/* Test program for timedout read/write lock functions.

   Copyright (C) 2000-2018 Free Software Foundation, Inc.

   Contributed by Ulrich Drepper <drepper@redhat.com>, 2000.

   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; see the file COPYING.LIB.  If

   not, see <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <error.h>

#include <pthread.h>

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

#include <unistd.h>

#define NWRITERS 15

#define WRITETRIES 10

#define NREADERS 15

#define READTRIES 15

#define DELAY   1000000

#ifndef KIND

# define KIND PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP

#endif

static pthread_rwlock_t lock;

static void *

writer_thread (void *nr)

{

  struct timespec delay;

  int n;

  delay.tv_sec = 0;

  delay.tv_nsec = DELAY;

  for (n = 0; n < WRITETRIES; ++n)

    {

      printf ("writer thread %ld tries again\n", (long int) nr);

      if (pthread_rwlock_wrlock (&lock) != 0)

	{

	  puts ("wrlock failed");

	  exit (1);

	}

      printf ("writer thread %ld succeeded\n", (long int) nr);

      nanosleep (&delay, NULL);

      if (pthread_rwlock_unlock (&lock) != 0)

	{

	  puts ("unlock for writer failed");

	  exit (1);

	}

      printf ("writer thread %ld released\n", (long int) nr);

    }

  return NULL;

}

static void *

reader_thread (void *nr)

{

  struct timespec delay;

  int n;

  delay.tv_sec = 0;

  delay.tv_nsec = DELAY;

  for (n = 0; n < READTRIES; ++n)

    {

      printf ("reader thread %ld tries again\n", (long int) nr);

      if (pthread_rwlock_rdlock (&lock) != 0)

	{

	  puts ("rdlock failed");

	  exit (1);

	}

      printf ("reader thread %ld succeeded\n", (long int) nr);

      nanosleep (&delay, NULL);

      if (pthread_rwlock_unlock (&lock) != 0)

	{

	  puts ("unlock for reader failed");

	  exit (1);

	}

      printf ("reader thread %ld released\n", (long int) nr);

    }

  return NULL;

}

static int

do_test (void)

{

  pthread_t thwr[NWRITERS];

  pthread_t thrd[NREADERS];

  int n;

  void *res;

  pthread_rwlockattr_t a;

  if (pthread_rwlockattr_init (&a) != 0)

    {

      puts ("rwlockattr_t failed");

      exit (1);

    }

  if (pthread_rwlockattr_setkind_np (&a, KIND) != 0)

    {

      puts ("rwlockattr_setkind failed");

      exit (1);

    }

  if (pthread_rwlock_init (&lock, &a) != 0)

    {

      puts ("rwlock_init failed");

      exit (1);

    }

  /* Make standard error the same as standard output.  */

  dup2 (1, 2);

  /* Make sure we see all message, even those on stdout.  */

  setvbuf (stdout, NULL, _IONBF, 0);

  for (n = 0; n < NWRITERS; ++n)

    if (pthread_create (&thwr[n], NULL, writer_thread,

			(void *) (long int) n) != 0)

      {

	puts ("writer create failed");

	exit (1);

      }

  for (n = 0; n < NREADERS; ++n)

    if (pthread_create (&thrd[n], NULL, reader_thread,

			(void *) (long int) n) != 0)

      {

	puts ("reader create failed");

	exit (1);

      }

  /* Wait for all the threads.  */

  for (n = 0; n < NWRITERS; ++n)

    if (pthread_join (thwr[n], &res) != 0)

      {

	puts ("writer join failed");

	exit (1);

      }

  for (n = 0; n < NREADERS; ++n)

    if (pthread_join (thrd[n], &res) != 0)

      {

	puts ("reader join failed");

	exit (1);

      }

  return 0;

}

#define TIMEOUT 30

#define TEST_FUNCTION do_test ()

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