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feat(v4.0.0): the wait replaces looking and the console release; step 6d written up

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The engine's console release (v4_fabric_interrupt_error), a device's
pending, and the count of words since a look are removed: nothing uses
them.  MESH.md 4.1, 7b and 7c say what was built, where it differs from
what was approved and why, and what is still a limit; step 6d is marked
built, with the defects found on the way.

make -C v4 test and sanitize at both widths, hosted-check, lint; three
bare-metal boots.  POST 538 of 538, word_count=317,
dict_hash=0x6a39c0bb9d183418 on all six.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-08 01:24:09 -04:00
co-authored by Claude Opus 5.5
parent ec817a8264
commit 2b587206ee
13 changed files with 638 additions and 181 deletions
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v4/tests/test_fabric.c
-60
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@@ -70,10 +70,6 @@ static void count_for_ever(void)
v4_asm_branch(&as, V4_OP_JUMP, again);
}
/* a device that says whether it has something pending */
static int *dev_has;
static int device_has(void *self) { (void)self; return *dev_has; }
/* Let time pass until nothing more can happen, or `max` steps. */
static unsigned settle(unsigned max)
{
@@ -392,62 +388,6 @@ int main(void)
CHECK(ND(a)->n.asking && ND(a)->n.request == 5 && ND(c)->n.reading && ND(c)->n.mem[OUT] == 0, "looking takes nothing and gives nothing: both wait as they did");
CHECK(!ND(b)->n.stopped && ND(b)->n.reading, "and the one that looked did not wait to look");
/* ---- a node blocked on the first word of a message, while a device of its own has something for it ---- */
{
static int has; /* what the device says it has pending */
static stream none;
static v4_device dev;
v4_fabric_init(&f, places, 4);
for (i = 0; i < 3; i++) v4_node_reset(&pool[i].n);
a = loaded(0); /* looks about, then writes two words to its port 0 */
LIT(PB + (v4_cell)V4_PORTS + 3); O(BANG_B); O(FETCH_B); O(DROP);
LIT(PB + 0); O(BANG_B); LIT(1); O(STORE_B); LIT(2); O(STORE_B); wait_for_ever();
b = loaded(1); /* never reads */
LIT(OUT); O(BANG_A);
{
v4_cell again = v4_asm_label(&as);
O(FETCH_A); LIT(1); O(ADD); O(STORE_A);
v4_asm_branch(&as, V4_OP_JUMP, again);
}
CHECK(v4_asm_ok(&as) && v4_fabric_wire(&f, a, 0, b, 3), "a writer that looks first, wired to a node that never reads");
dev.take = stream_take; dev.give = 0; dev.self = &none; dev.pending = device_has; has = 1; dev_has = &has;
CHECK(v4_fabric_wire_device(&f, a, 5, &dev), "and to a device, which has something for it");
for (i = 0; i < 40; i++) (void)v4_fabric_step(&f);
CHECK(ND(a)->n.asking && ND(a)->n.request == 1 && v4_node_words_since_look(&ND(a)->n) == 0, "the writer is blocked on its first word, and waits: the fabric has no error for it");
v4_fabric_interrupt_error(&f, 21);
for (i = 0; i < 40; i++) (void)v4_fabric_step(&f);
CHECK(ND(a)->n.asking && ND(a)->n.faults == 0, "nor is a bare node let go when it has: it cannot take an error");
v4_node_error_attach(&ND(a)->n, OUT + 20);
v4_node_fault_attach(&ND(a)->n, 900);
has = 0;
for (i = 0; i < 40; i++) (void)v4_fabric_step(&f);
CHECK(ND(a)->n.asking && ND(a)->n.faults == 0, "a node that can take one waits all the same while the device has nothing for it");
has = 1;
(void)v4_fabric_step(&f);
CHECK(!ND(a)->n.asking && ND(a)->n.fault_kind == V4_FAULT_RAISED && ND(a)->n.fault_addr == 21 && ND(a)->n.mem[OUT + 20] == 21,
"when it has, the writer is let go and the error raised on it");
/* once the first word has gone, it is not let go: the message must be finished */
v4_fabric_init(&f, places, 4);
for (i = 0; i < 3; i++) v4_node_reset(&pool[i].n);
a = loaded(0);
LIT(PB + (v4_cell)V4_PORTS + 3); O(BANG_B); O(FETCH_B); O(DROP);
LIT(PB + 0); O(BANG_B); LIT(1); O(STORE_B); LIT(2); O(STORE_B); wait_for_ever();
b = loaded(1); /* reads one word, and no more */
LIT(PB + 3); O(BANG_B); O(FETCH_B); LIT(OUT); O(BANG_A);
{
v4_cell again = v4_asm_label(&as);
O(FETCH_A); LIT(1); O(ADD); O(STORE_A);
v4_asm_branch(&as, V4_OP_JUMP, again);
}
CHECK(v4_asm_ok(&as) && v4_fabric_wire(&f, a, 0, b, 3) && v4_fabric_wire_device(&f, a, 5, &dev), "the same, to a node that reads one word and no more");
v4_node_error_attach(&ND(a)->n, OUT + 20);
v4_node_fault_attach(&ND(a)->n, 900);
v4_fabric_interrupt_error(&f, 21);
for (i = 0; i < 60; i++) (void)v4_fabric_step(&f);
CHECK(ND(a)->n.asking && ND(a)->n.request == 2 && ND(a)->n.faults == 0, "blocked on its second word with the device still pending, the writer waits");
}
/* ---- the wait (MESH.md 7c): a node offers a word and sleeps ---- */
{
static stream none;