Method new

os/src/task/process.rs:74–132

(elf_data: &[u8])

    }

    pub fn new(elf_data: &[u8]) -> Arc<Self> {
        // memory_set with elf program headers/trampoline/trap context/user stack
        let (memory_set, ustack_base, entry_point) = MemorySet::from_elf(elf_data);
        // allocate a pid
        let pid_handle = pid_alloc();
        let process = Arc::new(Self {
            pid: pid_handle,
            inner: unsafe {
                UPIntrFreeCell::new(ProcessControlBlockInner {
                    is_zombie: false,
                    memory_set,
                    parent: None,
                    children: Vec::new(),
                    exit_code: 0,
                    fd_table: vec![
                        // 0 -> stdin
                        Some(Arc::new(Stdin)),
                        // 1 -> stdout
                        Some(Arc::new(Stdout)),
                        // 2 -> stderr
                        Some(Arc::new(Stdout)),
                    ],
                    signals: SignalFlags::empty(),
                    tasks: Vec::new(),
                    task_res_allocator: RecycleAllocator::new(),
                    mutex_list: Vec::new(),
                    semaphore_list: Vec::new(),
                    condvar_list: Vec::new(),
                })
            },
        });
        // create a main thread, we should allocate ustack and trap_cx here
        let task = Arc::new(TaskControlBlock::new(
            Arc::clone(&process),
            ustack_base,
            true,
        ));
        // prepare trap_cx of main thread
        let task_inner = task.inner_exclusive_access();
        let trap_cx = task_inner.get_trap_cx();
        let ustack_top = task_inner.res.as_ref().unwrap().ustack_top();
        let kstack_top = task.kstack.get_top();
        drop(task_inner);
        *trap_cx = TrapContext::app_init_context(
            entry_point,
            ustack_top,
            KERNEL_SPACE.exclusive_access().token(),
            kstack_top,
            trap_handler as usize,
        );
        // add main thread to the process
        let mut process_inner = process.inner_exclusive_access();
        process_inner.tasks.push(Some(Arc::clone(&task)));
        drop(process_inner);
        insert_into_pid2process(process.getpid(), Arc::clone(&process));
        // add main thread to scheduler
        add_task(task);
        process