Aliaksandr Kalenik ceaeea3c26 RequestServer: Use write notifier instead of busy waiting for socket ...

...to become writable.

Solves triangular deadlock problem that happened in the following case
(copied from https://github.com/LadybirdBrowser/ladybird/issues/1816):
- The WebContent process is spinning on
   `send_sync_but_allow_failure` waiting for the UI process to respond
- The UI process is spinning on `send_sync_but_allow_failure`, waiting
   for RequestServer to respond
- RequestServer is stuck in this loop, trying to write to the
  WebContent's socket file (when I attach to RS, we are always in the
  sched_yield call, so we're spinning on EAGAIN).

For me the issue was reliably reproducible on Google Maps and with this
change we no longer deadlock there.

2025-05-24 16:28:48 +03:00

34 KiB

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