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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. static void reader(void *arg);
  49. static void failed(void);
  50.  
  51. void writer(void *arg)
  52. {
  53.     thread_detach(THREAD);
  54.  
  55.     waitq_sleep(&can_start);
  56.  
  57.     rwlock_write_lock(&rwlock);
  58.     atomic_inc(&items_written);
  59.     rwlock_write_unlock(&rwlock);
  60. }
  61.  
  62. void reader(void *arg)
  63. {
  64.     thread_detach(THREAD);
  65.  
  66.     waitq_sleep(&can_start);
  67.    
  68.     rwlock_read_lock(&rwlock);
  69.     atomic_inc(&items_read);
  70.     rwlock_read_unlock(&rwlock);
  71. }
  72.  
  73. void failed(void)
  74. {
  75.     printf("Test failed prematurely.\n");
  76.     thread_exit();
  77. }
  78.  
  79. void test(void)
  80. {
  81.     int i, j, k;
  82.     count_t readers, writers;
  83.    
  84.     printf("Read/write locks test #5\n");
  85.    
  86.     waitq_initialize(&can_start);
  87.     rwlock_initialize(&rwlock);
  88.    
  89.     for (i=1; i<=3; i++) {
  90.         thread_t *thrd;
  91.  
  92.         atomic_set(&items_read, 0);
  93.         atomic_set(&items_written, 0);
  94.  
  95.         readers = i*READERS;
  96.         writers = (4-i)*WRITERS;
  97.  
  98.         printf("Creating %ld readers and %ld writers...", readers, writers);
  99.        
  100.         for (j=0; j<(READERS+WRITERS)/2; j++) {
  101.             for (k=0; k<i; k++) {
  102.                 thrd = thread_create(reader, NULL, TASK, 0, "reader");
  103.                 if (thrd)
  104.                     thread_ready(thrd);
  105.                 else
  106.                     failed();
  107.             }
  108.             for (k=0; k<(4-i); k++) {
  109.                 thrd = thread_create(writer, NULL, TASK, 0, "writer");
  110.                 if (thrd)
  111.                     thread_ready(thrd);
  112.                 else
  113.                     failed();
  114.             }
  115.         }
  116.  
  117.         printf("ok\n");
  118.  
  119.         thread_sleep(1);
  120.         waitq_wakeup(&can_start, WAKEUP_ALL);
  121.    
  122.         while (items_read.count != readers || items_written.count != writers) {
  123.             printf("%zd readers remaining, %zd writers remaining, readers_in=%zd\n", readers - items_read.count, writers - items_written.count, rwlock.readers_in);
  124.             thread_usleep(100000);
  125.         }
  126.     }
  127.     printf("Test passed.\n");
  128. }
  129.