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[scheduler] Use integer math for interval offset calculation (#14755)

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This commit is contained in:
J. Nick Koston
2026-03-13 13:28:34 -10:00
committed by GitHub
parent 86b7933081
commit d6d3bbbad8
1 changed files with 4 additions and 3 deletions
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esphome/core/scheduler.cpp
+4 -3
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@@ -105,10 +105,11 @@ static void validate_static_string(const char *name) {
// avoid the main thread modifying the list while it is being accessed. // avoid the main thread modifying the list while it is being accessed.
// Calculate random offset for interval timers // Calculate random offset for interval timers
// Extracted from set_timer_common_ to reduce code size - float math + random_float() // Extracted from set_timer_common_ to reduce code size - only needed for intervals, not timeouts
// only needed for intervals, not timeouts
uint32_t Scheduler::calculate_interval_offset_(uint32_t delay) { uint32_t Scheduler::calculate_interval_offset_(uint32_t delay) {
return static_cast<uint32_t>(std::min(delay / 2, MAX_INTERVAL_DELAY) * random_float()); uint32_t max_offset = std::min(delay / 2, MAX_INTERVAL_DELAY);
// Multiply-and-shift: uniform random in [0, max_offset) without floating point
return static_cast<uint32_t>((static_cast<uint64_t>(random_uint32()) * max_offset) >> 32);
} }
// Check if a retry was already cancelled in items_ or to_add_ // Check if a retry was already cancelled in items_ or to_add_