ed 87c60a1ec9 ensure OS signals hit main-thread as intended; ...

use sigmasks to block SIGINT, SIGTERM, SIGUSR1 from all other threads

also initiate shutdown by calling sighandler directly,
in case this misses anything and that is still unreliable
(discovered by `--exit=idx` being noop once in a blue moon)

2024-05-09 22:28:16 +00:00

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