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 ASM function in switch.S. 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

Global variable: TASK_MANAGER

TaskContext

task context structure containing some registers

TaskControlBlock

The task control block (TCB) of a task.

TaskManager

The task manager, where all the tasks are managed.

TaskManagerInner

Inner of Task Manager

Enums

TaskStatus

The status of a task

Functions

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.