Struct os::task::TaskControlBlock

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pub struct TaskControlBlock {
    pub task_cx: TaskContext,
    pub task_status: TaskStatus,
    pub memory_set: MemorySet,
    pub trap_cx_ppn: PhysPageNum,
    pub base_size: usize,
    pub heap_bottom: usize,
    pub program_brk: usize,
}
Expand description

The task control block (TCB) of a task.

Fields§

§task_cx: TaskContext

Save task context

§task_status: TaskStatus

Maintain the execution status of the current process

§memory_set: MemorySet

Application address space

§trap_cx_ppn: PhysPageNum

The phys page number of trap context

§base_size: usize

The size(top addr) of program which is loaded from elf file

§heap_bottom: usize

Heap bottom

§program_brk: usize

Program break

Implementations§

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impl TaskControlBlock

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pub fn get_trap_cx(&self) -> &'static mut TrapContext

get the trap context

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pub fn get_user_token(&self) -> usize

get the user token

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

Based on the elf info in program, build the contents of task in a new address space

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

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

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