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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.  
  42. static void reader(void *arg)
  43. {
  44.     thread_detach(THREAD);
  45.    
  46.     TPRINTF("cpu%u, tid %" PRIu64 ": trying to lock rwlock for reading....\n", CPU->id, THREAD->tid);
  47.    
  48.     rwlock_read_lock(&rwlock);
  49.     rwlock_read_unlock(&rwlock);
  50.    
  51.     TPRINTF("cpu%u, tid %" PRIu64 ": success\n", CPU->id, THREAD->tid);
  52.     TPRINTF("cpu%u, tid %" PRIu64 ": trying to lock rwlock for writing....\n", CPU->id, THREAD->tid);
  53.    
  54.     rwlock_write_lock(&rwlock);
  55.     rwlock_write_unlock(&rwlock);
  56.    
  57.     TPRINTF("cpu%u, tid %" PRIu64 ": success\n", CPU->id, THREAD->tid);
  58.    
  59.     atomic_dec(&thread_count);
  60. }
  61.  
  62. char *test_rwlock3(void)
  63. {
  64.     int i;
  65.     thread_t *thrd;
  66.    
  67.     atomic_set(&thread_count, THREADS);
  68.    
  69.     rwlock_initialize(&rwlock);
  70.     rwlock_write_lock(&rwlock);
  71.    
  72.     for (i = 0; i < THREADS; i++) {
  73.         thrd = thread_create(reader, NULL, TASK, 0, "reader", false);
  74.         if (thrd)
  75.             thread_ready(thrd);
  76.         else
  77.             TPRINTF("Could not create reader %d\n", i);
  78.     }
  79.    
  80.     thread_sleep(1);
  81.     rwlock_write_unlock(&rwlock);
  82.    
  83.     while (atomic_get(&thread_count) > 0) {
  84.         TPRINTF("Threads left: %ld\n", atomic_get(&thread_count));
  85.         thread_sleep(1);
  86.     }
  87.    
  88.     return NULL;
  89. }
  90.