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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/waitq.h>
  36. #include <synch/rwlock.h>
  37.  
  38. #define READERS     50
  39. #define WRITERS     50
  40.  
  41. static rwlock_t rwlock;
  42.  
  43. static waitq_t can_start;
  44. static atomic_t items_read;
  45. static atomic_t items_written;
  46.  
  47. static void writer(void *arg)
  48. {
  49.     thread_detach(THREAD);
  50.  
  51.     waitq_sleep(&can_start);
  52.  
  53.     rwlock_write_lock(&rwlock);
  54.     atomic_inc(&items_written);
  55.     rwlock_write_unlock(&rwlock);
  56. }
  57.  
  58. static void reader(void *arg)
  59. {
  60.     thread_detach(THREAD);
  61.  
  62.     waitq_sleep(&can_start);
  63.    
  64.     rwlock_read_lock(&rwlock);
  65.     atomic_inc(&items_read);
  66.     rwlock_read_unlock(&rwlock);
  67. }
  68.  
  69. char * test_rwlock5(void)
  70. {
  71.     int i, j, k;
  72.     count_t readers, writers;
  73.    
  74.     waitq_initialize(&can_start);
  75.     rwlock_initialize(&rwlock);
  76.    
  77.     for (i = 1; i <= 3; i++) {
  78.         thread_t *thrd;
  79.  
  80.         atomic_set(&items_read, 0);
  81.         atomic_set(&items_written, 0);
  82.  
  83.         readers = i * READERS;
  84.         writers = (4 - i) * WRITERS;
  85.  
  86.         printf("Creating %ld readers and %ld writers...", readers, writers);
  87.        
  88.         for (j = 0; j < (READERS + WRITERS) / 2; j++) {
  89.             for (k = 0; k < i; k++) {
  90.                 thrd = thread_create(reader, NULL, TASK, 0, "reader");
  91.                 if (thrd)
  92.                     thread_ready(thrd);
  93.                 else
  94.                     printf("Could not create reader %d\n", k);
  95.             }
  96.             for (k = 0; k < (4 - i); k++) {
  97.                 thrd = thread_create(writer, NULL, TASK, 0, "writer");
  98.                 if (thrd)
  99.                     thread_ready(thrd);
  100.                 else
  101.                     printf("Could not create writer %d\n", k);
  102.             }
  103.         }
  104.  
  105.         printf("ok\n");
  106.  
  107.         thread_sleep(1);
  108.         waitq_wakeup(&can_start, WAKEUP_ALL);
  109.    
  110.         while ((items_read.count != readers) || (items_written.count != writers)) {
  111.             printf("%zd readers remaining, %zd writers remaining, readers_in=%zd\n", readers - items_read.count, writers - items_written.count, rwlock.readers_in);
  112.             thread_usleep(100000);
  113.         }
  114.     }
  115.    
  116.     return NULL;
  117. }
  118.