introspection.h

void
dispatch_introspection_hook_queue_create(dispatch_queue_t queue);

void
dispatch_introspection_hook_queue_destroy(dispatch_queue_t queue);

void
dispatch_introspection_hook_queue_item_enqueue(dispatch_queue_t queue,
        dispatch_object_t item);

void
dispatch_introspection_hook_queue_item_dequeue(dispatch_queue_t queue,
        dispatch_object_t item);

void
dispatch_introspection_hook_queue_item_complete(dispatch_object_t item);

void
dispatch_introspection_hook_queue_callout_begin(dispatch_queue_t queue,
        void *_Nullable context, dispatch_function_t function);


void
dispatch_introspection_hook_queue_callout_end(dispatch_queue_t queue,
        void *_Nullable context, dispatch_function_t function);