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40 lines
1.8 KiB
Markdown
40 lines
1.8 KiB
Markdown
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# Stage 29 - Async Exec Dispatch + TTY-Bound Input Ownership
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## Goal
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- Make process launch lifecycle explicit (`pending -> running -> exited`) and tick-driven.
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- Bind user input to the process TTY context to avoid cross-TTY input stealing.
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- Keep kernel shell input compatibility while preparing cleaner multi-TTY user-shell behavior.
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## Implementation
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- Exec lifecycle (Stage 29A):
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- Added process states: `CLKS_EXEC_PROC_PENDING`, `CLKS_EXEC_PROC_RUNNING`, `CLKS_EXEC_PROC_EXITED`.
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- `clks_exec_spawn_path()` now queues process records as pending.
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- Added `clks_exec_tick()` to dispatch pending processes from scheduler tick context.
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- `waitpid` now understands pending/running/exited transitions.
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- TTY ownership (Stage 29B):
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- Added `tty_index` to exec process record and capture active TTY when process is created.
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- Added `clks_exec_current_tty()` to resolve the current execution TTY safely.
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- Refactored keyboard input buffer to per-TTY ring queues.
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- Added `clks_keyboard_pop_char_for_tty()` API.
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- Updated syscall keyboard read path to pop from `clks_exec_current_tty()` queue.
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## Acceptance Criteria
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- `spawn` no longer blocks immediate caller flow and enters pending lifecycle.
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- Tick loop dispatches pending processes without recursive launch storm.
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- Keyboard input on one TTY is not consumed by process context on another TTY.
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- Kernel shell input remains functional through existing `clks_keyboard_pop_char()` API.
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## Build Targets
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- `make userapps`
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- `make ramdisk`
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- `make iso`
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- `make run`
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## QEMU Command
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- `make run`
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## Debug Notes
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- If user shell appears to miss input, log `clks_exec_current_tty()` and active TTY during syscall `KBD_GET_CHAR`.
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- If input is delayed, inspect queue depth via `kbdstat` and verify per-TTY counters move.
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- If `waitpid` stalls forever, check whether `clks_exec_tick()` is called in scheduler/user service tick.
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