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    /** Task is not being debugged */
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    /** Task is not being debugged */
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    UDEBUG_TS_INACTIVE,
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    UDEBUG_TS_INACTIVE,
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    /** BEGIN operation in progress (waiting for threads to stop) */
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    /** BEGIN operation in progress (waiting for threads to stop) */
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    UDEBUG_TS_BEGINNING,
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    UDEBUG_TS_BEGINNING,
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    /** Debugger fully connected */
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    /** Debugger fully connected */
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    UDEBUG_TS_ACTIVE,
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    UDEBUG_TS_ACTIVE
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    /** Task is shutting down, no more debug activities allowed */
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    UDEBUG_TS_SHUTDOWN
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} udebug_task_state_t;
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} udebug_task_state_t;
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/** Debugging part of task_t structure.
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/** Debugging part of task_t structure.
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 */
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 */
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typedef struct {
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typedef struct {
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} udebug_task_t;
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} udebug_task_t;
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/** Debugging part of thread_t structure.
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/** Debugging part of thread_t structure.
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 */
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 */
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typedef struct {
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typedef struct {
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    /**
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     * Prevent deadlock with udebug_before_thread_runs() in interrupt
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     * handler, without actually disabling interrupts.
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     * ==0 means "unlocked", >0 means "locked"
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     */
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    atomic_t int_lock;
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    /** Synchronize debug ops on this thread / access to this structure */
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    /** Synchronize debug ops on this thread / access to this structure. */
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    mutex_t lock;
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    mutex_t lock;
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    waitq_t go_wq;
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    waitq_t go_wq;
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    call_t *go_call;
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    call_t *go_call;
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    unative_t syscall_args[6];
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    unative_t syscall_args[6];
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    istate_t *uspace_state;
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    /** What type of event are we stopped in or 0 if none */
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    /** What type of event are we stopped in or 0 if none. */
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    udebug_event_t cur_event;  
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    udebug_event_t cur_event;
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    bool stop;
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    bool go;       /**< thread is GO */
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    bool stoppable;
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    bool stoppable;    /**< thread is stoppable */
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    bool debug_active; /**< In a debugging session */
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    bool debug_active; /**< thread is in a debugging session */
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} udebug_thread_t;
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} udebug_thread_t;
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struct task;
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struct task;
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struct thread;
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struct thread;
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void udebug_syscall_event(unative_t a1, unative_t a2, unative_t a3,
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void udebug_syscall_event(unative_t a1, unative_t a2, unative_t a3,
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    unative_t a4, unative_t a5, unative_t a6, unative_t id, unative_t rc,
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    unative_t a4, unative_t a5, unative_t a6, unative_t id, unative_t rc,
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    bool end_variant);
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    bool end_variant);
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void udebug_thread_b_event(struct thread *t);
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void udebug_thread_b_event_attach(struct thread *t, struct task *ta);
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void udebug_thread_e_event(void);
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void udebug_thread_e_event(void);
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void udebug_stoppable_begin(void);
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void udebug_stoppable_begin(void);
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void udebug_stoppable_end(void);
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void udebug_stoppable_end(void);
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