9.1 Timers

(require web-server/private/timer)

"private/timer.ss" provides a functionality for running procedures after a given amount of time, that may be extended.

(struct   timer   (evt expire-seconds action))

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.

(start-timer-manager cust) → void

cust : custodian?

Handles the execution and management of timers. Resources are charged to cust.

(start-timer s action) → timer?

s : number?

action : (-> void)

Registers a timer that runs action after s seconds.

(reset-timer! t s) → void

t : timer?

s : number?

Changes t so that it will fire after s seconds.

(increment-timer! t s) → void

t : timer?

s : number?

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

(cancel-timer! t) → void

t : timer?

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