teknium1
3a001a4d7f
fix(tui-gateway): the hard-exit kill owns every foreground spawn and never blocks
...
Re-review findings on the foreground-process registry:
- Spawn vs exit races. A child spawned but not yet registered when the hard-exit kill ran, or a
command launched after the kill took its snapshot, survived under init. The hard-exit kill now
raises a one-way exit fence and waits (bounded) for spawns already past it to register; a spawn
refuses once the fence is up, and one that registers after a timed-out wait kills itself.
- The immediate kill fell back to proc.kill() for every handle. On Modal/Daytona/Vercel that is a
blocking SDK cancel (an 8s cancel made _hard_exit take 8s). Popen handles are still killed
inline (killpg, never blocks); every other handle's kill runs on a daemon thread under one
shared 0.5s deadline.
- The registry lock was a plain Lock: a signal landing on a thread that held it deadlocked the
exit. It is now an RLock (via a Condition) and the hard-exit path only takes it with a timeout,
falling back to a lock-free copy.
- The kanban worker's SIGALRM deadman os._exit()ed without the kill; it now goes through it.
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