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51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
/*
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* SPDX-License-Identifier: MIT
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* Deadline-driven maintenance scheduling.
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*
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* maintenanceLoop() used to be driven by a fixed periodic tick (the 5 s
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* "housekeeping" timer). Every item inside it is really either a deadline
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* (AGC reset, CAD probe, advert timers, tempradio revert) or a sampler with
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* its own interval (noise floor) — nothing needs a poll. The msUntilNext*()
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* queries below let the event loop ask "when does maintenance next have work?"
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* and arm a single one-shot wake for exactly that moment, so an otherwise idle
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* node sleeps until its soonest real deadline instead of waking on a fixed
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* cadence.
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*
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* Contract: every msUntilNext*() returns milliseconds from now, 0 when work is
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* due right now, and MAINTENANCE_IDLE when the item has nothing pending at all.
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* Callers combine them with maintenanceSooner().
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*/
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#pragma once
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#include <stdint.h>
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namespace mesh {
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/* "No deadline pending." Deliberately not UINT32_MAX so that callers can add
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* a modest slack to a returned deadline without wrapping. */
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static const uint32_t MAINTENANCE_IDLE = 0x7FFFFFFFu;
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/* Fold one deadline into a running minimum. */
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static inline uint32_t maintenanceSooner(uint32_t a, uint32_t b)
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{
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return (a < b) ? a : b;
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}
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/* Milliseconds from now until `deadline` (a millisecond-clock timestamp),
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* saturating at 0 when it has already passed. Wrap-safe: the subtraction is
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* done in unsigned arithmetic and the sign is taken from the wrapped result,
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* matching Dispatcher::millisHasNowPassed(). */
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static inline uint32_t maintenanceUntil(uint32_t now_ms, uint32_t deadline_ms)
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{
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int32_t remaining = (int32_t)(deadline_ms - now_ms);
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if (remaining <= 0) {
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return 0;
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}
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return ((uint32_t)remaining < MAINTENANCE_IDLE) ? (uint32_t)remaining
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: MAINTENANCE_IDLE;
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}
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} /* namespace mesh */
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