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.
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A social media content creator was arrested Thursday after New York City police said he was one of a number of people who pelted officers with snow and ice during a massive snowball fight in Washington Square Park this week.