FreeBSD port (30): profiling frequency

[Bruno Haible <bruno at clisp dot org>]

Hi,

Since the generic code for determining the profiler frequency in
sysdeps/generic/prof-freq.c doesn't work on FreeBSD (it gives a SIGFPE
due to division by zero), I'd like to contribute a program that measures
and displays the profiling timer's frequency. This program allowed me
to determine the value to put into
sysdeps/unix/bsd/bsd4.4/freebsd/i386/prof-freq.c.


2002-07-06  Bruno Haible  <bruno@clisp.org>

	* sysdeps/posix/show-prof-freq.c: New file.
	* sysdeps/posix/Dist: New file.

--- /dev/null	Sat Jul  6 20:56:49 2002
+++ glibc-20020627/sysdeps/posix/show-prof-freq.c	Sun Jun 30 21:59:31 2002
@@ -0,0 +1,81 @@
+/* Show the profiler frequency.  Use for porting __profile_frequency().
+   Copyright (C) 2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/time.h>
+
+struct timeval start_time;
+struct timeval end_time;
+
+int counter;
+
+static void prof_handler ()
+{
+  counter++;
+}
+
+static void int_handler ()
+{
+  /* Take end time.  */
+  gettimeofday (&end_time, NULL);
+
+  printf ("\n");
+  printf ("Number of ITIMER_PROF ticks: %d\n", counter);
+  printf ("Frequency of ITIMER_PROF ticks: %g / sec\n",
+	  (double) counter
+	  / ((end_time.tv_sec + 1e-6 * end_time.tv_usec)
+	     - (start_time. tv_sec + 1e-6 * start_time.tv_usec)));
+  printf ("For comparison: CLK_TCK = %d\n", CLK_TCK);
+  exit (0);
+}
+
+int main ()
+{
+  struct sigaction act;
+  struct itimerval timer;
+
+  printf ("Calibrating...\n");
+
+  signal (SIGINT, int_handler);
+  signal (SIGALRM, int_handler);
+
+  /* Set up the profiling action.  */
+  act.sa_handler = prof_handler;
+  act.sa_flags = SA_RESTART;
+  sigfillset (&act.sa_mask);
+  sigaction (SIGPROF, &act, NULL);
+
+  /* Take start time.  */
+  gettimeofday (&start_time, NULL);
+
+  /* Start profiling timer.  */
+  timer.it_value.tv_sec  = 0;
+  timer.it_value.tv_usec = 1;
+  timer.it_interval.tv_sec  = 0;
+  timer.it_interval.tv_usec = 1;
+  setitimer (ITIMER_PROF, &timer, NULL);
+
+  alarm (10);
+
+  for (;;);
+}
--- /dev/null	Sat Jul  6 20:56:49 2002
+++ glibc-20020627/sysdeps/posix/Dist	Sun Jul  7 01:24:58 2002
@@ -0,0 +1,1 @@
+show-prof-freq.c