klipse-clj.lang.clojure.guard — viebel/klipse-clj 7.5.2

The basic idea is that the first time a klipse snippet's cljs is evaluated, we kick off a go-loop whose job is to wake up every 100ms and update watchdog-tick to say: this is the last time that i woke up!

And if (guard) gets run and notices that the watchdog hasn't been able to wake up within the last max-eval-duration milliseconds, it decides that we should kill the currently evaluating function, and does that by throwing an error.

and this doesn't kill go-loops created by users' snippet code, because those go-loops won't block the watchdog from running.

*watchdog-tick* cljs

each time the watchdog has a chance to run, this var is set with the current time

guard cljs

(guard max-eval-duration)

min-max-eval-duration cljs

my-emits cljs

(my-emits max-eval-duration & xs)

same as cljs.compiler/emits with insertion of a guard() call before if and recur (emitted as continue) statement.

Limitations:

1. It doesn't prevent infinite loop in imported code e.g. (reduce + (range)

run-watchdog* cljs

(run-watchdog*)

reset the watchdog-tick to the current time once in a while

run-watchdog-once cljs

runonce cljs

(runonce f)

tick cljs

(tick)

watchdog cljs

(watchdog)

watchdog-period cljs

The number of msec for the watchdog period. This value has to be much lower than min-max-eval-duration.