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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.  
  37. #include <synch/waitq.h>
  38. #include <synch/semaphore.h>
  39. #include <synch/synch.h>
  40. #include <synch/spinlock.h>
  41.  
  42. static semaphore_t sem;
  43.  
  44. SPINLOCK_INITIALIZE(lock);
  45.  
  46. static waitq_t can_start;
  47.  
  48. __u32 seed = 0xdeadbeef;
  49.  
  50. static __u32 random(__u32 max);
  51.  
  52. static void consumer(void *arg);
  53. static void failed(void);
  54.  
  55. __u32 random(__u32 max)
  56. {
  57.     __u32 rc;
  58.  
  59.     spinlock_lock(&lock);  
  60.     rc = seed % max;
  61.     seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
  62.     spinlock_unlock(&lock);
  63.     return rc;
  64. }
  65.  
  66.  
  67. void consumer(void *arg)
  68. {
  69.     int rc, to;
  70.     waitq_sleep(&can_start);
  71.    
  72.     to = random(20000);
  73.     printf("cpu%d, tid %d down+ (%d)\n", CPU->id, THREAD->tid, to);
  74.     rc = semaphore_down_timeout(&sem, to);
  75.     if (SYNCH_FAILED(rc)) {
  76.         printf("cpu%d, tid %d down!\n", CPU->id, THREAD->tid);
  77.         return;
  78.     }
  79.    
  80.     printf("cpu%d, tid %d down=\n", CPU->id, THREAD->tid); 
  81.     thread_usleep(random(30000));
  82.    
  83.     semaphore_up(&sem);
  84.     printf("cpu%d, tid %d up\n", CPU->id, THREAD->tid);
  85. }
  86.  
  87. void failed(void)
  88. {
  89.     printf("Test failed prematurely.\n");
  90.     thread_exit();
  91. }
  92.  
  93. void test(void)
  94. {
  95.     __u32 i, k;
  96.    
  97.     printf("Semaphore test #2\n");
  98.    
  99.     waitq_initialize(&can_start);
  100.     semaphore_initialize(&sem, 5);
  101.    
  102.  
  103.    
  104.     for (; ;) {
  105.         thread_t *thrd;
  106.        
  107.         k = random(7) + 1;
  108.         printf("Creating %d consumers\n", k);
  109.         for (i=0; i<k; i++) {
  110.             thrd = thread_create(consumer, NULL, TASK, 0, "consumer");
  111.             if (thrd)
  112.                 thread_ready(thrd);
  113.             else
  114.                 failed();
  115.         }
  116.        
  117.         thread_usleep(20000);
  118.         waitq_wakeup(&can_start, WAKEUP_ALL);
  119.     }      
  120.  
  121. }
  122.