- Host reader: the frame read and its handling are caught separately. Only the
read's I/O exceptions mean the pipe ended; anything HandleFrame's inline
completion work throws now kills that worker as ProtocolFault (outstanding
runs -> worker restarted / BadResourceUnavailable) instead of escaping a
dedicated thread (process crash) or being swallowed as a clean end (an
InvalidOperationException used to be, leaving the worker unread until a Crash
2 s later).
- Worker reader: the same catch-all around HandleFrame (exit ProtocolFault).
- Worker: Cancel() runs on the pool, so a script's blocking
ctx.CancellationToken callback cannot stop the worker reading its pipe.
- Host write-stall check: ScriptWorkerFrameWriter.WriteInProgressFor; the
heartbeat monitor kills a worker whose pipe write has been blocked longer than
max(10 s, silence limit) as KilledUnresponsive, which fails the write and
releases the producer (seam submit, deploy load, Cancel). Fixes the wrong
'heartbeat monitor ends it' comment on the pipe buffer quota.
- StopAsync sends Shutdown off the caller so its 1 s budget holds on a full pipe.
- WindowsBlockingPipeStream refuses the async surface (Stream's base versions
serialise a write behind a waiting read).
- Tests: PipeFaultTests (throwing completion callback -> ProtocolFault and a
BadResourceUnavailable sibling, shard serves again; a worker that stops reading
but heartbeats is killed within the bound and the blocked producer returns,
via the Hello.test_stall_reader_on_diag seam); BlockingPipeStreamTests dispose
with a write blocked on a full pipe, and with a read and a write both pending;
Category=ScriptWorker on the protocol, handshake and pipe test classes.
Mutation checks: no stall kill -> stall test red; catch-all without the fault
-> callback test red (Crash).
Claude-Session: https://claude.ai/code/session_01GT67AD99zQQqpLCVm3p7xk
#789 (partial, further tuning deferred): combining inline frame writer, buffered
frame reader, one timer per evaluation for T and T+G, slot release on the reader
before the caller resumes, a non-spinning per-connection result dispatcher, and
blocking pipe I/O on Unix (both ends) so the socket never enters the socket
engine; TerminateJobObject kill on Windows. macOS host CPU at 10k evals/s K=2:
228-240 % -> 79 % (InProcess 69 %, IPC share +10 vs budget 25); windev 153 % ->
123 % (+115, still a miss). Harness reports the "vs InProcess" share, warm-cache
worker RSS, and times kill latency from the soft-timeout answer.
#790: the worker sends LoadStarted; the compile timeout is armed then, so a load
queued behind other compiles is never killed or struck.
#788: one Error with stack per down period, rate-limited Warnings with attempt
count, one Information on recovery.
Design doc §8.2 notes + §12.2 record.
Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV
Joseph Doherty