[Client] Detect main-thread event loop stalls (#7155)

* [Client] Detect main-thread event loop stalls

LagMonitor ticks the GUI event loop every 500 ms and records gaps
beyond 2 s as stalls, warning with their duration and keeping a
bounded ring of recent records for diagnostics. Measurement uses a
monotonic QElapsedTimer so wall-clock steps and suspend do not
fabricate stalls. Recorded timestamps stay in wall time for
correlating with user reports.

Took 1 minute

Took 13 minutes


Took 2 minutes

* [Client] Rename LagMonitor constants to SCREAMING_SNAKE_CASE

Took 15 minutes

* [Client] Discard suspend-spanning gaps in LagMonitor

Windows counts sleep time in its monotonic clock, so a suspend would
fabricate one bogus stall per resume. Reset the clock on application
state changes and drop implausibly huge gaps; extract recordGap() for
testability.

Took 3 minutes

* [Client] Unit test LagMonitor stall recording

Drives recordGap() directly to cover the threshold, plausibility cap,
trim, and clear behavior without timing-dependent waits.

Took 36 seconds

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>
This commit is contained in:
BruebachL 2026-08-23 00:53:40 +02:00 committed by GitHub
parent b91e872f5f
commit 88aa036f7e
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@ -15,6 +15,7 @@ set(cockatrice_SOURCES
src/client/network/update/client/client_update_checker.cpp
src/client/network/update/client/release_channel.cpp
src/client/network/update/card_spoiler/spoiler_background_updater.cpp
src/client/lag_monitor.cpp
src/client/sound_engine.cpp
src/client/settings/cache_settings.cpp
src/client/settings/card_counter_settings.cpp