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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 <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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int errsv = errno;
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fprintf (stderr, "Cannot create pipe %s\n", strerror (errsv));
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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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gssize 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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gssize 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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return FALSE;
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}
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}
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void
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create_child (int pos)
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{
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int pid, errsv;
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int in_fds[2];
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int out_fds[2];
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my_pipe (in_fds);
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my_pipe (out_fds);
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pid = fork ();
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errsv = errno;
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if (pid > 0) /* Parent */
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{
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close (in_fds[0]);
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close (out_fds[1]);
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write_fds[pos] = in_fds[1];
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poll_fds[pos].fd = out_fds[0];
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poll_fds[pos].events = POLLIN;
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}
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else if (pid == 0) /* Child */
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{
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close (in_fds[1]);
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close (out_fds[0]);
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setsid ();
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run_child (in_fds[0], out_fds[1]);
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}
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else /* Error */
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{
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fprintf (stderr,"Cannot fork: %s\n", strerror (errsv));
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exit (1);
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}
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}
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static double
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difftimeval (struct timeval *old, struct timeval *new)
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{
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return
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(new->tv_sec - old->tv_sec) * 1000. + (new->tv_usec - old->tv_usec) / 1000;
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}
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int
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main (int argc, char **argv)
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{
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int i, j;
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struct rusage old_usage;
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struct rusage new_usage;
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if (argc > 1)
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n_children = atoi(argv[1]);
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if (argc > 2)
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n_iters = atoi(argv[2]);
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printf ("Children: %d Iters: %d\n", n_children, n_iters);
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n_active_children = n_children;
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for (i = 0; i < n_children; i++)
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create_child (i);
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getrusage (RUSAGE_SELF, &old_usage);
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while (n_active_children > 0)
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{
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int old_n_active_children = n_active_children;
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poll (poll_fds, n_active_children, -1);
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for (i=0; i
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{
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if (poll_fds[i].events & (POLLIN | POLLHUP))
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{
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if (!input_callback (poll_fds[i].fd, write_fds[i]))
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write_fds[i] = -1;
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}
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}
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if (old_n_active_children > n_active_children)
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{
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j = 0;
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for (i=0; i
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{
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if (write_fds[i] != -1)
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{
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if (j < i)
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{
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poll_fds[j] = poll_fds[i];
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write_fds[j] = write_fds[i];
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}
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j++;
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}
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}
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}
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}
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getrusage (RUSAGE_SELF, &new_usage);
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printf ("Elapsed user: %g\n",
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difftimeval (&old_usage.ru_utime, &new_usage.ru_utime));
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printf ("Elapsed system: %g\n",
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difftimeval (&old_usage.ru_stime, &new_usage.ru_stime));
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printf ("Elapsed total: %g\n",
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difftimeval (&old_usage.ru_utime, &new_usage.ru_utime) +
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difftimeval (&old_usage.ru_stime, &new_usage.ru_stime));
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printf ("total / iteration: %g\n",
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(difftimeval (&old_usage.ru_utime, &new_usage.ru_utime) +
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difftimeval (&old_usage.ru_stime, &new_usage.ru_stime)) /
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(n_iters * n_children));
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return 0;
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}
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