glib/tests/timeloop-basic.c
author hgs
Tue, 20 Jul 2010 16:35:53 +0530
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permissions -rw-r--r--
201025
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/* Portions copyright (c) 2009 Nokia Corporation.  All rights reserved.*/
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#undef G_DISABLE_ASSERT
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#undef G_LOG_DOMAIN
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/resource.h>
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#include <sys/time.h>
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#include <sys/poll.h>
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#define TRUE 1
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#define FALSE 0
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static int n_children = 3;
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static int n_active_children;
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static int n_iters = 10000;
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static int write_fds[1024];
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static struct pollfd poll_fds[1024];
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void
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my_pipe (int *fds)
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{
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  if (pipe(fds) < 0)
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    {
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      fprintf (stderr, "Cannot create pipe %s\n", strerror (errno));
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      exit (1);
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    }
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}
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int
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read_all (int fd, char *buf, int len)
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{
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  size_t bytes_read = 0;
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  ssize_t count;
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  while (bytes_read < len)
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    {
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      count = read (fd, buf + bytes_read, len - bytes_read);
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      if (count < 0)
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	{
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	  if (errno != EAGAIN)
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	    return FALSE;
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	}
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      else if (count == 0)
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	return FALSE;
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      bytes_read += count;
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    }
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  return TRUE;
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}
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int
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write_all (int fd, char *buf, int len)
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{
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  size_t bytes_written = 0;
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  ssize_t count;
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  while (bytes_written < len)
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    {
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      count = write (fd, buf + bytes_written, len - bytes_written);
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      if (count < 0)
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	{
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	  if (errno != EAGAIN)
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	    return FALSE;
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	}
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      bytes_written += count;
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    }
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  return TRUE;
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}
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void
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run_child (int in_fd, int out_fd)
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{
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  int i;
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  int val = 1;
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  for (i = 0; i < n_iters; i++)
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    {
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      write_all (out_fd, (char *)&val, sizeof (val));
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      read_all (in_fd, (char *)&val, sizeof (val));
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    }
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  val = 0;
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  write_all (out_fd, (char *)&val, sizeof (val));
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  exit (0);
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}
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int
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input_callback (int source, int dest)
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{
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  int val;
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  if (!read_all (source, (char *)&val, sizeof(val)))
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    {
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      fprintf (stderr,"Unexpected EOF\n");
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      exit (1);
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    }
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  if (val)
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    {
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      write_all (dest, (char *)&val, sizeof(val));
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      return TRUE;
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    }
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  else
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    {
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      close (source);
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      close (dest);
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      n_active_children--;
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diff changeset
   118
      return FALSE;
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parents:
diff changeset
   119
    }
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parents:
diff changeset
   120
}
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parents:
diff changeset
   121
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parents:
diff changeset
   122
void
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parents:
diff changeset
   123
create_child (int pos)
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parents:
diff changeset
   124
{
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diff changeset
   125
  int pid;
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parents:
diff changeset
   126
  int in_fds[2];
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parents:
diff changeset
   127
  int out_fds[2];
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   128
  
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parents:
diff changeset
   129
  my_pipe (in_fds);
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parents:
diff changeset
   130
  my_pipe (out_fds);
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parents:
diff changeset
   131
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   132
  pid = fork ();
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parents:
diff changeset
   133
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parents:
diff changeset
   134
  if (pid > 0)			/* Parent */
47c74d1534e1 Revision: 201011
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parents:
diff changeset
   135
    {
47c74d1534e1 Revision: 201011
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parents:
diff changeset
   136
      close (in_fds[0]);
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parents:
diff changeset
   137
      close (out_fds[1]);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   138
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   139
      write_fds[pos] = in_fds[1];
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   140
      poll_fds[pos].fd = out_fds[0];
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   141
      poll_fds[pos].events = POLLIN;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   142
    }
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   143
  else if (pid == 0)		/* Child */
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   144
    {
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   145
      close (in_fds[1]);
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   146
      close (out_fds[0]);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   147
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   148
      setsid ();
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   149
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   150
      run_child (in_fds[0], out_fds[1]);
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   151
    }
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   152
  else				/* Error */
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   153
    {
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   154
      fprintf (stderr,"Cannot fork: %s\n", strerror (errno));
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   155
      exit (1);
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   156
    }
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   157
}
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   158
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   159
static double 
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   160
difftimeval (struct timeval *old, struct timeval *new)
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   161
{
47c74d1534e1 Revision: 201011
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parents:
diff changeset
   162
  return
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   163
    (new->tv_sec - old->tv_sec) * 1000. + (new->tv_usec - old->tv_usec) / 1000;
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   164
}
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   165
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   166
int 
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   167
main (int argc, char **argv)
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   168
{
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   169
  int i, j;
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   170
  struct rusage old_usage;
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   171
  struct rusage new_usage;
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   172
  
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   173
  if (argc > 1)
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   174
    n_children = atoi(argv[1]);
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   175
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   176
  if (argc > 2)
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   177
    n_iters = atoi(argv[2]);
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   178
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   179
  printf ("Children: %d     Iters: %d\n", n_children, n_iters);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   180
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   181
  n_active_children = n_children;
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   182
  for (i = 0; i < n_children; i++)
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   183
    create_child (i);
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   184
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   185
  getrusage (RUSAGE_SELF, &old_usage);
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   186
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   187
  while (n_active_children > 0)
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   188
    {
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   189
      int old_n_active_children = n_active_children;
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   190
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   191
      poll (poll_fds, n_active_children, -1);
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   192
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   193
      for (i=0; i<n_active_children; i++)
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   194
	{
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   195
	  if (poll_fds[i].events & (POLLIN | POLLHUP))
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   196
	    {
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   197
	      if (!input_callback (poll_fds[i].fd, write_fds[i]))
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   198
		write_fds[i] = -1;
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   199
	    }
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   200
	}
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   201
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   202
      if (old_n_active_children > n_active_children)
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   203
	{
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   204
	  j = 0;
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   205
	  for (i=0; i<old_n_active_children; i++)
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   206
	    {
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   207
	      if (write_fds[i] != -1)
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   208
		{
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   209
		  if (j < i)
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   210
		    {
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   211
		      poll_fds[j] = poll_fds[i];
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   212
		      write_fds[j] = write_fds[i];
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   213
		    }
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   214
		  j++;
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   215
		}
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   216
	    }
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   217
	}
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   218
    }
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   219
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   220
  getrusage (RUSAGE_SELF, &new_usage);
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   221
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   222
  printf ("Elapsed user: %g\n",
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   223
	   difftimeval (&old_usage.ru_utime, &new_usage.ru_utime));
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   224
  printf ("Elapsed system: %g\n",
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   225
	   difftimeval (&old_usage.ru_stime, &new_usage.ru_stime));
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   226
  printf ("Elapsed total: %g\n",
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   227
	  difftimeval (&old_usage.ru_utime, &new_usage.ru_utime) +	   
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   228
	   difftimeval (&old_usage.ru_stime, &new_usage.ru_stime));
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   229
  printf ("total / iteration: %g\n",
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   230
	   (difftimeval (&old_usage.ru_utime, &new_usage.ru_utime) +	   
47c74d1534e1 Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   231
	    difftimeval (&old_usage.ru_stime, &new_usage.ru_stime)) /
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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	   (n_iters * n_children));
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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  return 0;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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