5.1 Timers
| (require web-server/private/timer) | package: web-server-lib |
This module provides a functionality for running
procedures after a given amount of time, that may be extended.
procedure
(timer-manager? x) → boolean?
x : any/c
Determines if x is a timer manager.
struct
(struct timer (tm evt expire-seconds action) #:extra-constructor-name make-timer) tm : timer-manager? 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
Handles the execution and management of timers.
procedure
(start-timer tm s action) → timer?
tm : timer-manager? 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.