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The post-core_run product block called into four translation units
every frame to find out nothing needed doing: cheat_manager_apply_
retro_cheats() loads a cold global to see there is no cheat list,
presence_update() calls discord_update() and steam_update_presence()
which each compare a status word and return, the camera poll reads
settings_t for camera_allow before the caps check, and
bsv_movie_next_frame() pulled two settings through config_get_ptr()
before checking whether a movie handle exists at all.
Give each an up/down owner and a bit on runloop_state_t::frame_work,
raised and dropped by the product itself through
runloop_frame_work_set():
RUNLOOP_WORK_CHEATS - cheat_manager_new/realloc raise it when a
list is allocated, cheat_manager_free drops it
RUNLOOP_WORK_PRESENCE - raised with Discord init and with Steam
(mist) init; dropped with whichever of the
two is the last compiled-in sink
RUNLOOP_WORK_CAMERA - driver_camera_start raises it when the core's
start succeeds, driver_camera_stop and the
driver teardown drop it. The remaining
camera_allow/caps/driver checks stay behind
the bit; a camera the core registered but
never started is no longer polled.
BSV needs no bit: the movie handles live on input_st, which the frame
already has in cache, so the iterate tests the pointers directly and
bsv_movie_next_frame() checks its handle before touching settings.