A node stores a word to offer on any of its ports and fetches the wait: it
is blocked until a word comes for it or one of its offers is taken, and
the fabric does the handing over in one step. The port block moves in
the nucleus's map to make room for the new addresses. Nothing uses it
yet. MESH.md 7c; plan step 6d task 1.
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>
A node writing to a node that was stuck, and was then killed, stayed
blocked for ever: killing a stuck node could cost its neighbours. And on
the hosted and bare-metal products a write to an empty port, 5 7 PORT!,
ended the program with "the node stopped".
Now a node that can take an error, blocked writing to or reading from one
port that nothing is wired to -- nothing ever was, or what was there has
been killed or the wire cut -- has error 18, No one on that port, raised
on it and goes on. A bare node waits as on the fabric; so does a node
whose neighbour is asleep, and one reading "any port".
test_host_unit.c: Hera kills node 14 while node 12 is blocked writing to
it. It failed first: 12 stayed blocked. test_fabric.c: a bare node still
waits. hosted-check types 5 7 PORT! and goes on; it failed first too.
make -C v4 test, sanitize and hosted-check pass; amd64, aarch64 and
riscv64 boot, POST 538 of 538, dict_hash 0x5f0a949a6fc8ef2b on all six:
logs/20261007-121743, -122008, -122337.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
MESH.md step 5, in the fabric under test; the products are still one
node each until steps 8 and 9.
manage.c: what Hera asks of whoever holds the fabric, eleven requests by
KERNEL-WORD -- NODE-ME -BORN -WIRE -UNWIRE -SLEEP -WAKE -KILL -PARITY and
CAPSULE-OPEN -CELL -LINE. Nucleus: PORT!, SEND-ON, AWAIT, (SEAL).
capsules/v4/hera.4th: BIRTH and UNIT, the unit rule in FORTH and nowhere
else. The dictionary hash moves to the engine (v4_image_dict_hash).
test_host_unit.c, 34 checks, 64-bit: Hera is born empty, takes the
nucleus through her port, FORTH-79, POST and her capsule; 10 UNIT; four
nodes are born, each takes the nucleus and FORTH-79 through its port from
Hera and passes POST 538/538; four parities, one dictionary hash; they
talk, and a message between two corners not wired goes by Hera.
All v4 tests at both widths and under ASan+UBSan. hosted-check on three
ISAs. Bare metal: logs/20261006-143934 (amd64), -144204 (aarch64),
-144601 (riscv64).
Open, recorded in MESH.md: not run at 32 bits; a node that never answers
leaves Hera waiting; the capsules are read from files in the test, not
from the baked directory.
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 1, in the engine, which knows nothing of StarForth or of any
kernel.
- node: V4_PORTS ports (8), a build parameter; "any port" and the port the
last such read came from; a read blocks until the neighbour writes, as a
write blocks until the neighbour reads; v4_node_born: empty, P at "any
port"
- exec: a fetch from a port -- @ @b @+ @p, or of an instruction word when P
is a port -- waits for a word; a node executes what arrives at a port
without advancing P; a blocked node goes on from the slot it stopped at
- fabric: the nodes there are and the table of how their ports are wired,
both changed while the nodes run; devices on a port; asleep and awake; a
step is every unblocked node executing one instruction word, then every
write with a reader waiting being handed over
- DECOMPOSITION.md section 6: four named ports withdrawn for V4_PORTS
numbered ones and wiring as data, as ruled
Verified: tests/test_fabric.c, 53 checks at both widths: two nodes exchange
words; an empty node is filled through its port by a device, and by another
node, and runs what it was sent; a word is passed on by a node in between;
a waiting node executes nothing; the wiring is changed while they run; a
node is put to sleep, woken and removed while looping; a node is born while
others run; the fabric is given more room. make -C v4 test and make -C v4
sanitize pass. The single-node products are unchanged: hosted-check on
three ISAs, and clean qemu with STARFORTH_V4=1 on amd64, aarch64 and
riscv64 with lines typed at each prompt (logs/20261006-074907, -075150,
-075532).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
