agra 95bedf726d docs: file issue 0193 — linux fiber-runtime port WIP + wrapped-asm drop ...

Port of std/sched.sx (the M:1 fiber runtime) to aarch64-linux. The epoll
bindings + std.event.Loop epoll backend are already committed and runtime-
validated (cc137002); this records the SCHEDULER port, which is WIP:

- WORKS, validated in an Apple `container` Linux VM: 1811 (round-robin) and 1816
  (block_on_fd over the epoll fd path) run identically to macOS kqueue.
- Bug A: a register-indirect trampoline (naked fn + `br x20`, to avoid a per-OS
  hand-written global-asm symbol) bus-errors on the 1817 go/wait/sleep capstone
  on both platforms, though 1811/1816 work — unresolved.
- Bug B: wrapping the original global `asm` trampoline in an `inline if`/`case`
  drops it (nm: fib_tramp U) in sched.sx's context, though every minimal repro
  emits fine — a flatten/lowering interaction in src/imports.zig.

The WIP sched.sx port is preserved both in `git stash` and as
issues/0193-linux-fiber-port.patch. Two resolution paths (either suffices)
documented in the issue. sched.sx itself is left at HEAD (macOS green).

2026-06-26 10:50:50 +03:00

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