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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. #include <arch/types.h>
  35. #include <arch/context.h>
  36. #include <context.h>
  37. #include <panic.h>
  38.  
  39. #include <synch/waitq.h>
  40. #include <synch/rwlock.h>
  41. #include <synch/synch.h>
  42. #include <synch/spinlock.h>
  43.  
  44. #define READERS     50
  45. #define WRITERS     50
  46.  
  47. static rwlock_t rwlock;
  48.  
  49. SPINLOCK_INITIALIZE(rw_lock);
  50.  
  51. static waitq_t can_start;
  52.  
  53. static uint32_t seed = 0xdeadbeef;
  54.  
  55. static uint32_t random(uint32_t max)
  56. {
  57.     uint32_t rc;
  58.  
  59.     spinlock_lock(&rw_lock);   
  60.     rc = seed % max;
  61.     seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
  62.     spinlock_unlock(&rw_lock);
  63.     return rc;
  64. }
  65.  
  66. static void writer(void *arg)
  67. {
  68.     int rc, to;
  69.     thread_detach(THREAD);
  70.     waitq_sleep(&can_start);
  71.  
  72.     to = random(40000);
  73.     printf("cpu%d, tid %d w+ (%d)\n", CPU->id, THREAD->tid, to);
  74.     rc = rwlock_write_lock_timeout(&rwlock, to);
  75.     if (SYNCH_FAILED(rc)) {
  76.         printf("cpu%d, tid %d w!\n", CPU->id, THREAD->tid);
  77.         return;
  78.     }
  79.     printf("cpu%d, tid %d w=\n", CPU->id, THREAD->tid);
  80.  
  81.     if (rwlock.readers_in) panic("Oops.");
  82.     thread_usleep(random(1000000));
  83.     if (rwlock.readers_in) panic("Oops."); 
  84.  
  85.     rwlock_write_unlock(&rwlock);
  86.     printf("cpu%d, tid %d w-\n", CPU->id, THREAD->tid);
  87. }
  88.  
  89. static void reader(void *arg)
  90. {
  91.     int rc, to;
  92.     thread_detach(THREAD);
  93.     waitq_sleep(&can_start);
  94.    
  95.     to = random(2000);
  96.     printf("cpu%d, tid %d r+ (%d)\n", CPU->id, THREAD->tid, to);
  97.     rc = rwlock_read_lock_timeout(&rwlock, to);
  98.     if (SYNCH_FAILED(rc)) {
  99.         printf("cpu%d, tid %d r!\n", CPU->id, THREAD->tid);
  100.         return;
  101.     }
  102.     printf("cpu%d, tid %d r=\n", CPU->id, THREAD->tid);
  103.     thread_usleep(30000);
  104.     rwlock_read_unlock(&rwlock);
  105.     printf("cpu%d, tid %d r-\n", CPU->id, THREAD->tid);    
  106. }
  107.  
  108. char * test_rwlock4(void)
  109. {
  110.     context_t ctx;
  111.     uint32_t i, k;
  112.    
  113.     waitq_initialize(&can_start);
  114.     rwlock_initialize(&rwlock);
  115.    
  116.     thread_t *thrd;
  117.    
  118.     context_save(&ctx);
  119.     printf("sp=%#x, readers_in=%d\n", ctx.sp, rwlock.readers_in);
  120.    
  121.     k = random(7) + 1;
  122.     printf("Creating %d readers\n", k);
  123.     for (i = 0; i < k; i++) {
  124.         thrd = thread_create(reader, NULL, TASK, 0, "reader");
  125.         if (thrd)
  126.             thread_ready(thrd);
  127.         else
  128.             printf("Could not create reader %d\n", i);
  129.     }
  130.  
  131.     k = random(5) + 1;
  132.     printf("Creating %d writers\n", k);
  133.     for (i=0; i<k; i++) {
  134.         thrd = thread_create(writer, NULL, TASK, 0, "writer");
  135.         if (thrd)
  136.             thread_ready(thrd);
  137.         else
  138.             printf("Could not create writer %d\n", i);
  139.     }
  140.    
  141.     thread_usleep(20000);
  142.     waitq_wakeup(&can_start, WAKEUP_ALL);
  143.    
  144.     return NULL;
  145. }
  146.