Expand description
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
Structs
a TaskManager global instance through lazy_static!
task context structure containing some registers
The task manager, where all the tasks are managed.
The task manager inner in ‘UPSafeCell’
Functions
Get the current ‘Running’ task’s trap contexts.
Get the current ‘Running’ task’s token.
Exit the current ‘Running’ task and run the next task in task list.
Change the status of current Running task into Exited.
Change the status of current Running task into Ready.
Run the first task in task list.
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 the current ‘Running’ task and run the next task in task list.