- fiber states (RUNNABLE/PARKED/DONE), intrusive FIFO run queue,
wo_vm_spawn_fiber (calloc'd context, frame 0 set up like wo_vm_call)
- reduction budget: WO_REDUCTIONS (default 4000), checked at loop
BACK-EDGES AFTER the jump lands so the saved pc is the loop head —
a pre-instruction save at budget 1 re-executes the jump into the
same decrement and livelocks (found by reasoning, pinned by the
budget-1 test; deviation from the spec's three-site wording,
recorded in the yield macro's comment)
- FIBER_DONE: main returning ends the program and reaps every
remaining fiber through vm_unwind (drop maps run); a spawned fiber
ending frees silently; its return value is discarded by contract
- TRAPF: an uncaught trap in a spawned fiber kills that fiber ALONE
(stderr report, program lives); in main it stays the program's death
- WO_SYS_STOPPED reaps all fibers wherever it lands (main unlinked
from the queue and unwound if a spawned fiber caught the stop)
- vm_gc_roots walks the live fiber plus every queued one
- test_fiber (45 checks, ASan): EXACT round-robin interleave at budget
1 across three fibers pushing tags into one shared multi;
main-return reaps a spinning fiber holding an owned Big (ASan proves
the free); a DIV0 fiber dies alone, main answers 0
- full battery green: wovm-test, oop-e2e 89/0, woc-test, log-watcher
7/0, employee 8/0, web-app 21/0, deps-accept 8/0 (scheduler dormant
= one branch per back-edge)
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
shoney.arickathil
4f1b04d02d