/* 
 * mutex4.c
 *
 *
 * Pthreads-win32 - POSIX Threads Library for Win32
 * Copyright (C) 1998 Ben Elliston and Ross Johnson
 * Copyright (C) 1999,2000,2001 Ross Johnson
 *
 * Contact Email: rpj@ise.canberra.edu.au
 *
 * This 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.
 *
 * This 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * --------------------------------------------------------------------------
 *
 * Thread A locks mutex - thread B tries to unlock.
 *
 * Depends on API functions: 
 *	pthread_mutex_lock()
 *	pthread_mutex_trylock()
 *	pthread_mutex_unlock()
 */

#include "test.h"

static int wasHere = 0;

static pthread_mutex_t mutex1;
 
void * unlocker(void * arg)
{
  int expectedResult = (int) arg;

  wasHere++;
  assert(pthread_mutex_unlock(&mutex1) == expectedResult);
  wasHere++;
  return NULL;
}
 
int
main()
{
  pthread_t t;
  pthread_mutexattr_t ma;

  assert(pthread_mutexattr_init(&ma) == 0);

  wasHere = 0;
  assert(pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_DEFAULT) == 0);
  assert(pthread_mutex_init(&mutex1, &ma) == 0);
  assert(pthread_mutex_lock(&mutex1) == 0);
  assert(pthread_create(&t, NULL, unlocker, (void *) 0) == 0);
  assert(pthread_join(t, NULL) == 0);
  assert(pthread_mutex_unlock(&mutex1) == EPERM);
  assert(wasHere == 2);

  wasHere = 0;
  assert(pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_NORMAL) == 0);
  assert(pthread_mutex_init(&mutex1, &ma) == 0);
  assert(pthread_mutex_lock(&mutex1) == 0);
  assert(pthread_create(&t, NULL, unlocker, (void *) 0) == 0);
  assert(pthread_join(t, NULL) == 0);
  assert(pthread_mutex_unlock(&mutex1) == EPERM);
  assert(wasHere == 2);

  wasHere = 0;
  assert(pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_ERRORCHECK) == 0);
  assert(pthread_mutex_init(&mutex1, &ma) == 0);
  assert(pthread_mutex_lock(&mutex1) == 0);
  assert(pthread_create(&t, NULL, unlocker, (void *) EPERM) == 0);
  assert(pthread_join(t, NULL) == 0);
  assert(pthread_mutex_unlock(&mutex1) == 0);
  assert(wasHere == 2);

  wasHere = 0;
  assert(pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_RECURSIVE) == 0);
  assert(pthread_mutex_init(&mutex1, &ma) == 0);
  assert(pthread_mutex_lock(&mutex1) == 0);
  assert(pthread_create(&t, NULL, unlocker, (void *) EPERM) == 0);
  assert(pthread_join(t, NULL) == 0);
  assert(pthread_mutex_unlock(&mutex1) == 0);
  assert(wasHere == 2);

  return 0;
}