agra da7dd1f1e7 fix: harden Phase 0/1 per adversarial review (sched.sx) ...

Addresses the review of 2f2d7f1d + 5c30bfe0:

- arm_timer: add the null-`current` guard its siblings (sleep/suspend_self/
  block_on_fd) all have. Armed from the bare scheduler context it stored a
  `fiber = null` Timer that segfaulted `wake` on fire; now it aborts loudly.
- spawn_raw: bail loudly on a null `entry` (a null fn-ptr jumped to 0x0 once
  the fiber ran), and document the `arg` lifetime contract (must outlive the
  fiber's first run, not just the spawn_raw call).
- poll: abort if io-waiters are pending (a `poll`-only driver can't progress
  fd-bound fibers — previously returned -1, indistinguishable from quiescent),
  and document `deadline_ms` as reserved/intentionally-unread for the
  virtual-time single-step (not a silently-dropped arg).
- fib_dispatch: replace the now-stale comment (which still claimed fibers run
  under `__sx_default_context` and "do not inherit a caller-scoped allocator")
  with the Phase 0 reality + the dctx lifetime contract: every capability in
  the spawn-time context (allocator/io/data) must outlive the fiber.

Behavior-preserving (full suite 828/0); the new aborts only fire on misuse.

2026-06-27 07:08:43 +03:00

61 KiB

Raw Blame History

View Raw