rCore-Tutorial-Guide-2024S/chapter8/5exercise

[utterances-bot]

chapter8 练习 - rCore-Tutorial-Guide-2024S 文档

https://learningos.cn/rCore-Tutorial-Guide-2024S/chapter8/5exercise.html

[OSFantasy]

我感觉那个tips可以再加一句。sys_gettime仍然需要实现。不然ch8_deadlock_sem1过不了。 因为ch8_deadlock_sem1里面89行sleep会用到user_lib里的gettime。

    // ch8_deadlock_sem1.rs
    ...
    for i in 0..THREAD_N {
        tids[i] = thread_create(deadlock_test as usize, 0) as usize;
    }

    sleep(500); // 这里会用到sys_get_time

    for _ in 0..THREAD_N {
        semaphore_up(SEM_BARRIER);
    }
    let mut failed = 0;
    ...

    // lib.rs
    ...
    pub fn sleep(period_ms: usize) {
    let start = get_time();
        while get_time() < start + period_ms as isize {
            sys_yield();
        }
    }
    ...