** This function can be called during a signal, under "reasonable" ** assumptions. ** Fields 'basehookcount' and 'hookcount' (set by 'resethookcount') ** are for debug only, and it is no problem if they get arbitrary ** values (causes at most one wrong hook call). 'hookmask' is an atomic ** value. We assume that pointers are atomic too (e.g., gcc ensures that ** for all platforms where it runs). M
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