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