Module async_io 

Asynchronous I/O subsystem.

Provides shared ring buffers (SQ/CQ) for zero-copy I/O submission and completion between userspace and kernel.

Status

• IMPLEMENTED : ring buffer, dispatch (Nop/VFS/IPC/Storage), AHCI IRQ => CQE bridge. See GitLab issue for details.

TODO

• Read/Write VFS: switch from synchronous (blocking scheme::read) to truly async via the AsyncScheme trait
• Open/Close/Stat: implement dispatch handlers
• IpcCall: implement combined send+recv
• PollAdd/PollRemove: epoll-like support
• Timeout/TimeoutRemove: async timer
• Accept/Connect: async networking
• Cancel: implement actual cancellation of in-flight ops
• Efficient blocking: use ring.wq.wait_until() instead of yield_task() in SYS_ASYNC_ENTER
• Multi-slot AHCI (queue depth > 1 per port)
• Userspace runtime (libasync) + Rust async/await compatibility
• Safety audit (IRQ-safety of SpinLocks, stack overflow)

Tracking : https://git.strat9-os.org/strat9-os/strat9-os/-/issues/53

Modules

complete

Completion routing for async I/O.

dispatch

SQE dispatch : routes submitted SQEs to the appropriate backend.

ops

Asynchronous I/O ABI types : stable across kernel versions.

ring

Ring buffer for async I/O submission and completion.

syscall

Asynchronous I/O syscall handlers.