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  1. /*
  2.  * Copyright (c) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <test.h>
  30. #include <arch.h>
  31. #include <atomic.h>
  32. #include <print.h>
  33. #include <proc/thread.h>
  34.  
  35. #include <synch/rwlock.h>
  36.  
  37. #define READERS     50
  38. #define WRITERS     50
  39.  
  40. static rwlock_t rwlock;
  41. static bool sh_quiet;
  42.  
  43. static void writer(void *arg)
  44. {
  45.     if (!sh_quiet)
  46.         printf("Trying to lock rwlock for writing....\n");
  47.    
  48.     rwlock_write_lock(&rwlock);
  49.     rwlock_write_unlock(&rwlock);
  50.    
  51.     if (!sh_quiet)
  52.         printf("Trying to lock rwlock for reading....\n");
  53.    
  54.     rwlock_read_lock(&rwlock);
  55.     rwlock_read_unlock(&rwlock);   
  56. }
  57.  
  58. char * test_rwlock2(bool quiet)
  59. {
  60.     thread_t *thrd;
  61.     sh_quiet = quiet;
  62.    
  63.     rwlock_initialize(&rwlock);
  64.  
  65.     rwlock_read_lock(&rwlock);
  66.     rwlock_read_lock(&rwlock);
  67.     rwlock_read_lock(&rwlock);
  68.     rwlock_read_lock(&rwlock); 
  69.    
  70.     thrd = thread_create(writer, NULL, TASK, 0, "writer", false);
  71.     if (thrd)
  72.         thread_ready(thrd);
  73.     else
  74.         return "Could not create thread";
  75.  
  76.     thread_sleep(1);
  77.    
  78.     rwlock_read_unlock(&rwlock);
  79.     rwlock_read_unlock(&rwlock);
  80.     rwlock_read_unlock(&rwlock);
  81.     rwlock_read_unlock(&rwlock);
  82.    
  83.     thread_join(thrd);
  84.     thread_detach(thrd);
  85.    
  86.     return NULL;
  87. }
  88.