"The big thing will be seeing friends and family and the people who they were expecting to spend Christmas with," said Helen Sharman, Britain's first astronaut.
Paul does not know where he and his family will go next, but believes the chances of being able to live in neighbouring homes is slim.
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For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.