Module os::task

Task management implementation

Everything about task management, like starting and switching tasks is implemented here.

A single global instance of TaskManager called TASK_MANAGER controls all the tasks in the operating system.

Be careful when you see __switch. Control flow around this function might not be what you expect.

Modules

context

Implementation of TaskContext

switch

Rust wrapper around __switch.

task

Types related to task management

Structs

TASK_MANAGER

a TaskManager instance through lazy_static!

TaskContext

task context structure containing some registers

TaskControlBlock

task control block structure

TaskManager

The task manager, where all the tasks are managed.

TaskManagerInner

The task manager inner in ‘UPSafeCell’

Enums

TaskStatus

task status: UnInit, Ready, Running, Exited

Functions

__switch^⚠

Switch to the context of next_task_cx_ptr, saving the current context in current_task_cx_ptr.

current_trap_cx

Get the current ‘Running’ task’s trap contexts.

current_user_token

Get the current ‘Running’ task’s token.

exit_current_and_run_next

Exit the current ‘Running’ task and run the next task in task list.

mark_current_exited

Change the status of current Running task into Exited.

mark_current_suspended

Change the status of current Running task into Ready.

run_first_task

Run the first task in task list.

run_next_task

Switch current Running task to the task we have found, or there is no Ready task and we can exit with all applications completed

suspend_current_and_run_next

Suspend the current ‘Running’ task and run the next task in task list.