Structure - Specifies a port's resource and message queue limits.
struct mach_port_limits { mach_port_msgcount_t queue_limit; }; typedef struct mach_port_limits* mach_port_limits_t;
The mach_port_limits structure defines various limits governing the messages that can be sent through the port. (In the current implementation, the structure maintains only a queue length limit.)
Functions: mach_port_get_attributes, mach_port_set_attributes.
Structures: mach_port_qos.