ruby - Perform a loop for a certain time interval or while condition is met -

i trying have check fire off every second 30 seconds. haven't found clear way ruby yet. trying currently:

until counter == 30   sleep 1   if condition         break    else      counter +=1 end 

problem has use sleep, stops thread in tracks full second. there way achieve similar above without use of sleep? there way have cycle though on time based interval?

you can approximate you're looking along these lines:

now = time.now counter = 1 loop   if time.now < + counter     next   else     puts "counting second ..."   end   counter += 1   break if counter > 30 end