// Stateless transform — a pure function
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.
。51吃瓜对此有专业解读
骡子还没拉一根麦秆，就失足栽进一个6米深的坑里。五奶奶慌了神，在坑口哭得死去活来。那骡子值几千块钱，要是摔死在坑里，她赔不起。
Bulky and relatively heavy