tzp->tz_minuteswest = -1;
  77 }
  78
  79 #endif
  80 \f
  81 int
  82 main (void)
  83 {
  84   int c;
  85   while ((c = getchar ()) != EOF)
  86     {
  87       switch (c)
  88         {
  89         case 'z':
  90           reset_watch ();
  91           break;
  92         case 'p':
  93           puts (get_time ());
  94           break;
  95         case 'q':
  96           exit (EXIT_SUCCESS);
  97         }
  98       /* Anything remaining on the line is ignored.  */
  99       while (c != '\n' && c != EOF)
 100         c = getchar ();
 101     }
 102   exit (EXIT_FAILURE);
 103 }
 104
 105 /* arch-tag: 8db68f7e-2322-4944-a315-dba349bdbf39
 106    (do not change this comment) */
 107
 108 /* profile.c ends here */