tg-rcore-tutorial-user 0.4.10

User-space apps for rCore Tutorial chapters (subset for ch2).
Documentation 
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#![no_std]
#![no_main]

#[macro_use]
extern crate user_lib;
extern crate alloc;

use user_lib::{enable_deadlock_detect, mutex_create, mutex_lock, mutex_unlock};

// 教学目标：
// 同一线程重复加锁同一把阻塞互斥锁，触发死锁检测返回码。
// 理想结果：检测到死锁。

#[unsafe(no_mangle)]
extern "C" fn main() -> i32 {
    enable_deadlock_detect(true);
    let mid = mutex_create(true) as usize;
    assert_eq!(mutex_lock(mid), 0);
    assert_eq!(mutex_lock(mid), -0xdead);
    mutex_unlock(mid);
    println!("deadlock test mutex 1 OK!");
    0
}