Class Thread

kernel/src/process.rs:119–149

Per-thread state Notes: - Box::new(Thread { .. }) first constructs a new Thread on the stack, then moves it onto the heap. Fixed sized arrays therefore can't be used for the new process' stack because they overflow the current stack.

///    therefore can't be used for the new process' stack because they
///    overflow the current stack.
pub struct Thread {
    /// Thread ID
    tid: u64,

    /// Process shared data
    process: Arc<RwLock<Process>>,

    /// Page table physical address
    ///
    /// Note: Functions which manipulate page tables may temporarily
    /// modify their page table. To avoid having to disable
    /// interrupts, each thread's page table is saved and restored
    /// during context switches
    page_table_physaddr: u64,

    /// Kernel stack needed to handle system calls
    /// and interrupts including
    /// save/restore process state in context switch
    kernel_stack: Vec<u8>,

    /// Address of the end of the stack.
    /// This value is put in the Interrupt Stack Table
    kernel_stack_end: u64,

    /// Address of the end of the user stack
    user_stack_end: u64,

    /// Address within the kernel_stack which stores
    /// the Context structure containing thread state.
    context: u64,
}

impl Thread {
    /// Get the Thread ID