// In a loop, this can exhaust connection pools
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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Tesco cut jobs in bakeries and phone shops last year
（四）未就原子能研究、开发和利用活动中影响公众利益的重大事项依法征求利益相关方意见的；