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/* profile.c --- generate periodic events for profiling of Emacs Lisp code.
Copyright (C) 1992, 1994, 1999, 2001-2017 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 3 of the License, 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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
/**
** To be run as an emacs subprocess. 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
*/
#define INLINE EXTERN_INLINE
#include <config.h>
#include <inttypes.h>
#include <stdlib.h>
#include <intprops.h>
#include <systime.h>
#include <unlocked-io.h>
static struct timespec TV1;
static int watch_not_started = 1; /* flag */
static char time_string[INT_STRLEN_BOUND (uintmax_t) + sizeof "."
+ LOG10_TIMESPEC_RESOLUTION];
/* Reset the stopwatch to zero. */
static void
reset_watch (void)
{
TV1 = current_timespec ();
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>.<nanoseconds>
If reset_watch was not called yet, exit. */
static char *
get_time (void)
{
struct timespec TV2 = timespec_sub (current_timespec (), TV1);
uintmax_t s = TV2.tv_sec;
int ns = TV2.tv_nsec;
if (watch_not_started)
exit (EXIT_FAILURE); /* call reset_watch first ! */
sprintf (time_string, "%"PRIuMAX".%0*d", s, LOG10_TIMESPEC_RESOLUTION, ns);
return time_string;
}
int
main (void)
{
int c;
while ((c = getchar ()) != EOF)
{
switch (c)
{
case 'z':
reset_watch ();
break;
case 'p':
puts (get_time ());
break;
case 'q':
return EXIT_SUCCESS;
}
/* Anything remaining on the line is ignored. */
while (c != '\n' && c != EOF)
c = getchar ();
}
return EXIT_FAILURE;
}
/* profile.c ends here */
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