update `process` crate to 2018 edition

crate/process/Cargo.toml

@@ -2,6 +2,7 @@
 name = "ucore-process"
 version = "0.1.0"
 authors = ["WangRunji <wangrunji0408@163.com>"]
+edition = "2018"
 
 [dependencies]
 log = "0.4"

crate/process/src/lib.rs

@@ -1,4 +1,4 @@
-#![no_std]
+#![cfg_attr(not(test), no_std)]
 #![feature(alloc)]
 #![feature(const_fn)]
 #![feature(linkage)]
@@ -6,16 +6,9 @@
 #![feature(vec_resize_default)]
 #![feature(asm)]
 #![feature(exact_size_is_empty)]
+#![feature(extern_crate_item_prelude)]
 
 extern crate alloc;
-#[macro_use]
-extern crate log;
-extern crate spin;
-
-// To use `println!` in test
-#[cfg(test)]
-#[macro_use]
-extern crate std;
 
 mod process_manager;
 mod processor;
@@ -24,5 +17,5 @@ pub mod thread;
 mod event_hub;
 mod interrupt;
 
-pub use process_manager::*;
-pub use processor::Processor;
+pub use crate::process_manager::*;
+pub use crate::processor::Processor;

crate/process/src/process_manager.rs

@@ -1,10 +1,11 @@
 use alloc::boxed::Box;
 use alloc::sync::Arc;
+use alloc::vec::Vec;
 use spin::Mutex;
-use scheduler::Scheduler;
+use log::*;
 use core::cell::UnsafeCell;
-use alloc::vec::Vec;
-use event_hub::EventHub;
+use crate::scheduler::Scheduler;
+use crate::event_hub::EventHub;
 
 struct Process {
     id: Pid,

crate/process/src/processor.rs

@@ -1,9 +1,10 @@
 use alloc::boxed::Box;
 use alloc::sync::Arc;
 use spin::Mutex;
+use log::*;
 use core::cell::UnsafeCell;
-use process_manager::*;
-use interrupt;
+use crate::process_manager::*;
+use crate::interrupt;
 
 /// Process executor
 ///

crate/process/src/scheduler.rs

@@ -1,4 +1,5 @@
 use alloc::{collections::BinaryHeap, vec::Vec};
+use log::*;
 
 type Pid = usize;
 

crate/process/src/thread.rs

@@ -11,9 +11,10 @@ use alloc::collections::BTreeMap;
 use core::marker::PhantomData;
 use core::ptr;
 use core::time::Duration;
-use processor::*;
-use process_manager::*;
-use scheduler::Scheduler;
+use log::*;
+use crate::processor::*;
+use crate::process_manager::*;
+use crate::scheduler::Scheduler;
 
 #[linkage = "weak"]
 #[no_mangle]