Ryan Ofsky c25a5e670b init: Signal m_tip_block_cv on Ctrl-C ...

Signal m_tip_block_cv when Ctrl-C is pressed or SIGTERM is received, the same
way it is currently signalled when the `stop` RPC is called. This lets RPC
calls like `waitforblockheight` and IPC calls like `waitTipChanged` be
interrupted, instead of waiting for their original timeouts and delaying
shutdown.

Historical notes:

- The behavior where `stop` RPC signals `m_tip_block_cv`, but CTRL-C does not,
  has been around since the condition variable was introduced in #30409
  (7eccdaf160).
- The signaling was later moved without changing behavior in #30967
  (5ca28ef28b). This commit moves it again to
  the Interrupt() function, which is probably the place it should have been
  added initially, so it works for Ctrl-C shutdowns as well as `stop`
  shutdowns.
- A Qt shutdown bug calling wait methods was fixed previously in #18452
  (da73f1513a), and this change updates that
  fix to avoid the hang happening again in Qt.

2025-10-01 13:00:33 -04:00

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