进程 vs 线程

http://www.ruanyifeng.com/blog/2013/04/processes_and_threads.html
操作系统的设计，因此可以归结为三点：
（1）以多进程形式，允许多个任务同时运行；
（2）以多线程形式，允许单个任务分成不同的部分运行；
（3）提供协调机制，一方面防止进程之间和线程之间产生冲突，另一方面允许进程之间和线程之间共享资源。

Comments

Post a Comment

Popular posts from this blog

Amazon OA 763. Partition Labels

class Solution { public:     vector<int> partitionLabels(string S) {         // 这是个好题         unordered_map<char, int> mp;         vector<int> res;         const int size = S.size();         if(size == 0){             return res;         }         for(int i = 0; i < size; i++){             mp[S[i]] = i;         }         int start = 0, end = 0;         for(int i = 0; i < size; i++){             end = max(end, mp[S[i]]);             if(i == end){                 res.push_back(i - start + 1);                 start = end + 1;     ...
Read more

1427. Split Array into Fibonacci Sequence

Description 中文 English Given a string S of digits, such as S = "123456579", we can split it into a Fibonacci-like sequence [123, 456, 579]. Formally, a Fibonacci-like sequence is a list F of non-negative integers such that: 0 <= F[i] <= 2^31 - 1, (that is, each integer fits a 32-bit signed integer type); F.length >= 3; and F[i] + F[i+1] = F[i+2] for all 0 <= i < F.length - 2. Also, note that when splitting the string into pieces, each piece must not have extra leading zeroes, except if the piece is the number 0 itself. Return any Fibonacci-like sequence split from S, or return [] if it cannot be done. 1 <= S.length <= 200 S contains only digits. Have you met this question in a real interview?    Yes Problem Correction Example Example 1: Input: "123456579" Output: [123,456,579] Example 2: Input: "11235813" Output: [1,1,2,3,5,8,13] Example 3: Input: "112358130" Output: [] Ex...
Read more

LintCode-520. Consistent Hashing II

这题要注意的是用一个map< int, int >来存储id和machine之间的映射关系。注意不能用map< int, vector > 来存储一个machine和一串id，这样就没法找某个id对应哪个machine了。 另外还要 用一个set来存储已经用过的id。 另外再强调map和set的key都是默认从大到小排序的。记得lower_bound()这个函数非常非常有用！map和set都可以用！ class Solution { public:     int n, k;     map<int, int> shards;   //stores id<->machine mapping, multiple ids to one machine     set<int> ids; //stores ids to make sure it is not reused     /*      * @param n: a positive integer      * @param k: a positive integer      * @return: a Solution object      */     static Solution create(int n, int k)  {         Solution sol = Solution();         sol.n = n;         sol.k = k;         return sol;     }     /*      * @param machine_id: An integer   ...
Read more