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finish hw05 #40

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1 change: 1 addition & 0 deletions .gitignore
Original file line number Diff line number Diff line change
@@ -1,2 +1,3 @@
build
GNUmakefile
.vscode
31 changes: 27 additions & 4 deletions main.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -3,9 +3,12 @@
#include <iostream>
#include <sstream>
#include <cstdlib>
#include <chrono>
#include <string>
#include <thread>
#include <map>
#include <mutex>
#include <shared_mutex>


struct User {
Expand All @@ -15,11 +18,14 @@ struct User {
};

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

// 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) {
// 写锁
std::shared_mutex m_mutx;
std::unique_lock grd(m_mutx);
User user = {password, school, phone};
if (users.emplace(username, user).second)
return "注册成功";
Expand All @@ -29,10 +35,16 @@ std::string do_register(std::string username, std::string password, std::string

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
// 读锁
std::shared_mutex m_rmutx;
std::shared_lock grd(m_rmutx);
// long now = time(NULL); // C 语言当前时间
auto now = std::chrono::steady_clock::now();
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";
auto t2 = std::chrono::steady_clock::now();
auto dt = now - t2; // C 语言算时间差
int64_t sec = std::chrono::duration_cast<std::chrono::milliseconds>(dt).count();
return std::to_string(sec) + "毫秒内登录过";
}
has_login[username] = now;

Expand All @@ -44,6 +56,9 @@ std::string do_login(std::string username, std::string password) {
}

std::string do_queryuser(std::string username) {
// 读锁
std::shared_mutex m_rmutx;
std::shared_lock grd(m_rmutx);
auto &user = users.at(username);
std::stringstream ss;
ss << "用户名: " << username << std::endl;
Expand All @@ -54,10 +69,18 @@ std::string do_queryuser(std::string username) {


struct ThreadPool {
std::vector<std::thread> pool;
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);
pool.push_back(std::move(thr));
}

~ThreadPool() {
for (auto &thr:pool) {
thr.join();
}
}
};

Expand Down