diff --git a/backend/include/bs-utility.h b/backend/include/bs-utility.h
index 983b647..f08a5cd 100644
--- a/backend/include/bs-utility.h
+++ b/backend/include/bs-utility.h
@@ -1,8 +1,10 @@
 #ifndef PROTECTOR_UTILITY_H
 #define PROTECTOR_UTILITY_H
+#include <atomic>
 #include <chrono>
 #include <condition_variable>
 #include <exception>
+#include <iostream>
 #include <mutex>
 #include <sstream>
 #include <stack>
@@ -69,8 +71,8 @@ class ReadWriteLock {
  private:
   std::mutex mtx;
   std::condition_variable cv;
-  int readers;
-  bool is_writing;
+  std::atomic<int> readers;
+  std::atomic<bool> is_writing;
 
  public:
   ReadWriteLock();
@@ -84,4 +86,15 @@ class SessionClass {
   std::string SessionToken;
   std::string OuthorizationKey;
 };
+namespace BookStore_ZYM {
+extern std::mutex debug_Print_Mutex;
+}
+void debugPrint();
+template <typename... Args>
+void debugPrint(Args... args) {
+  BookStore_ZYM::debug_Print_Mutex.lock();
+  ((std::cerr << args), ...);
+  std::cerr << std::endl;
+  BookStore_ZYM::debug_Print_Mutex.unlock();
+}
 #endif  // PROTECTOR_UTILITY_H
\ No newline at end of file
diff --git a/backend/include/schedule.h b/backend/include/schedule.h
index 48ad0fc..d092084 100644
--- a/backend/include/schedule.h
+++ b/backend/include/schedule.h
@@ -1,6 +1,7 @@
 #ifndef PROTECTOR_SCHEDULE_H
 #define PROTECTOR_SCHEDULE_H
 #include <string>
+#include <unordered_map>
 
 #include "bs-utility.h"
 #include "engine.h"
@@ -9,6 +10,7 @@ class BookStoreBackEndClass {
   BlockingStringStream *input_ptr;
   BlockingStringStream *output_ptr;
   BookStoreEngineClass *engine_ptr;
+  std::unordered_map<std::string, SessionClass> session_map;
 
  public:
   BookStoreBackEndClass() = delete;
diff --git a/backend/src/bs-utility.cpp b/backend/src/bs-utility.cpp
index 359b230..a695521 100644
--- a/backend/src/bs-utility.cpp
+++ b/backend/src/bs-utility.cpp
@@ -24,7 +24,7 @@ void ReadWriteLock::endRead() {
   std::unique_lock<std::mutex> lock(mtx);
   readers--;
   if (readers == 0) {
-    cv.notify_one();  // 唤醒一个等待的写操作
+    cv.notify_all();  // 唤醒一个等待的写操作
   }
 }
 
@@ -40,4 +40,12 @@ void ReadWriteLock::endWrite() {
   std::unique_lock<std::mutex> lock(mtx);
   is_writing = false;
   cv.notify_all();  // 唤醒所有等待的读操作和写操作
+}
+namespace BookStore_ZYM {
+std::mutex debug_Print_Mutex;
+}
+void debugPrint() {
+  BookStore_ZYM::debug_Print_Mutex.lock();
+  std::cerr << std::endl;
+  BookStore_ZYM::debug_Print_Mutex.unlock();
 }
\ No newline at end of file
diff --git a/backend/src/main.cpp b/backend/src/main.cpp
index e97d0f5..58301ae 100644
--- a/backend/src/main.cpp
+++ b/backend/src/main.cpp
@@ -4,30 +4,57 @@
 #include "bs-utility.h"
 #include "builtin-cli.h"
 #include "clipp/clipp.h"
-void test() {
-  BlockingStringStream bss;
+ReadWriteLock rwLock;
+std::mutex mtx;
+void readerFunc(int id) {
+  while (true) {
+    rwLock.startRead();
+    debugPrint("Reader ", id, " is reading.");
+    std::this_thread::sleep_for(std::chrono::milliseconds(498));
+    debugPrint("Reader ", id, " end reading.");
+    rwLock.endRead();
 
-  std::thread reader([&bss]() {
-    std::string data;
-    for (int i = 1; i <= 5; ++i) {
-      // Use getline with string delimiter
-      bss.getline(data, '\n');
-      std::cerr << "Received: " << data << std::endl;
-    }
-  });
-  std::this_thread::sleep_for(std::chrono::seconds(1));
-  std::thread writer([&bss]() {
-    for (int i = 1; i <= 5; ++i) {
-      bss << "Data " << i << '\n';
-      std::this_thread::sleep_for(std::chrono::seconds(1));
-    }
-  });
-  reader.join();
-  writer.join();
+    // 模拟一些其他操作
+    std::this_thread::sleep_for(std::chrono::milliseconds(502));
+  }
+}
+
+void writerFunc(int id) {
+  while (true) {
+    rwLock.startWrite();
+    debugPrint("Writer ", id, " is writing.");
+    std::this_thread::sleep_for(std::chrono::milliseconds(1005));
+    debugPrint("Writer ", id, " end writing.");
+    rwLock.endWrite();
+
+    // 模拟一些其他操作
+    std::this_thread::sleep_for(std::chrono::milliseconds(1013));
+  }
+}
+void test() {
+  std::thread readers[3];
+  std::thread writers[2];
+
+  for (int i = 0; i < 3; ++i) {
+    readers[i] = std::thread(readerFunc, i + 1);
+  }
+
+  for (int i = 0; i < 2; ++i) {
+    writers[i] = std::thread(writerFunc, i + 1);
+  }
+
+  // 等待所有线程结束
+  for (int i = 0; i < 3; ++i) {
+    readers[i].join();
+  }
+
+  for (int i = 0; i < 2; ++i) {
+    writers[i].join();
+  }
 }
 int main(int argc, char **argv) {
-  // test();
-  // return 0;
+  test();
+  return 0;
   bool is_server = false;
   std::string config_dir = "";
   bool custom_config_dir = false;
diff --git a/docs/develop/开发文档.md b/docs/develop/开发文档.md
index 872ab1c..02b4a1c 100644
--- a/docs/develop/开发文档.md
+++ b/docs/develop/开发文档.md
@@ -1,5 +1,5 @@
 ~~未完待续，别扣我分~~
-
+尚未定稿的内容见《总体设计文档》
 **项目名称**：BookStore
 
 **作者**：Zhuang Yumin