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-rw-r--r--docs/cloud9.md6
1 files changed, 5 insertions, 1 deletions
diff --git a/docs/cloud9.md b/docs/cloud9.md
index 6eb76238..8d4b6b44 100644
--- a/docs/cloud9.md
+++ b/docs/cloud9.md
@@ -21,7 +21,11 @@ turn with the core (`pardes.turn`) while the editor waits for input or is out
in a syscall. A request that would change a pane while the editor is mid-step
is parked with `Status.again` -- the engine parks reads, writes, opens,
truncations, clunks and removes -- and retried by `Runner.wakeAll` when the
-editor next rests. `src/9p_quic.zig` selects the existing `pardes-9p` ALPN for
+editor next rests. A read with nothing yet parks the same way, but is never
+retried for news: the core holds it (`ctlfs.hold`) and `answerHeld` answers
+it on its connection through `Conn.reply`'s engine, under the connection's
+lock and only while the engine still holds that tag parked, since cloud9 does
+not tell the backend about a Tflush. `src/9p_quic.zig` selects the existing `pardes-9p` ALPN for
cloud9's optional OpenSSL transport; QUIC still runs on the poll loop in
`src/9p_io.zig` on the editor's thread, since cloud9's QUIC adapter is
nonblocking-descriptor based rather than `std.Io` based.