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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/rwlock.h>
  36.  
  37. #define THREADS 4
  38.  
  39. static atomic_t thread_count;
  40. static rwlock_t rwlock;
  41. static bool sh_quiet;
  42.  
  43. static void reader(void *arg)
  44. {
  45.     thread_detach(THREAD);
  46.    
  47.     if (!sh_quiet)
  48.         printf("cpu%d, tid %d: trying to lock rwlock for reading....\n", CPU->id, THREAD->tid);
  49.    
  50.     rwlock_read_lock(&rwlock);
  51.     rwlock_read_unlock(&rwlock);
  52.    
  53.     if (!sh_quiet) {
  54.         printf("cpu%d, tid %d: success\n", CPU->id, THREAD->tid);          
  55.         printf("cpu%d, tid %d: trying to lock rwlock for writing....\n", CPU->id, THREAD->tid);    
  56.     }
  57.  
  58.     rwlock_write_lock(&rwlock);
  59.     rwlock_write_unlock(&rwlock);
  60.    
  61.     if (!sh_quiet)
  62.         printf("cpu%d, tid %d: success\n", CPU->id, THREAD->tid);
  63.    
  64.     atomic_dec(&thread_count);
  65. }
  66.  
  67. char * test_rwlock3(bool quiet)
  68. {
  69.     int i;
  70.     thread_t *thrd;
  71.     sh_quiet = quiet;
  72.    
  73.     atomic_set(&thread_count, THREADS);
  74.    
  75.     rwlock_initialize(&rwlock);
  76.     rwlock_write_lock(&rwlock);
  77.    
  78.     for (i = 0; i < THREADS; i++) {
  79.         thrd = thread_create(reader, NULL, TASK, 0, "reader", false);
  80.         if (thrd)
  81.             thread_ready(thrd);
  82.         else if (!quiet)
  83.             printf("Could not create reader %d\n", i);
  84.     }
  85.  
  86.     thread_sleep(1);
  87.     rwlock_write_unlock(&rwlock);
  88.    
  89.     while (atomic_get(&thread_count) > 0) {
  90.         if (!quiet)
  91.             printf("Threads left: %d\n", atomic_get(&thread_count));
  92.         thread_sleep(1);
  93.     }
  94.    
  95.     return NULL;
  96. }
  97.