lib-src/profile.c

   1 /* profile.c --- generate periodic events for profiling of Emacs Lisp code.
   2    Copyright (C) 1992, 1994, 1999, 2001-2012  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 3 of the License, or
  11 (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21
  22 /**
  23  **  To be run as an emacs process. Input string that starts with:
  24  **    'z' -- resets the watch (to zero).
  25  **    'p' -- return time (on stdout) as string with format <sec>.<micro-sec>
  26  **    'q' -- exit.
  27  **
  28  **  abstraction : a stopwatch
  29  **  operations: reset_watch, get_time
  30  */
  31 #include <config.h>
  32 #include <stdio.h>
  33 #include <systime.h>
  34
  35 static EMACS_TIME TV1, TV2;
  36 static int watch_not_started = 1; /* flag */
  37 static char time_string[30];
  38
  39 /* Reset the stopwatch to zero.  */
  40
  41 static void
  42 reset_watch (void)
  43 {
  44   EMACS_GET_TIME (TV1);
  45   watch_not_started = 0;
  46 }
  47
  48 /* This call returns the time since the last reset_watch call.  The time
  49    is returned as a string with the format  <seconds>.<micro-seconds>
  50    If reset_watch was not called yet, exit.  */
  51
  52 static char *
  53 get_time (void)
  54 {
  55   if (watch_not_started)
  56     exit (EXIT_FAILURE);  /* call reset_watch first ! */
  57   EMACS_GET_TIME (TV2);
  58   EMACS_SUB_TIME (TV2, TV2, TV1);
  59   sprintf (time_string, "%lu.%06lu", (unsigned long)EMACS_SECS (TV2), (unsigned long)EMACS_USECS (TV2));
  60   return time_string;
  61 }
  62
  63 #if ! defined (HAVE_GETTIMEOFDAY) && defined (HAVE_TIMEVAL)
  64
  65 /* ARGSUSED */
  66 gettimeofday (tp, tzp)
  67      struct timeval *tp;
  68      struct timezone *tzp;
  69 {
  70   extern long time ();
  71
  72   tp->tv_sec = time ((long *)0);
  73   tp->tv_usec = 0;
  74   if (tzp != 0)
  75     tzp->tz_minuteswest = -1;
  76 }
  77
  78 #endif
  79 \f
  80 int
  81 main (void)
  82 {
  83   int c;
  84   while ((c = getchar ()) != EOF)
  85     {
  86       switch (c)
  87         {
  88         case 'z':
  89           reset_watch ();
  90           break;
  91         case 'p':
  92           puts (get_time ());
  93           break;
  94         case 'q':
  95           exit (EXIT_SUCCESS);
  96         }
  97       /* Anything remaining on the line is ignored.  */
  98       while (c != '\n' && c != EOF)
  99         c = getchar ();
 100     }
 101   exit (EXIT_FAILURE);
 102 }
 103
 104
 105 /* profile.c ends here */