progppy'site

信号

信号的作用 实现inter process communication 的一种方式 区分 信号量(Semaphore) 实现锁 POSIX信号 信号名是信号序号的宏 即 #DEFINE SIGNIT 2 名字会被变成数字 https://man7.org/linux/man-pages/man7/s

Administrator Administrator Published on 2026-01-13

OS Q-A

difference between Ring0-3 to Linux file control access Similarity they record the Privilege/Identity of the subject (who is acting) and the Permissio

Administrator Administrator Published on 2026-01-13

SubArray Sum equals K

547. 省份数量 - 力扣(LeetCode) 图和树的bfs和dfs的区别是: DFS and BFS of map is process of spanning tree, there is not a root But for tree, usual not give us a adjace

Administrator Administrator Published on 2026-01-13

Sql Q180 Consecutive Numbers

Window Function Reference: Window Functions in SQL - GeeksforGeeks talk is cheap, example first Original table Employees Table

Administrator Administrator Published on 2026-01-04

2025回顾

这是我在北邮的第三个年头,但实际上也就过了一年多。 决定先走本科就业路线 学习内容 公开课 cs61a - cs61b开头 Csapp 第一部分 408体系 王道计算机组成原理 过了一遍 汇编语言 王爽 起了个开头 王道数据结构 过了一遍 在学校作业上花了太多时间,有点愚蠢 Java后端 Javas

Administrator Administrator Published on 2026-01-03
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