chrg6
ef2e5e24a6
Skip a change-event slot whose handle is not stored yet when a channel change signals the list.
...
The review of the one-event-per-kind change (E-11) found a narrow window kept from before: change_event_list counts a
slot (atomic_fetch_add on n_change_events) before it stores the handle there. audio_channels_live on the present path
running between the two read the slot's 0 and passed it to kern_event_signal, which ends the process with "not a
writable event handle". It needs a kind's first request to meet a channel-setting change.
change_event_list now stores the handle with release order, and audio_channels_live loads each slot with acquire order
and skips a slot that still reads 0; that slot's event is signalled by the next channel change.
Not reproduced before the change in a game run. tests/audio_mixer_check.c counts a slot without storing it and changes
the channels: no signal may reach handle 0, and the listed events are signalled again. Against the previous
audio_mixer.c it fails with handle 0 signalled once. The check passes, and the compile check of audio_mixer.c (also with
-Wall -Wextra) adds no warnings.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com >
2026-11-13 18:41:46 -05:00
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