5.1 Timers

This module provides a functionality for running procedures after a given amount of time, that may be extended.

struct
(struct timer (evt expire-seconds action)
#:extra-constructor-name make-timer)
  evt : evt?
  expire-seconds : number?
  action : (-> void)

evt is an alarm-evt that is ready at expire-seconds. action should be called when this evt is ready.

procedure
(start-timer-manager) → void

Handles the execution and management of timers.

procedure
(start-timer s action) → timer?
s : number?
action : (-> void)

Registers a timer that runs action after s seconds.

procedure
(reset-timer! t s) → void
t : timer?
s : number?

Changes t so that it will fire after s seconds.

procedure
(increment-timer! t s) → void
t : timer?
s : number?

Changes t so that it will fire after s seconds from when it does now.

procedure
(cancel-timer! t) → void
t : timer?

Cancels the firing of t ever and frees resources used by t.