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RT_TIMER (9) NetBSD Kernel Developer’s Manual RT_TIMER (9)NAMErt_timer, rt_timer_add, rt_timer_queue_create, rt_timer_queue_change,rt_timer_queue_destroy, rt_timer_remove_all —route callout functionsSYNOPSIS#include struct rttimer_queue ∗rt_timer_queue_create(time_t timeout);voidrt_timer_queue_change(struct rttimer_queue ∗q , time_t timeout);voidrt_timer_queue_destroy(struct rttimer_queue ∗q , int destroy);intrt_timer_add(struct rtentry ∗rt ,void(∗f)(struct rtentry ∗, struct rttimer ∗) ,struct rttimer_queue ∗q);voidrt_timer_remove_all(struct rtentry ∗rt);DESCRIPTIONThe rt_timer functions provide a generic route callout functionality. They allow afunction to be calledfor a route at any time. This was originally intended to be used to remove routes added by path MTU discoverycode.For maximum efficiency, a separate queue should be defined for each timeout period. For example, onequeue should be created for the 10 minute path MTU discovery timeouts, another for 20 minute ARP timeoutsafter 20 minutes, and so on. This permits extremely fast queue manipulations so that the timeout functionsremain scalable, even inthe face of thousands of route manipulations per minute.It is possible to create only a single timeout queue for all possible timeout values, but doing so is not scalableas queue manipulations become quite expensive if the timeout deltas are not roughly constant.The rt_timer interface provides the following functions:rt_timer_queue_create(time_t timeout)This function creates a new timer queue with the specified timeout period timeout, expressedin seconds.rt_timer_queue_change(rttimer_queue ∗q , time_t timeout)This function modifies the timeout period for a timer queue. Any value, including 0, is valid.The next time the timer queue’s timeout expires (based on the previous timeout value), all entrieswhich are valid to execute based on the new timeout will be executed, and the new timeout periodscheduled.rt_timer_queue_destroy(rttimer_queue ∗q , int destroy)This function destroys a timeout queue. All entries are removed, and if the destroy argumentis non-zero, the timeout action is performed for each entry.rt_timer_add(struct rtentry ∗rt , void(∗f)(struct rtentry ∗, struct rttimer∗) , struct rttimer_queue ∗q)This function adds an entry to a timeout queue. The function f will be called after the timeoutperiod for queue q has elapsed. If f is NULL the route will be deleted when the timeout expires.NetBSD 3.0 April 23, 1998 1
RT_TIMER (9) NetBSD Kernel Developer’s Manual RT_TIMER (9)rt_timer_remove_all(struct rtentry ∗rt)This function removes all references to the given route from the rt_timer subsystem. This isused when a route is deleted to ensure that no dangling references remain.SEE ALSOnetstat(1), arp(9)AUTHORSThis interface is roughly based on (but, alas, not compatible with) one designed by David Borman of BSDI.This implementation is by Kevin Lahey ofthe Numerical Aerospace Simulation Facility, NASA AmesResearch Center.CODE REFERENCESThe rt_timer interface is implemented in sys/net/route.h and sys/net/route.c.HISTORYThe rt_timer interface appeared in NetBSD 1.4.NetBSD 3.0 April 23, 1998 2
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