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.