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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 <arch/atomic.h>
  32. #include <print.h>
  33. #include <proc/thread.h>
  34. #include <arch/types.h>
  35. #include <arch/context.h>
  36. #include <panic.h>
  37.  
  38. #include <synch/waitq.h>
  39. #include <synch/rwlock.h>
  40. #include <synch/synch.h>
  41.  
  42. #define READERS     50
  43. #define WRITERS     50
  44.  
  45. static rwlock_t rwlock;
  46.  
  47. static spinlock_t lock;
  48.  
  49. static waitq_t can_start;
  50.  
  51. __u32 seed = 0xdeadbeaf;
  52.  
  53. static __u32 random(__u32 max);
  54.  
  55. static void writer(void *arg);
  56. static void reader(void *arg);
  57. static void failed(void);
  58.  
  59. __u32 random(__u32 max)
  60. {
  61.     __u32 rc;
  62.  
  63.     spinlock_lock(&lock);  
  64.     rc = seed % max;
  65.     seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
  66.     spinlock_unlock(&lock);
  67.     return rc;
  68. }
  69.  
  70.  
  71. void writer(void *arg)
  72. {
  73.     int rc, to;
  74.     waitq_sleep(&can_start);
  75.  
  76.     to = random(40000);
  77.     printf("cpu%d, tid %d w+ (%d)\n", CPU->id, THREAD->tid, to);
  78.     rc = rwlock_write_lock_timeout(&rwlock, to);
  79.     if (SYNCH_FAILED(rc)) {
  80.         printf("cpu%d, tid %d w!\n", CPU->id, THREAD->tid);
  81.         return;
  82.     };
  83.     printf("cpu%d, tid %d w=\n", CPU->id, THREAD->tid);
  84.  
  85.     if (rwlock.readers_in) panic("Oops.");
  86.     thread_usleep(random(1000000));
  87.     if (rwlock.readers_in) panic("Oops."); 
  88.  
  89.     rwlock_write_unlock(&rwlock);
  90.     printf("cpu%d, tid %d w-\n", CPU->id, THREAD->tid);
  91. }
  92.  
  93. void reader(void *arg)
  94. {
  95.     int rc, to;
  96.     waitq_sleep(&can_start);
  97.    
  98.     to = random(2000);
  99.     printf("cpu%d, tid %d r+ (%d)\n", CPU->id, THREAD->tid, to);
  100.     rc = rwlock_read_lock_timeout(&rwlock, to);
  101.     if (SYNCH_FAILED(rc)) {
  102.         printf("cpu%d, tid %d r!\n", CPU->id, THREAD->tid);
  103.         return;
  104.     }
  105.     printf("cpu%d, tid %d r=\n", CPU->id, THREAD->tid);
  106.     thread_usleep(30000);
  107.     rwlock_read_unlock(&rwlock);
  108.     printf("cpu%d, tid %d r-\n", CPU->id, THREAD->tid);    
  109. }
  110.  
  111. void failed(void)
  112. {
  113.     printf("Test failed prematurely.\n");
  114.     thread_exit();
  115. }
  116.  
  117. void test(void)
  118. {
  119.     context_t ctx;
  120.     __u32 i, k;
  121.    
  122.     printf("Read/write locks test #4\n");
  123.    
  124.     waitq_initialize(&can_start);
  125.     rwlock_initialize(&rwlock);
  126.    
  127.  
  128.    
  129.     for (; ;) {
  130.         thread_t *thrd;
  131.        
  132.         context_save(&ctx);
  133.         printf("sp=%X, readers_in=%d\n", ctx.sp, rwlock.readers_in);
  134.        
  135.         k = random(7) + 1;
  136.         printf("Creating %d readers\n", k);
  137.         for (i=0; i<k; i++) {
  138.             thrd = thread_create(reader, NULL, TASK, 0);
  139.             if (thrd)
  140.                 thread_ready(thrd);
  141.             else
  142.                 failed();
  143.         }
  144.  
  145.         k = random(5) + 1;
  146.         printf("Creating %d writers\n", k);
  147.         for (i=0; i<k; i++) {
  148.             thrd = thread_create(writer, NULL, TASK, 0);
  149.             if (thrd)
  150.                 thread_ready(thrd);
  151.             else
  152.                 failed();
  153.         }
  154.        
  155.         thread_usleep(20000);
  156.         waitq_wakeup(&can_start, WAKEUP_ALL);
  157.     }      
  158.  
  159. }
  160.