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Update progress 2021-07-19

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Yifan Wu 2021-07-20 00:12:32 +08:00
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@ -26,17 +26,18 @@ TODO:
Now we are still updating our project, you can find latest changes on branches `chX-dev` such as `ch1-dev`. We are intended to publish first release 3.5.0 after completing most of the tasks mentioned below.
Overall progress: ch4
### Completed
* [x] automatically clean up and rebuild before running our project on a different platform
* [x] fix `power` series application in early chapters, now you can find modulus in the output
* [x] use `UPSafeCell` instead of `RefCell` or `spin::Mutex` in order to access static data structures(now ch4 completed)
* [x] use `UPSafeCell` instead of `RefCell` or `spin::Mutex` in order to access static data structures and adjust its API so that it cannot be borrowed twice at a time(mention `& .exclusive_access().task[0]` in `run_first_task`)
* [x] move `TaskContext` into `TaskControlBlock` instead of restoring it in place on kernel stack(since ch3), eliminating annoying `task_cx_ptr2`
* [x] replace `llvm_asm!` with `asm!`(now ch4 completed)
### Todo(High priority)
* [ ] adjust API of `UPSafeCell` so that it cannot be borrowed twice at a time
* [ ] bug fix: we should call `find_pte` rather than `find_pte_create` in `PageTable::unmap`
* [ ] add a new chapter about synchronization & mutual exclusion(uniprocessor only)
* [ ] give every non-zero process exit code an unique and clear error type