/* Tests process-shared barriers.

   Copyright (C) 2002-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.

   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, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <pthread.h>

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <sys/mman.h>

#include <sys/wait.h>

static int

do_test (void)

{

  size_t ps = sysconf (_SC_PAGESIZE);

  char tmpfname[] = "/tmp/tst-barrier2.XXXXXX";

  char data[ps];

  void *mem;

  int fd;

  pthread_barrier_t *b;

  pthread_barrierattr_t a;

  pid_t pid;

  int serials = 0;

  int cnt;

  int status;

  int p;

  fd = mkstemp (tmpfname);

  if (fd == -1)

    {

      printf ("cannot open temporary file: %m\n");

      return 1;

    }

  /* Make sure it is always removed.  */

  unlink (tmpfname);

  /* Create one page of data.  */

  memset (data, '\0', ps);

  /* Write the data to the file.  */

  if (write (fd, data, ps) != (ssize_t) ps)

    {

      puts ("short write");

      return 1;

    }

  mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);

  if (mem == MAP_FAILED)

    {

      printf ("mmap failed: %m\n");

      return 1;

    }

  b = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t))

			     & ~(__alignof (pthread_barrier_t) - 1));

  if (pthread_barrierattr_init (&a) != 0)

    {

      puts ("barrierattr_init failed");

      return 1;

    }

  if (pthread_barrierattr_getpshared (&a, &p) != 0)

    {

      puts ("1st barrierattr_getpshared failed");

      return 1;

    }

  if (p != PTHREAD_PROCESS_PRIVATE)

    {

      puts ("default pshared value wrong");

      return 1;

    }

  if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)

    {

      puts ("barrierattr_setpshared failed");

      return 1;

    }

  if (pthread_barrierattr_getpshared (&a, &p) != 0)

    {

      puts ("2nd barrierattr_getpshared failed");

      return 1;

    }

  if (p != PTHREAD_PROCESS_SHARED)

    {

      puts ("pshared value after setpshared call wrong");

      return 1;

    }

  if (pthread_barrier_init (b, &a, 2) != 0)

    {

      puts ("barrier_init failed");

      return 1;

    }

  if (pthread_barrierattr_destroy (&a) != 0)

    {

      puts ("barrierattr_destroy failed");

      return 1;

    }

  puts ("going to fork now");

  pid = fork ();

  if (pid == -1)

    {

      puts ("fork failed");

      return 1;

    }

  /* Just to be sure we don't hang forever.  */

  alarm (4);

#define N 30

  for (cnt = 0; cnt < N; ++cnt)

    {

      int e;

      e = pthread_barrier_wait (b);

      if (e == PTHREAD_BARRIER_SERIAL_THREAD)

	++serials;

      else if (e != 0)

	{

	  printf ("%s: barrier_wait returned value %d != 0 and PTHREAD_BARRIER_SERIAL_THREAD\n",

		  pid == 0 ? "child" : "parent", e);

	  return 1;

	}

    }

  alarm (0);

  printf ("%s: was %d times the serial thread\n",

	  pid == 0 ? "child" : "parent", serials);

  if (pid == 0)

    /* The child.  Pass the number of times we had the serializing

       thread back to the parent.  */

    exit (serials);

  if (waitpid (pid, &status, 0) != pid)

    {

      puts ("waitpid failed");

      return 1;

    }

  if (!WIFEXITED (status))

    {

      puts ("child exited abnormally");

      return 1;

    }

  if (WEXITSTATUS (status) + serials != N)

    {

      printf ("total number of serials is %d, expected %d\n",

	      WEXITSTATUS (status) + serials, N);

      return 1;

    }

  return 0;

}

#define TEST_FUNCTION do_test ()

#include "../test-skeleton.c"