Struct os::task::TaskControlBlock

pub struct TaskControlBlock {
    pub pid: PidHandle,
    pub kernel_stack: KernelStack,
    inner: UPSafeCell<TaskControlBlockInner>,
}

Task control block structure

Directly save the contents that will not change during running

Fields

pid: PidHandle

Process identifier

kernel_stack: KernelStack

Kernel stack corresponding to PID

inner: UPSafeCell<TaskControlBlockInner>

Mutable

Implementations

impl TaskControlBlock

pub fn inner_exclusive_access(&self) -> RefMut<'_, TaskControlBlockInner>

Get the mutable reference of the inner TCB

pub fn get_user_token(&self) -> usize

Get the address of app’s page table

impl TaskControlBlock

pub fn new(elf_data: &[u8]) -> Self

Create a new process

At present, it is only used for the creation of initproc

pub fn exec(&self, elf_data: &[u8])

Load a new elf to replace the original application address space and start execution

pub fn fork(self: &Arc<Self>) -> Arc<Self>

parent process fork the child process

pub fn getpid(&self) -> usize

get pid of process

pub fn change_program_brk(&self, size: i32) -> Option<usize>

change the location of the program break. return None if failed.