https://gitlab.synchro.net/main/sbbs/-/commit/38865e18d8ecd696d31c692c
Modified Files:
src/conio/cg_cio.m cg_events.m sdl_con.c
Log Message:
Prevent backend calls during shutdown

Stop SDL user-event producers once video shutdown begins so the bitmap blinker cannot call into SDL after its event subsystem has been destroyed. Also make the Quartz lifecycle flags atomic across its application and main threads.

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