Lennart Poettering
575b300b79
This fundamentally makes one change: we never process more than one signal or more than one waitid() event per event loop. We'll never tight loop around waitid() or around read() on our signalfd instead, but always return to the main event loop after processing one event. By doing this we put the event priorization handling into full power again, as we'll always check for higher priority events before looking at the next signal or waitid() again. This introduces a new "defer" event source "sigchld_event". It's enabled as soon as we see SIGCHLD, and disabled as soon as waitid() reported no further children pending. It's running at a relatively high priority, one step higher than signal handling itself, but lower than /proc/self/mountinfo event handling, so that the latter always takes precedence. Since we want to process sd_notify() events at an even higher priority than SIGCHLD (as before) it is moved one priority step up, too. Fixes: #7932 Possibly fixes: #7966
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