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;

use user_lib::{spawn, wait};

const MAX_CHILD: usize = 16;

// 教学目标：
// 批量 spawn 子进程并统一 wait 回收，验证创建与回收数量一致性。

#[unsafe(no_mangle)]
extern "C" fn main() -> i32 {
    for _ in 0..MAX_CHILD {
        let cpid = spawn("ch5_getpid");
        assert!(cpid >= 0, "child pid invalid");
        println!("new child {}", cpid);
    }
    let mut exit_code: i32 = 0;
    for _ in 0..MAX_CHILD {
        assert!(wait(&mut exit_code) > 0, "wait stopped early");
        assert_eq!(exit_code, 0, "error exit code {}", exit_code);
    }
    assert!(wait(&mut exit_code) <= 0, "wait got too many");
    println!("Test spawn0 OK!");
    0
}