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Rev 955 Rev 959
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    spinlock_lock(&box->lock);
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    spinlock_lock(&box->lock);
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    list_remove(&phone->list);
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    list_remove(&phone->list);
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    spinlock_unlock(&box->lock);
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    spinlock_unlock(&box->lock);
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}
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}
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/** Helper function to facilitate synchronous calls */
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void ipc_call_sync(phone_t *phone, call_t *request)
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{
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    answerbox_t sync_box;
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    ipc_answerbox_init(&sync_box);
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    /* We will receive data on special box */
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    request->callerbox = &sync_box;
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    ipc_call(phone, request);
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    ipc_wait_for_call(&sync_box, 0);
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}
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/** Send a request using phone to answerbox
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/** Send a asynchronous request using phone to answerbox
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 *
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 *
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 * @param phone Phone connected to answerbox
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 * @param phone Phone connected to answerbox
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 * @param request Request to be sent
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 * @param request Request to be sent
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 */
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 */
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void ipc_call(phone_t *phone, call_t *request)
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void ipc_call(phone_t *phone, call_t *request)
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    printf("Phone company started.\n");
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    printf("Phone company started.\n");
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    while (1) {
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    while (1) {
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        call = ipc_wait_for_call(&TASK->answerbox, 0);
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        call = ipc_wait_for_call(&TASK->answerbox, 0);
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        printf("Received phone call - %P %P\n",
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        printf("Received phone call - %P %P\n",
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               call->data[0], call->data[1]);
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               call->data[0], call->data[1]);
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        call->data[0] = 0xbabaaaee;;
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        call->data[1] = 0xaaaaeeee;
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        ipc_answer(&TASK->answerbox, call);
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        ipc_answer(&TASK->answerbox, call);
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        printf("Call answered.\n");
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        printf("Call answered.\n");
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    }
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    }
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}
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}
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