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#define IPC_MAX_PHONES  16

struct answerbox;

struct task;

typedef enum {

    IPC_PHONE_FREE = 0,     /**< Phone is free and can be allocated */

    IPC_PHONE_CONNECTING,   /**< Phone is connecting somewhere */

    IPC_PHONE_CONNECTED,    /**< Phone is connected */

    IPC_PHONE_HUNGUP,   /**< Phone is hung up, waiting for answers to come */

    IPC_PHONE_SLAMMED       /**< Phone was hungup from server */

} ipc_phone_state_t;

/** Structure identifying phone (in TASK structure) */

typedef struct {

    SPINLOCK_DECLARE(lock);

    link_t link;

    struct answerbox *callee;

    ipc_phone_state_t state;

    atomic_t active_calls;

} phone_t;

typedef struct answerbox {

    SPINLOCK_DECLARE(lock);

    struct task *task;

    waitq_t wq;

    link_t connected_phones;    /**< Phones connected to this answerbox */

    link_t calls;           /**< Received calls */

    link_t dispatched_calls;    /* Should be hash table in the future */

    link_t answers;         /**< Answered calls */

    SPINLOCK_DECLARE(irq_lock);

    link_t irq_notifs;          /**< Notifications from IRQ handlers */

    link_t irq_head;        /**< IRQs with notifications to this answerbox. */

} answerbox_t;