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ddebug: simplify watchdog loop and fix crash in the no-timeout case
The following race condition could occur in the no-timeout case:
API thread Gallium thread Watchdog
---------- -------------- --------
dd_before_draw
u_threaded_context draw
dd_after_draw
add to dctx->records
signal watchdog
dump & destroy record
execute draw
dd_after_draw_async
use-after-free!
Alternatively, the same scenario would assert in a debug build when
destroying the record because record->driver_finished has not signaled.
Fix this and simplify the logic at the same time by
- handing the record pointers off to the watchdog thread *before* each
draw call and
- waiting on the driver_finished fence in the watchdog thread
Reviewed-by: Marek Olšák <marek.olsak@amd.com>