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typedef void (* timeout_handler_t)(void *arg);

typedef struct {

    SPINLOCK_DECLARE(lock);

    link_t link;            /**< Link to the list of active timeouts on THE->cpu */

    uint64_t ticks;         /**< Timeout will be activated in this amount of clock() ticks. */

    timeout_handler_t handler;  /**< Function that will be called on timeout activation. */

    void *arg;          /**< Argument to be passed to handler() function. */

    cpu_t *cpu;         /**< On which processor is this timeout registered. */

} timeout_t;

/** Thread states. */

typedef enum {

    Invalid,    /**< It is an error, if thread is found in this state. */

    Running,    /**< State of a thread that is currently executing on some CPU. */

    Sleeping,   /**< Thread in this state is waiting for an event. */

    Ready,      /**< State of threads in a run queue. */

    Entering,   /**< Threads are in this state before they are first readied. */

    Exiting,    /**< After a thread calls thread_exit(), it is put into Exiting state. */

    Undead      /**< Threads that were not detached but exited are in the Undead state. */

} state_t;

/** Join types. */

typedef enum {

    None,

    TaskClnp,   /**< The thread will be joined by ktaskclnp thread. */

    TaskGC      /**< The thread will be joined by ktaskgc thread. */

} thread_join_type_t;