This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
So it means you have to wait for logging to complete before going on to the next line of your code. If you find that logging is slow - perhaps it sends emails or writes to databases - you might think that's a problem.
Then you'd be interested in asynchronous logging that moves the slow parts to another thread so you can return something to the user sooner. Message queuing is a common solution here.
A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi