From 4acb19a62b1f2415589b4c2d31d8f4f8a959eaf1 Mon Sep 17 00:00:00 2001
From: kyleskyguo <32405872+kyleskyguo@users.noreply.github.com>
Date: Tue, 20 May 2025 09:17:46 +0800
Subject: [PATCH] hw05
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通过利用多线程技术及MUTEX完成安全读写
---
 main.cpp | 94 ++++++++++++++++++++++++++++++++++----------------------
 1 file changed, 58 insertions(+), 36 deletions(-)

diff --git a/main.cpp b/main.cpp
index f4ecab8..1dafed7 100644
--- a/main.cpp
+++ b/main.cpp
@@ -6,44 +6,63 @@
 #include <string>
 #include <thread>
 #include <map>
+#include <mutex>
+#include <chrono>
+#include <future>
+#include <vector>
 
-
-struct User {
+struct User
+{
     std::string password;
     std::string school;
     std::string phone;
 };
 
 std::map<std::string, User> users;
-std::map<std::string, long> has_login;  // 换成 std::chrono::seconds 之类的
+std::map<std::string, std::chrono::steady_clock::time_point> has_login; // 换成 std::chrono::seconds 之类的
+std::mutex users_mtx;
+std::mutex login_mtx;
 
 // 作业要求1：把这些函数变成多线程安全的
 // 提示：能正确利用 shared_mutex 加分，用 lock_guard 系列加分
-std::string do_register(std::string username, std::string password, std::string school, std::string phone) {
+std::string do_register(std::string username, std::string password, std::string school, std::string phone)
+{
     User user = {password, school, phone};
+    std::lock_guard<std::mutex> lock(users_mtx);
     if (users.emplace(username, user).second)
         return "注册成功";
     else
         return "用户名已被注册";
 }
 
-std::string do_login(std::string username, std::string password) {
+std::string do_login(std::string username, std::string password)
+{
     // 作业要求2：把这个登录计时器改成基于 chrono 的
-    long now = time(NULL);   // C 语言当前时间
-    if (has_login.find(username) != has_login.end()) {
-        int sec = now - has_login.at(username);  // C 语言算时间差
-        return std::to_string(sec) + "秒内登录过";
+    // long now = time(NULL); // C 语言当前时间
+    auto now = std::chrono::steady_clock::now();
+    {
+        std::lock_guard<std::mutex> lock(login_mtx);
+        if (has_login.find(username) != has_login.end())
+        {
+            // int sec = now - has_login.at(username); // C 语言算时间差
+            int sec = std::chrono::duration_cast<std::chrono::seconds>(now - has_login.at(username)).count();
+            return std::to_string(sec) + "秒内登录过";
+        }
     }
     has_login[username] = now;
-
-    if (users.find(username) == users.end())
-        return "用户名错误";
-    if (users.at(username).password != password)
-        return "密码错误";
+    {
+        std::lock_guard<std::mutex> lock(users_mtx);
+        if (users.find(username) == users.end())
+            return "用户名错误";
+        if (users.at(username).password != password)
+            return "密码错误";
+    }
     return "登录成功";
 }
 
-std::string do_queryuser(std::string username) {
+std::string do_queryuser(std::string username)
+{
+    std::lock_guard<std::mutex> lock(users_mtx);
     auto &user = users.at(username);
     std::stringstream ss;
     ss << "用户名: " << username << std::endl;
@@ -52,38 +71,41 @@ std::string do_queryuser(std::string username) {
     return ss.str();
 }
 
-
-struct ThreadPool {
-    void create(std::function<void()> start) {
+struct ThreadPool
+{
+    std::vector<std::future<void>> task;
+    void create(std::function<void()> start)
+    {
         // 作业要求3：如何让这个线程保持在后台执行不要退出？
         // 提示：改成 async 和 future 且用法正确也可以加分
-        std::thread thr(start);
+        task.emplace_back(std::async(std::launch::async, std::move(start)));
     }
+    void wait(){for(auto &f:task)f.get();}
 };
 
 ThreadPool tpool;
 
-
-namespace test {  // 测试用例？出水用力！
-std::string username[] = {"张心欣", "王鑫磊", "彭于斌", "胡原名"};
-std::string password[] = {"hellojob", "anti-job42", "cihou233", "reCihou_!"};
-std::string school[] = {"九百八十五大鞋", "浙江大鞋", "剑桥大鞋", "麻绳理工鞋院"};
-std::string phone[] = {"110", "119", "120", "12315"};
+namespace test
+{ // 测试用例？出水用力！
+    std::string username[] = {"张心欣", "王鑫磊", "彭于斌", "胡原名"};
+    std::string password[] = {"hellojob", "anti-job42", "cihou233", "reCihou_!"};
+    std::string school[] = {"九百八十五大鞋", "浙江大鞋", "剑桥大鞋", "麻绳理工鞋院"};
+    std::string phone[] = {"110", "119", "120", "12315"};
 }
 
-int main() {
-    for (int i = 0; i < 262144; i++) {
-        tpool.create([&] {
-            std::cout << do_register(test::username[rand() % 4], test::password[rand() % 4], test::school[rand() % 4], test::phone[rand() % 4]) << std::endl;
-        });
-        tpool.create([&] {
-            std::cout << do_login(test::username[rand() % 4], test::password[rand() % 4]) << std::endl;
-        });
-        tpool.create([&] {
-            std::cout << do_queryuser(test::username[rand() % 4]) << std::endl;
-        });
+int main()
+{
+    for (int i = 0; i < 262144; i++)
+    {
+        tpool.create([&]
+                     { std::cout << do_register(test::username[rand() % 4], test::password[rand() % 4], test::school[rand() % 4], test::phone[rand() % 4]) << std::endl; });
+        tpool.create([&]
+                     { std::cout << do_login(test::username[rand() % 4], test::password[rand() % 4]) << std::endl; });
+        tpool.create([&]
+                     { std::cout << do_queryuser(test::username[rand() % 4]) << std::endl; });
     }
 
     // 作业要求4：等待 tpool 中所有线程都结束后再退出
+    tpool.wait();
     return 0;
 }