Module os::task::manager

Implementation of TaskManager

It is only used to manage processes and schedule process based on ready queue. Other CPU process monitoring functions are in Processor.

Structs

• PID2PCB
  PID2PCB instance (map of pid to pcb)
• TASK_MANAGER
  TASK_MANAGER instance through lazy_static!
• TaskManager
  A array of TaskControlBlock that is thread-safe

Functions

• add_stopping_task
  Set a task to stop-wait status, waiting for its kernel stack out of use.
• add_task
  Add a task to ready queue
• fetch_task
  Fetch a task out of the ready queue
• insert_into_pid2process
  Insert item(pid, pcb) into PID2PCB map (called by do_fork AND ProcessControlBlock::new)
• pid2process
  Get process by pid
• remove_from_pid2process
  Remove item(pid, _some_pcb) from PDI2PCB map (called by exit_current_and_run_next)
• remove_task
  Remove a task from the ready queue
• wakeup_task
  Wake up a task