glib/tests/timeloop.c

222 lines
4.5 KiB
C
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#undef G_DISABLE_ASSERT
#undef G_LOG_DOMAIN
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <glib.h>
static int n_children = 3;
static int n_active_children;
static int n_iters = 10000;
static GMainLoop *loop;
Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. Wed Jun 20 12:00:54 2001 Owen Taylor <otaylor@redhat.com> Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. * gconvert.c (g_convert/g_convert_with_fallback): Remove workarounds for since-fixed GNU libc bugs. Minor doc fix. * gconvert.[ch]: Change gint to gsize/gssize as appropriate. * gconvert.c (g_locale/filename_to/from_utf8): Fix incorrect computation of bytes_read / bytes_written. * gfileutils.[ch] (g_file_get_contents): Make length out parameter 'gsize *len'. * ghook.c (g_hook_compare_ids): Don't compare a and b as 'a - b'. * gmacros.h (GSIZE_TO_POINTER): Add GPOINTER_TO_SIZE, GSIZE_TO_POINTER. * gmain.c (g_timeout_prepare): Rewrite to avoid overflows. (Fixes bug when system clock skews backwards more than 24 days.) * gmarkup.[ch]: Make lengths passed to callbacks gsize, length for g_markup_parse-context_parse(), g_markup_escape_text() gssize. * gmessages.[ch] (g_printf_string_upper_bound): Change return value to gsize. * gmessages.c (printf_string_upper_bound): Remove a ridiculous use of 'inline' on a 300 line function. * gstring.[ch]: Represent size of string as a gsize, not gint. Make parameters to functions take gsize, or gssize where -1 is allowed. * gstring.c (g_string_erase): Make g_string_erase (string, pos, -1) a synonym for g_string_truncate for consistency with other G* APIs. * gstrfuncs.[ch]: Make all functions taking a string length, take a gsize, or gssize if -1 is allowed. (g_strstr_len, g_strrstr_len). Also fix some boundary conditions in g_str[r]str[_len]. * gutf8.c tests/unicode-encoding.c: Make parameters that are byte lengths gsize, gssize as appropriate. Make character offsets, other counts, glong. * gasyncqueue.c gcompletion.c timeloop.c timeloop-basic.c gutils.c gspawn.c. Small 64 bit cleanliness fixups. * glist.c (g_list_sort2, g_list_sort_real): Fix functions that should have been static. * gdate.c (g_date_fill_parse_tokens): Fix extra declaration that was shadowing another. * tests/module-test.c: Include string.h Mon Jun 18 15:43:29 2001 Owen Taylor <otaylor@redhat.com> * gutf8.c (g_get_charset): Make argument G_CONST_RETURN char **.
2001-06-23 15:55:09 +02:00
static void
io_pipe (GIOChannel **channels)
{
int fds[2];
if (pipe(fds) < 0)
{
int errsv = errno;
fprintf (stderr, "Cannot create pipe %s\n", g_strerror (errsv));
exit (1);
}
channels[0] = g_io_channel_unix_new (fds[0]);
channels[1] = g_io_channel_unix_new (fds[1]);
}
Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. Wed Jun 20 12:00:54 2001 Owen Taylor <otaylor@redhat.com> Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. * gconvert.c (g_convert/g_convert_with_fallback): Remove workarounds for since-fixed GNU libc bugs. Minor doc fix. * gconvert.[ch]: Change gint to gsize/gssize as appropriate. * gconvert.c (g_locale/filename_to/from_utf8): Fix incorrect computation of bytes_read / bytes_written. * gfileutils.[ch] (g_file_get_contents): Make length out parameter 'gsize *len'. * ghook.c (g_hook_compare_ids): Don't compare a and b as 'a - b'. * gmacros.h (GSIZE_TO_POINTER): Add GPOINTER_TO_SIZE, GSIZE_TO_POINTER. * gmain.c (g_timeout_prepare): Rewrite to avoid overflows. (Fixes bug when system clock skews backwards more than 24 days.) * gmarkup.[ch]: Make lengths passed to callbacks gsize, length for g_markup_parse-context_parse(), g_markup_escape_text() gssize. * gmessages.[ch] (g_printf_string_upper_bound): Change return value to gsize. * gmessages.c (printf_string_upper_bound): Remove a ridiculous use of 'inline' on a 300 line function. * gstring.[ch]: Represent size of string as a gsize, not gint. Make parameters to functions take gsize, or gssize where -1 is allowed. * gstring.c (g_string_erase): Make g_string_erase (string, pos, -1) a synonym for g_string_truncate for consistency with other G* APIs. * gstrfuncs.[ch]: Make all functions taking a string length, take a gsize, or gssize if -1 is allowed. (g_strstr_len, g_strrstr_len). Also fix some boundary conditions in g_str[r]str[_len]. * gutf8.c tests/unicode-encoding.c: Make parameters that are byte lengths gsize, gssize as appropriate. Make character offsets, other counts, glong. * gasyncqueue.c gcompletion.c timeloop.c timeloop-basic.c gutils.c gspawn.c. Small 64 bit cleanliness fixups. * glist.c (g_list_sort2, g_list_sort_real): Fix functions that should have been static. * gdate.c (g_date_fill_parse_tokens): Fix extra declaration that was shadowing another. * tests/module-test.c: Include string.h Mon Jun 18 15:43:29 2001 Owen Taylor <otaylor@redhat.com> * gutf8.c (g_get_charset): Make argument G_CONST_RETURN char **.
2001-06-23 15:55:09 +02:00
static gboolean
read_all (GIOChannel *channel, char *buf, gsize len)
{
Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. Wed Jun 20 12:00:54 2001 Owen Taylor <otaylor@redhat.com> Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. * gconvert.c (g_convert/g_convert_with_fallback): Remove workarounds for since-fixed GNU libc bugs. Minor doc fix. * gconvert.[ch]: Change gint to gsize/gssize as appropriate. * gconvert.c (g_locale/filename_to/from_utf8): Fix incorrect computation of bytes_read / bytes_written. * gfileutils.[ch] (g_file_get_contents): Make length out parameter 'gsize *len'. * ghook.c (g_hook_compare_ids): Don't compare a and b as 'a - b'. * gmacros.h (GSIZE_TO_POINTER): Add GPOINTER_TO_SIZE, GSIZE_TO_POINTER. * gmain.c (g_timeout_prepare): Rewrite to avoid overflows. (Fixes bug when system clock skews backwards more than 24 days.) * gmarkup.[ch]: Make lengths passed to callbacks gsize, length for g_markup_parse-context_parse(), g_markup_escape_text() gssize. * gmessages.[ch] (g_printf_string_upper_bound): Change return value to gsize. * gmessages.c (printf_string_upper_bound): Remove a ridiculous use of 'inline' on a 300 line function. * gstring.[ch]: Represent size of string as a gsize, not gint. Make parameters to functions take gsize, or gssize where -1 is allowed. * gstring.c (g_string_erase): Make g_string_erase (string, pos, -1) a synonym for g_string_truncate for consistency with other G* APIs. * gstrfuncs.[ch]: Make all functions taking a string length, take a gsize, or gssize if -1 is allowed. (g_strstr_len, g_strrstr_len). Also fix some boundary conditions in g_str[r]str[_len]. * gutf8.c tests/unicode-encoding.c: Make parameters that are byte lengths gsize, gssize as appropriate. Make character offsets, other counts, glong. * gasyncqueue.c gcompletion.c timeloop.c timeloop-basic.c gutils.c gspawn.c. Small 64 bit cleanliness fixups. * glist.c (g_list_sort2, g_list_sort_real): Fix functions that should have been static. * gdate.c (g_date_fill_parse_tokens): Fix extra declaration that was shadowing another. * tests/module-test.c: Include string.h Mon Jun 18 15:43:29 2001 Owen Taylor <otaylor@redhat.com> * gutf8.c (g_get_charset): Make argument G_CONST_RETURN char **.
2001-06-23 15:55:09 +02:00
gsize bytes_read = 0;
gsize count;
GIOError err;
while (bytes_read < len)
{
err = g_io_channel_read (channel, buf + bytes_read, len - bytes_read, &count);
if (err)
{
if (err != G_IO_ERROR_AGAIN)
return FALSE;
}
else if (count == 0)
return FALSE;
bytes_read += count;
}
return TRUE;
}
Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. Wed Jun 20 12:00:54 2001 Owen Taylor <otaylor@redhat.com> Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. * gconvert.c (g_convert/g_convert_with_fallback): Remove workarounds for since-fixed GNU libc bugs. Minor doc fix. * gconvert.[ch]: Change gint to gsize/gssize as appropriate. * gconvert.c (g_locale/filename_to/from_utf8): Fix incorrect computation of bytes_read / bytes_written. * gfileutils.[ch] (g_file_get_contents): Make length out parameter 'gsize *len'. * ghook.c (g_hook_compare_ids): Don't compare a and b as 'a - b'. * gmacros.h (GSIZE_TO_POINTER): Add GPOINTER_TO_SIZE, GSIZE_TO_POINTER. * gmain.c (g_timeout_prepare): Rewrite to avoid overflows. (Fixes bug when system clock skews backwards more than 24 days.) * gmarkup.[ch]: Make lengths passed to callbacks gsize, length for g_markup_parse-context_parse(), g_markup_escape_text() gssize. * gmessages.[ch] (g_printf_string_upper_bound): Change return value to gsize. * gmessages.c (printf_string_upper_bound): Remove a ridiculous use of 'inline' on a 300 line function. * gstring.[ch]: Represent size of string as a gsize, not gint. Make parameters to functions take gsize, or gssize where -1 is allowed. * gstring.c (g_string_erase): Make g_string_erase (string, pos, -1) a synonym for g_string_truncate for consistency with other G* APIs. * gstrfuncs.[ch]: Make all functions taking a string length, take a gsize, or gssize if -1 is allowed. (g_strstr_len, g_strrstr_len). Also fix some boundary conditions in g_str[r]str[_len]. * gutf8.c tests/unicode-encoding.c: Make parameters that are byte lengths gsize, gssize as appropriate. Make character offsets, other counts, glong. * gasyncqueue.c gcompletion.c timeloop.c timeloop-basic.c gutils.c gspawn.c. Small 64 bit cleanliness fixups. * glist.c (g_list_sort2, g_list_sort_real): Fix functions that should have been static. * gdate.c (g_date_fill_parse_tokens): Fix extra declaration that was shadowing another. * tests/module-test.c: Include string.h Mon Jun 18 15:43:29 2001 Owen Taylor <otaylor@redhat.com> * gutf8.c (g_get_charset): Make argument G_CONST_RETURN char **.
2001-06-23 15:55:09 +02:00
static gboolean
write_all (GIOChannel *channel, char *buf, gsize len)
{
Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. Wed Jun 20 12:00:54 2001 Owen Taylor <otaylor@redhat.com> Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. * gconvert.c (g_convert/g_convert_with_fallback): Remove workarounds for since-fixed GNU libc bugs. Minor doc fix. * gconvert.[ch]: Change gint to gsize/gssize as appropriate. * gconvert.c (g_locale/filename_to/from_utf8): Fix incorrect computation of bytes_read / bytes_written. * gfileutils.[ch] (g_file_get_contents): Make length out parameter 'gsize *len'. * ghook.c (g_hook_compare_ids): Don't compare a and b as 'a - b'. * gmacros.h (GSIZE_TO_POINTER): Add GPOINTER_TO_SIZE, GSIZE_TO_POINTER. * gmain.c (g_timeout_prepare): Rewrite to avoid overflows. (Fixes bug when system clock skews backwards more than 24 days.) * gmarkup.[ch]: Make lengths passed to callbacks gsize, length for g_markup_parse-context_parse(), g_markup_escape_text() gssize. * gmessages.[ch] (g_printf_string_upper_bound): Change return value to gsize. * gmessages.c (printf_string_upper_bound): Remove a ridiculous use of 'inline' on a 300 line function. * gstring.[ch]: Represent size of string as a gsize, not gint. Make parameters to functions take gsize, or gssize where -1 is allowed. * gstring.c (g_string_erase): Make g_string_erase (string, pos, -1) a synonym for g_string_truncate for consistency with other G* APIs. * gstrfuncs.[ch]: Make all functions taking a string length, take a gsize, or gssize if -1 is allowed. (g_strstr_len, g_strrstr_len). Also fix some boundary conditions in g_str[r]str[_len]. * gutf8.c tests/unicode-encoding.c: Make parameters that are byte lengths gsize, gssize as appropriate. Make character offsets, other counts, glong. * gasyncqueue.c gcompletion.c timeloop.c timeloop-basic.c gutils.c gspawn.c. Small 64 bit cleanliness fixups. * glist.c (g_list_sort2, g_list_sort_real): Fix functions that should have been static. * gdate.c (g_date_fill_parse_tokens): Fix extra declaration that was shadowing another. * tests/module-test.c: Include string.h Mon Jun 18 15:43:29 2001 Owen Taylor <otaylor@redhat.com> * gutf8.c (g_get_charset): Make argument G_CONST_RETURN char **.
2001-06-23 15:55:09 +02:00
gsize bytes_written = 0;
gsize count;
GIOError err;
while (bytes_written < len)
{
err = g_io_channel_write (channel, buf + bytes_written, len - bytes_written, &count);
if (err && err != G_IO_ERROR_AGAIN)
return FALSE;
bytes_written += count;
}
return TRUE;
}
Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. Wed Jun 20 12:00:54 2001 Owen Taylor <otaylor@redhat.com> Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. * gconvert.c (g_convert/g_convert_with_fallback): Remove workarounds for since-fixed GNU libc bugs. Minor doc fix. * gconvert.[ch]: Change gint to gsize/gssize as appropriate. * gconvert.c (g_locale/filename_to/from_utf8): Fix incorrect computation of bytes_read / bytes_written. * gfileutils.[ch] (g_file_get_contents): Make length out parameter 'gsize *len'. * ghook.c (g_hook_compare_ids): Don't compare a and b as 'a - b'. * gmacros.h (GSIZE_TO_POINTER): Add GPOINTER_TO_SIZE, GSIZE_TO_POINTER. * gmain.c (g_timeout_prepare): Rewrite to avoid overflows. (Fixes bug when system clock skews backwards more than 24 days.) * gmarkup.[ch]: Make lengths passed to callbacks gsize, length for g_markup_parse-context_parse(), g_markup_escape_text() gssize. * gmessages.[ch] (g_printf_string_upper_bound): Change return value to gsize. * gmessages.c (printf_string_upper_bound): Remove a ridiculous use of 'inline' on a 300 line function. * gstring.[ch]: Represent size of string as a gsize, not gint. Make parameters to functions take gsize, or gssize where -1 is allowed. * gstring.c (g_string_erase): Make g_string_erase (string, pos, -1) a synonym for g_string_truncate for consistency with other G* APIs. * gstrfuncs.[ch]: Make all functions taking a string length, take a gsize, or gssize if -1 is allowed. (g_strstr_len, g_strrstr_len). Also fix some boundary conditions in g_str[r]str[_len]. * gutf8.c tests/unicode-encoding.c: Make parameters that are byte lengths gsize, gssize as appropriate. Make character offsets, other counts, glong. * gasyncqueue.c gcompletion.c timeloop.c timeloop-basic.c gutils.c gspawn.c. Small 64 bit cleanliness fixups. * glist.c (g_list_sort2, g_list_sort_real): Fix functions that should have been static. * gdate.c (g_date_fill_parse_tokens): Fix extra declaration that was shadowing another. * tests/module-test.c: Include string.h Mon Jun 18 15:43:29 2001 Owen Taylor <otaylor@redhat.com> * gutf8.c (g_get_charset): Make argument G_CONST_RETURN char **.
2001-06-23 15:55:09 +02:00
static void
run_child (GIOChannel *in_channel, GIOChannel *out_channel)
{
int i;
int val = 1;
GTimer *timer = g_timer_new();
for (i = 0; i < n_iters; i++)
{
write_all (out_channel, (char *)&val, sizeof (val));
read_all (in_channel, (char *)&val, sizeof (val));
}
val = 0;
write_all (out_channel, (char *)&val, sizeof (val));
val = g_timer_elapsed (timer, NULL) * 1000;
write_all (out_channel, (char *)&val, sizeof (val));
g_timer_destroy (timer);
exit (0);
}
Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. Wed Jun 20 12:00:54 2001 Owen Taylor <otaylor@redhat.com> Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. * gconvert.c (g_convert/g_convert_with_fallback): Remove workarounds for since-fixed GNU libc bugs. Minor doc fix. * gconvert.[ch]: Change gint to gsize/gssize as appropriate. * gconvert.c (g_locale/filename_to/from_utf8): Fix incorrect computation of bytes_read / bytes_written. * gfileutils.[ch] (g_file_get_contents): Make length out parameter 'gsize *len'. * ghook.c (g_hook_compare_ids): Don't compare a and b as 'a - b'. * gmacros.h (GSIZE_TO_POINTER): Add GPOINTER_TO_SIZE, GSIZE_TO_POINTER. * gmain.c (g_timeout_prepare): Rewrite to avoid overflows. (Fixes bug when system clock skews backwards more than 24 days.) * gmarkup.[ch]: Make lengths passed to callbacks gsize, length for g_markup_parse-context_parse(), g_markup_escape_text() gssize. * gmessages.[ch] (g_printf_string_upper_bound): Change return value to gsize. * gmessages.c (printf_string_upper_bound): Remove a ridiculous use of 'inline' on a 300 line function. * gstring.[ch]: Represent size of string as a gsize, not gint. Make parameters to functions take gsize, or gssize where -1 is allowed. * gstring.c (g_string_erase): Make g_string_erase (string, pos, -1) a synonym for g_string_truncate for consistency with other G* APIs. * gstrfuncs.[ch]: Make all functions taking a string length, take a gsize, or gssize if -1 is allowed. (g_strstr_len, g_strrstr_len). Also fix some boundary conditions in g_str[r]str[_len]. * gutf8.c tests/unicode-encoding.c: Make parameters that are byte lengths gsize, gssize as appropriate. Make character offsets, other counts, glong. * gasyncqueue.c gcompletion.c timeloop.c timeloop-basic.c gutils.c gspawn.c. Small 64 bit cleanliness fixups. * glist.c (g_list_sort2, g_list_sort_real): Fix functions that should have been static. * gdate.c (g_date_fill_parse_tokens): Fix extra declaration that was shadowing another. * tests/module-test.c: Include string.h Mon Jun 18 15:43:29 2001 Owen Taylor <otaylor@redhat.com> * gutf8.c (g_get_charset): Make argument G_CONST_RETURN char **.
2001-06-23 15:55:09 +02:00
static gboolean
input_callback (GIOChannel *source,
GIOCondition condition,
gpointer data)
{
int val;
GIOChannel *dest = (GIOChannel *)data;
if (!read_all (source, (char *)&val, sizeof(val)))
{
fprintf (stderr, "Unexpected EOF\n");
exit (1);
}
if (val)
{
write_all (dest, (char *)&val, sizeof(val));
return TRUE;
}
else
{
g_io_channel_close (source);
g_io_channel_close (dest);
g_io_channel_unref (source);
g_io_channel_unref (dest);
n_active_children--;
if (n_active_children == 0)
g_main_loop_quit (loop);
return FALSE;
}
}
Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. Wed Jun 20 12:00:54 2001 Owen Taylor <otaylor@redhat.com> Changes for 64-bit cleanliness, loosely based on patch from Mark Murnane. * gconvert.c (g_convert/g_convert_with_fallback): Remove workarounds for since-fixed GNU libc bugs. Minor doc fix. * gconvert.[ch]: Change gint to gsize/gssize as appropriate. * gconvert.c (g_locale/filename_to/from_utf8): Fix incorrect computation of bytes_read / bytes_written. * gfileutils.[ch] (g_file_get_contents): Make length out parameter 'gsize *len'. * ghook.c (g_hook_compare_ids): Don't compare a and b as 'a - b'. * gmacros.h (GSIZE_TO_POINTER): Add GPOINTER_TO_SIZE, GSIZE_TO_POINTER. * gmain.c (g_timeout_prepare): Rewrite to avoid overflows. (Fixes bug when system clock skews backwards more than 24 days.) * gmarkup.[ch]: Make lengths passed to callbacks gsize, length for g_markup_parse-context_parse(), g_markup_escape_text() gssize. * gmessages.[ch] (g_printf_string_upper_bound): Change return value to gsize. * gmessages.c (printf_string_upper_bound): Remove a ridiculous use of 'inline' on a 300 line function. * gstring.[ch]: Represent size of string as a gsize, not gint. Make parameters to functions take gsize, or gssize where -1 is allowed. * gstring.c (g_string_erase): Make g_string_erase (string, pos, -1) a synonym for g_string_truncate for consistency with other G* APIs. * gstrfuncs.[ch]: Make all functions taking a string length, take a gsize, or gssize if -1 is allowed. (g_strstr_len, g_strrstr_len). Also fix some boundary conditions in g_str[r]str[_len]. * gutf8.c tests/unicode-encoding.c: Make parameters that are byte lengths gsize, gssize as appropriate. Make character offsets, other counts, glong. * gasyncqueue.c gcompletion.c timeloop.c timeloop-basic.c gutils.c gspawn.c. Small 64 bit cleanliness fixups. * glist.c (g_list_sort2, g_list_sort_real): Fix functions that should have been static. * gdate.c (g_date_fill_parse_tokens): Fix extra declaration that was shadowing another. * tests/module-test.c: Include string.h Mon Jun 18 15:43:29 2001 Owen Taylor <otaylor@redhat.com> * gutf8.c (g_get_charset): Make argument G_CONST_RETURN char **.
2001-06-23 15:55:09 +02:00
static void
create_child (void)
{
int pid, errsv;
GIOChannel *in_channels[2];
GIOChannel *out_channels[2];
io_pipe (in_channels);
io_pipe (out_channels);
pid = fork ();
errsv = errno;
if (pid > 0) /* Parent */
{
g_io_channel_close (in_channels[0]);
g_io_channel_unref (in_channels[0]);
g_io_channel_close (out_channels[1]);
g_io_channel_unref (out_channels[1]);
g_io_add_watch (out_channels[0], G_IO_IN | G_IO_HUP,
input_callback, in_channels[1]);
}
else if (pid == 0) /* Child */
{
g_io_channel_close (in_channels[1]);
g_io_channel_close (out_channels[0]);
setsid ();
run_child (in_channels[0], out_channels[1]);
}
else /* Error */
{
fprintf (stderr, "Cannot fork: %s\n", g_strerror (errsv));
exit (1);
}
}
static double
difftimeval (struct timeval *old, struct timeval *new)
{
return
(new->tv_sec - old->tv_sec) * 1000. + (new->tv_usec - old->tv_usec) / 1000;
}
int
main (int argc, char **argv)
{
int i;
struct rusage old_usage;
struct rusage new_usage;
if (argc > 1)
n_children = atoi(argv[1]);
if (argc > 2)
n_iters = atoi(argv[2]);
printf ("Children: %d Iters: %d\n", n_children, n_iters);
n_active_children = n_children;
for (i = 0; i < n_children; i++)
create_child ();
getrusage (RUSAGE_SELF, &old_usage);
loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (loop);
getrusage (RUSAGE_SELF, &new_usage);
printf ("Elapsed user: %g\n",
difftimeval (&old_usage.ru_utime, &new_usage.ru_utime));
printf ("Elapsed system: %g\n",
difftimeval (&old_usage.ru_stime, &new_usage.ru_stime));
printf ("Elapsed total: %g\n",
difftimeval (&old_usage.ru_utime, &new_usage.ru_utime) +
difftimeval (&old_usage.ru_stime, &new_usage.ru_stime));
printf ("total / iteration: %g\n",
(difftimeval (&old_usage.ru_utime, &new_usage.ru_utime) +
difftimeval (&old_usage.ru_stime, &new_usage.ru_stime)) /
(n_iters * n_children));
g_main_loop_unref (loop);
return 0;
}