mirror of
https://github.com/hexagonal-sun/moss-kernel.git
synced 2026-04-18 22:28:16 -04:00
35efecad76
This commit refactors the core process representation to decouple
"Identity/Resources" from "Execution/Scheduling". Previously, a
monolithic `Task` struct wrapped in `Arc<SpinLock<>>` caused lock
contention during hot scheduling paths and conflated shared state with
CPU-local state.
The `Task` struct has been split into:
1. `Task` (Shared): Holds process-wide resources (VM, FileTable,
Credentials). Managed via `Arc` and internal fine-grained locking.
2. `OwnedTask` (Private): Holds execution state (Context, v_runtime,
signal mask). Strictly owned by a specific CPU (via the Scheduler) and
accessed lock-free.
Key changes:
* Scheduler:
chedState` now owns tasks via `Box<OwnedTask>`.
- Transitions between `run_queue` and `running_task` involve strictly
moving ownership of the Box, ensuring pointer stability.
- The EEVDF comparison logic now explicitly handles comparisons
between the queued candidates and the currently running task (which is
not in the queue).
* Current Task Access:
- `current()` now returns a `CurrentTaskGuard` which:
1. Disables preemption (preventing context switches while holding
the reference).
2. Performs a runtime borrow check (panic on double-mutable borrow).
3. Dereferences a cached Per-CPU raw pointer for O(1) access.
44 lines
902 B
Rust
44 lines
902 B
Rust
use core::ffi::c_long;
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use core::mem::size_of;
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use crate::sched::current::current_task;
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use libkernel::{
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error::{KernelError, Result},
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memory::address::TUA,
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};
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pub mod futex;
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pub fn sys_set_tid_address(tidptr: TUA<u32>) -> Result<usize> {
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let mut task = current_task();
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task.child_tid_ptr = Some(tidptr);
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Ok(task.tid.value() as _)
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}
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#[repr(C)]
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#[derive(Clone, Copy, Debug)]
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pub struct RobustList {
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next: TUA<RobustList>,
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}
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#[repr(C)]
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#[derive(Clone, Copy, Debug)]
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pub struct RobustListHead {
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list: RobustList,
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futex_offset: c_long,
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list_op_pending: RobustList,
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}
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pub async fn sys_set_robust_list(head: TUA<RobustListHead>, len: usize) -> Result<usize> {
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if core::hint::unlikely(len != size_of::<RobustListHead>()) {
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return Err(KernelError::InvalidValue);
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}
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let mut task = current_task();
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task.robust_list.replace(head);
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Ok(0)
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}
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