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AlveElde authored
This commit introduces EXP_Reduce(), a function to reduce object timers. The goal is to provide a function better suited to soft-purging objects, as EXP_Rearm() has some non-obvious disadvantages when used or this purpose. When EXP_Rearm() is used to soft-purge an object by setting its TTL to 0, the expiry is effectively reset to the start of the objects grace period. This happens because the object TTL includes a time delta between object insertion time (oc->t_origin) and now. The result is that a soft-purge extends the lifetime of an already stale object, and repeated soft-purges can keep the object away from expiry indefinitely. The EXP_Reduce() function is better suited for soft-purging, as it only updates an objects TTL if it would reduce the objects lifetime. The function also has facilities for reducing grace and keep.
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