Module os::task

Implementation of process management mechanism

Here is the entry for process scheduling required by other modules (such as syscall or clock interrupt). By suspending or exiting the current process, you can modify the process state, manage the process queue through TASK_MANAGER, and switch the control flow through PROCESSOR.

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

Re-exports

pub use context::TaskContext;

pub use id::kstack_alloc;

pub use id::pid_alloc;

pub use id::KernelStack;

pub use id::PidHandle;

pub use id::IDLE_PID;

pub use manager::add_task;

pub use manager::pid2process;

pub use manager::remove_from_pid2process;

pub use manager::remove_task;

pub use manager::wakeup_task;

pub use processor::current_kstack_top;

pub use processor::current_process;

pub use processor::current_task;

pub use processor::current_trap_cx;

pub use processor::current_trap_cx_user_va;

pub use processor::current_user_token;

pub use processor::run_tasks;

pub use processor::schedule;

pub use processor::take_current_task;

pub use signal::SignalFlags;

pub use task::TaskControlBlock;

pub use task::TaskStatus;

Modules

context 🔒

Implementation of TaskContext

id 🔒

manager 🔒

Implementation of TaskManager

process 🔒

processor 🔒

Implementation of Processor and Intersection of control flow

signal 🔒

switch 🔒

task 🔒

Types related to task management & Functions for completely changing TCB

Structs

INITPROC

Creation of initial process

Functions

add_initproc

Add init process to the manager

block_current_and_run_next

Make current task blocked and switch to the next task

block_current_task

This function must be followed by a schedule

check_signals_of_current

Check if the current task has any signal to handle

current_add_signal

Add signal to the current task

exit_current_and_run_next

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

remove_inactive_task

the inactive(blocked) tasks are removed when the PCB is deallocated.(called by exit_current_and_run_next)

suspend_current_and_run_next

Make current task suspended and switch to the next task