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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.  
  38. #include <synch/waitq.h>
  39. #include <synch/rwlock.h>
  40. #include <synch/synch.h>
  41. #include <synch/spinlock.h>
  42.  
  43. #define READERS     50
  44. #define WRITERS     50
  45.  
  46. static atomic_t thread_count;
  47. static rwlock_t rwlock;
  48. static atomic_t threads_fault;
  49. static bool sh_quiet;
  50.  
  51. SPINLOCK_INITIALIZE(rw_lock);
  52.  
  53. static waitq_t can_start;
  54.  
  55. static uint32_t seed = 0xdeadbeef;
  56.  
  57. static uint32_t random(uint32_t max)
  58. {
  59.     uint32_t rc;
  60.  
  61.     spinlock_lock(&rw_lock);   
  62.     rc = seed % max;
  63.     seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
  64.     spinlock_unlock(&rw_lock);
  65.     return rc;
  66. }
  67.  
  68. static void writer(void *arg)
  69. {
  70.     int rc, to;
  71.     thread_detach(THREAD);
  72.     waitq_sleep(&can_start);
  73.  
  74.     to = random(40000);
  75.    
  76.     if (!sh_quiet)
  77.         printf("cpu%d, tid %d w+ (%d)\n", CPU->id, THREAD->tid, to);
  78.    
  79.     rc = rwlock_write_lock_timeout(&rwlock, to);
  80.     if (SYNCH_FAILED(rc)) {
  81.         if (!sh_quiet)
  82.             printf("cpu%d, tid %d w!\n", CPU->id, THREAD->tid);
  83.         atomic_dec(&thread_count);
  84.         return;
  85.     }
  86.    
  87.     if (!sh_quiet)
  88.         printf("cpu%d, tid %d w=\n", CPU->id, THREAD->tid);
  89.  
  90.     if (rwlock.readers_in) {
  91.         if (!sh_quiet)
  92.             printf("Oops.");
  93.         atomic_inc(&threads_fault);
  94.         atomic_dec(&thread_count);
  95.         return;
  96.     }
  97.     thread_usleep(random(1000000));
  98.     if (rwlock.readers_in) {
  99.         if (!sh_quiet)
  100.             printf("Oops.");   
  101.         atomic_inc(&threads_fault);
  102.         atomic_dec(&thread_count);
  103.         return;
  104.     }
  105.  
  106.     rwlock_write_unlock(&rwlock);
  107.    
  108.     if (!sh_quiet)
  109.         printf("cpu%d, tid %d w-\n", CPU->id, THREAD->tid);
  110.     atomic_dec(&thread_count);
  111. }
  112.  
  113. static void reader(void *arg)
  114. {
  115.     int rc, to;
  116.     thread_detach(THREAD);
  117.     waitq_sleep(&can_start);
  118.    
  119.     to = random(2000);
  120.    
  121.     if (!sh_quiet)
  122.         printf("cpu%d, tid %d r+ (%d)\n", CPU->id, THREAD->tid, to);
  123.    
  124.     rc = rwlock_read_lock_timeout(&rwlock, to);
  125.     if (SYNCH_FAILED(rc)) {
  126.         if (!sh_quiet)
  127.             printf("cpu%d, tid %d r!\n", CPU->id, THREAD->tid);
  128.         atomic_dec(&thread_count);
  129.         return;
  130.     }
  131.    
  132.     if (!sh_quiet)
  133.         printf("cpu%d, tid %d r=\n", CPU->id, THREAD->tid);
  134.    
  135.     thread_usleep(30000);
  136.     rwlock_read_unlock(&rwlock);
  137.    
  138.     if (!sh_quiet)
  139.         printf("cpu%d, tid %d r-\n", CPU->id, THREAD->tid);
  140.     atomic_dec(&thread_count);
  141. }
  142.  
  143. char * test_rwlock4(bool quiet)
  144. {
  145.     context_t ctx;
  146.     uint32_t i;
  147.     sh_quiet = quiet;
  148.    
  149.     waitq_initialize(&can_start);
  150.     rwlock_initialize(&rwlock);
  151.     atomic_set(&threads_fault, 0);
  152.    
  153.     uint32_t rd = random(7) + 1;
  154.     uint32_t wr = random(5) + 1;
  155.    
  156.     atomic_set(&thread_count, rd + wr);
  157.    
  158.     thread_t *thrd;
  159.    
  160.     context_save(&ctx);
  161.     if (!quiet) {
  162.         printf("sp=%#x, readers_in=%d\n", ctx.sp, rwlock.readers_in);
  163.         printf("Creating %d readers\n", rd);
  164.     }
  165.    
  166.     for (i = 0; i < rd; i++) {
  167.         thrd = thread_create(reader, NULL, TASK, 0, "reader", false);
  168.         if (thrd)
  169.             thread_ready(thrd);
  170.         else if (!quiet)
  171.             printf("Could not create reader %d\n", i);
  172.     }
  173.  
  174.     if (!quiet)
  175.         printf("Creating %d writers\n", wr);
  176.    
  177.     for (i = 0; i < wr; i++) {
  178.         thrd = thread_create(writer, NULL, TASK, 0, "writer", false);
  179.         if (thrd)
  180.             thread_ready(thrd);
  181.         else if (!quiet)
  182.             printf("Could not create writer %d\n", i);
  183.     }
  184.    
  185.     thread_usleep(20000);
  186.     waitq_wakeup(&can_start, WAKEUP_ALL);
  187.    
  188.     while (atomic_get(&thread_count) > 0) {
  189.         if (!quiet)
  190.             printf("Threads left: %d\n", atomic_get(&thread_count));
  191.         thread_sleep(1);
  192.     }
  193.    
  194.     if (atomic_get(&threads_fault) == 0)
  195.         return NULL;
  196.    
  197.     return "Test failed";
  198. }
  199.