Exit function after specified time

hi,

im not sure if asked before, wondering if break function if function doesn't execute in 6 seconds.

basically function running calculate time takes magnet pass once on reed switch:

code: [select]

void tripuino::rech(unsigned long *timestart, unsigned long *timeend){
   while (digitalread(3) == high){
   }
   *timestart = millis();
   while (digitalread(3) == low){
   }
   while (digitalread(3) == high){
   }
   *timeend = millis();
}
i want function stop executing if takes longer 6 seconds indicate speed 0 in rest of code. need use interrupt or there way of achieving goal?

thanks in advance

you should move timestart declaration before first while loop. then, in each while loop, check condition , check (millis()) minus start time less 6 seconds.

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