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static void reader(void *arg);
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static void reader(void *arg);
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static void failed(void *arg);
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static void failed(void *arg);
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void reader(void *arg)
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void reader(void *arg)
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{
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{
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    printf("cpu%d, tid %d: trying to lock rwlock for reading....\n", the->cpu->id, the->thread->tid);      
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    printf("cpu%d, tid %d: trying to lock rwlock for reading....\n", CPU->id, THREAD->tid);    
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    rwlock_read_lock(&rwlock);
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    rwlock_read_lock(&rwlock);
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    rwlock_read_unlock(&rwlock);   
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    rwlock_read_unlock(&rwlock);   
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    printf("cpu%d, tid %d: success\n", the->cpu->id, the->thread->tid);        
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    printf("cpu%d, tid %d: success\n", CPU->id, THREAD->tid);          
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    printf("cpu%d, tid %d: trying to lock rwlock for writing....\n", the->cpu->id, the->thread->tid);      
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    printf("cpu%d, tid %d: trying to lock rwlock for writing....\n", CPU->id, THREAD->tid);    
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    rwlock_write_lock(&rwlock);
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    rwlock_write_lock(&rwlock);
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    rwlock_write_unlock(&rwlock);
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    rwlock_write_unlock(&rwlock);
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    printf("cpu%d, tid %d: success\n", the->cpu->id, the->thread->tid);            
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    printf("cpu%d, tid %d: success\n", CPU->id, THREAD->tid);              
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    printf("Test passed.\n");  
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    printf("Test passed.\n");  
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}
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}
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    rwlock_initialize(&rwlock);
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    rwlock_initialize(&rwlock);
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    rwlock_write_lock(&rwlock);
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    rwlock_write_lock(&rwlock);
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    for (i=0; i<4; i++) {
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    for (i=0; i<4; i++) {
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        thrd = thread_create(reader, NULL, the->task, 0);
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        thrd = thread_create(reader, NULL, TASK, 0);
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        if (thrd)
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        if (thrd)
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            thread_ready(thrd);
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            thread_ready(thrd);
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        else
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        else
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            failed();
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            failed();
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    }
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    }