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[Fix] (Pipe): the device-loss debug knob re-arms when set to a new value.

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swung0x48
2026-10-02 23:59:55 -04:00
parent b06c2a9bf2
commit c60fcc17c5
3 changed files with 48 additions and 3 deletions
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MobileGL/MG_Pipe/PipeApply.cpp
+14 -1
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@@ -186,9 +186,22 @@ namespace MobileGL::MG_Pipe {
}
}
#endif
if (at <= 0) return false;
static std::atomic<long> armedAt{0};
static std::atomic<long> seen{0};
static std::atomic<bool> fired{false};
if (at <= 0) {
// Unset (or 0) disarms: the same value set again counts afresh.
if (armedAt.load(std::memory_order_relaxed) != 0) armedAt.store(0, std::memory_order_relaxed);
return false;
}
// A NEW VALUE RE-ARMS. One server process outlives many sessions, so a second loss is
// injected by setting the knob again (another value, or 0 and then a value): the count
// restarts from the checks made after it was seen.
if (long previous = armedAt.load(std::memory_order_acquire);
previous != at && armedAt.compare_exchange_strong(previous, at, std::memory_order_acq_rel)) {
seen.store(0, std::memory_order_release);
fired.store(false, std::memory_order_release);
}
if (fired.load(std::memory_order_acquire)) return false;
if (seen.fetch_add(1, std::memory_order_acq_rel) + 1 < at) return false;
if (fired.exchange(true, std::memory_order_acq_rel)) return false;