Method alloc

os/src/task/id.rs:23–30

(&mut self)

        }
    }
    pub fn alloc(&mut self) -> usize {
        if let Some(id) = self.recycled.pop() {
            id
        } else {
            self.current += 1;
            self.current - 1
        }
    }
    pub fn dealloc(&mut self, id: usize) {
        assert!(id < self.current);
        assert!(