If you want a busy loop, just comment out the sleep line.

This would not fulfil the requirement that at most three service calls must be done. For doing this, you also have to monitor the time (though you don't have to do it using a timer).

Application where I would do a busy loop instead of using a sleep:

• I'm running on a system where Time::HiRes is not available
• I'm running on a system where there isn't going on much more critical stuff except my process, so I don't care eating CPU cycles by a busy loop
• I find that doing one service call in average takes 0.3 seconds or longer, so I don't consider it worth saving cycles by doing micro-sleeps

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