(GATE) offers a message's first word and sleeps until it is taken, taking
in whatever is written to the node meanwhile; (PAY) offers every refusal
owed at once, one to a port; a node that owes one sleeps in the wait.
Writing without looking, looking again and again, and the lower-number
rule are gone. Text from the console for a node whose own text waits to
begin a message ends that text Interrupted. The lone node's hosts serve
an offer as a write. MESH.md 7c; plan step 6d task 2.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The review of step 6c found it did not keep its rule. Ruled: fix them
all; 16 hops.
- Paying a NACK no longer waits on a lower-numbered neighbour; a node
that owes one does not sleep, and goes on taking in what it is sent.
- AWAIT looks first through the messages already waiting.
- A node waiting to write to a removed neighbour gets error 18: the
word that says who is reading also says which ports have anything on
them.
- A console line lets Hera go when she is blocked on the first word of
a message (v4_fabric_interrupt_error, a device's `pending`).
- A refused answer is told to the node that waits, not the one that
answered; one owed to the node itself goes to its own queue.
- A message is passed on by at most 16 nodes, then refused.
- A GONE is believed only when it says it is from the node's centre.
- Tests: the check that tested nothing is replaced; no room for a
waiting sender; the limit that remains is tested as a limit.
- MESH.md 7b's rule reworded to what holds, 7b.7 says where it falls
short; README likewise.
make -C v4 test, sanitize, hosted-check; three bare-metal boots. POST
538 of 538, word_count=317, dict_hash=0xc0769523a47b7dc3 on all six.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Text for a node from its console, arriving while the node waits for an
answer (AWAIT), is kept as any message is; the wait ends in error 21,
Interrupted; and the text is then done as usual. Console text for
another node, passing through a node that is waiting, does not end its
wait.
On the hosted program 5 AWAIT ended the program with "the node stopped".
The boot now reports that the line is waiting, the host reads the next
line and hands it over, which breaks the wait, and then has the kept line
done. The bare-metal host does the same; it is booted in the commit that
follows.
test_host_mesh.c: 76 checks, both widths and the sanitizers. hosted-check
types 5 AWAIT and two more lines: Interrupted, then 3 and 56.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A node that has no room for a message, or no way to pass it on, lets it
go and counts it as before, and now notes that it owes its sender a NACK
(type 4: the node the message was for). It sends what it owes when it
next has nothing else to do. 36 cells of the messages waiting are kept
for NACK and GONE, and nothing is owed for either.
A node sent a NACK counts it in (REFUSED); one waiting for an answer from
that node (AWAIT) stops, with error 19, Message refused. A GONE (type 5)
from a node's centre makes it forget the way to the node named (NO-ROUTE,
new), and ends a wait on it with error 20, Node gone. From anyone else
it is ignored. GONE ( n node -- ) sends one.
test_host_mesh.c, three nodes: text for a node nobody has a way to comes
back to the console, and to a node two away, as a NACK; a waiting sender's
line ends Message refused; a node that is waiting keeps what it has room
for, owes eight refusals, counts the rest, and sends them when its wait is
ended by a GONE from its centre. 70 checks, both widths, sanitizers.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
MESH.md step 4, the fault found there, as ruled (section 7a): a node
writes only to a neighbour that is reading, keeps what it takes in
meanwhile, and loses and counts what it has no room for.
Engine: two more addresses after a node's ports -- which ports have a
neighbour waiting to write to it, which to read from it. Nucleus: (GATE)
before every message; the messages waiting, a ring of 400 cells, dealt
with when the node is idle. Of two neighbours the lower number may wait
to write (ruled after it was built); NEIGHBOUR tells a node who is on
each port.
test_host_mesh.c, 44 checks: the case that stopped the nodes passes; six
messages from each node to each at once all arrive; 800 at once, the
nodes come to rest and every message arrived or was counted (287 arrived,
714 of all kinds let go). test_fabric.c: the two looks. Both widths,
ASan+UBSan.
POST: twelve cases handed HERE, a cell address on v4, to words that take
a byte address, and so wrote into or read from the nucleus's code at cell
HERE/4. Ruled: left out, marked OPEN, until HERE and the byte words are
made to agree as its own step. POST is 538 cases.
hosted-check on three ISAs, 538/538. Bare metal: logs/20261006-134817
(amd64), -135044 (aarch64), -135440 (riscv64).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
MESH.md step 4. Each node has a table of destinations and the port toward
each, and a port for everything else (ROUTE, DEFAULT-ROUTE, NO-ROUTES). A
message not for this node is passed on whole; one with nowhere to go is
dropped and counted. What text prints and how it ended go back to the node
it came from by the same table. SEND sends text to another node.
test_host_mesh.c: three StarForth nodes in a row behind a console, 28
checks at both widths and under ASan+UBSan. hosted-check on three ISAs.
Bare metal: logs/20261006-115225 (amd64), -115501 (aarch64), -115849
(riscv64).
NOT DONE. Two neighbours that write to each other at once wait for ever:
a write blocks until the neighbour reads, and a node that is writing is
not reading. The last check in test_host_mesh.c shows it (KNOWN FAULT).
MESH.md section 7a sets out the ways out; none is chosen.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
