diff --git a/test/src/cpp11/.vscode/settings.json b/test/src/cpp11/.vscode/settings.json
index 9dc95fe..a1b54cd 100644
--- a/test/src/cpp11/.vscode/settings.json
+++ b/test/src/cpp11/.vscode/settings.json
@@ -50,6 +50,8 @@
         "xstring": "cpp",
         "xtr1common": "cpp",
         "xutility": "cpp",
-        "ctime": "cpp"
+        "ctime": "cpp",
+        "threadpool.h": "c",
+        "*.rh": "cpp"
     }
 }
\ No newline at end of file
diff --git a/test/src/cpp11/cpp11_test.cpp b/test/src/cpp11/cpp11_test.cpp
index 4f75b55..d2df55d 100644
--- a/test/src/cpp11/cpp11_test.cpp
+++ b/test/src/cpp11/cpp11_test.cpp
@@ -2,12 +2,12 @@
 using namespace std;
 #include<stdio.h>
 #include "thread_usage.h"
+#include "threadpool.h"
 
 int main(){
     std::cout<<"test start"<<endl;
-    // TestPromiseFutureBefore();
     try{
-        TestThreadDetch(); 
+        TestConditionVariable(); 
     }catch( std::exception  e){
         std::cout<<"exception"<<e.what();
     }
diff --git a/test/src/cpp11/thread_usage.cpp b/test/src/cpp11/thread_usage.cpp
index d389155..75d5ffb 100644
--- a/test/src/cpp11/thread_usage.cpp
+++ b/test/src/cpp11/thread_usage.cpp
@@ -29,7 +29,7 @@ void independentThread()
     std::cout << "Exiting concurrent thread.\n";
 }
 
-void TestThreadDetch() 
+void TestThreadDetach() 
 {
     std::cout << "Starting thread caller.\n";
     std::thread t(independentThread);
@@ -38,4 +38,61 @@ void TestThreadDetch()
     std::cout << "Exiting thread caller.\n";
     std::cout << "done.\n";
 }
+std::mutex gMtx;
 
+void print_even (int x) {
+  if (x%2==0) std::cout << x << " is even\n";
+  else throw (std::logic_error("not even"));
+}
+
+void print_thread_id (int id) {
+  try {
+    // using a local lock_guard to lock mtx guarantees unlocking on destruction / exception:
+    std::lock_guard<std::mutex> lck (gMtx);
+    print_even(id);
+  }
+  catch (std::logic_error& e ) {
+    std::cout << "[exception caught]: ";
+    std::cout<< e.what()<<std::endl;
+  }
+}
+
+void TestLockGuard(){
+    std::thread threads[10];
+    // spawn 10 threads:
+    for (int i=0; i<10; ++i)
+    threads[i] = std::thread(print_thread_id,i+1);
+
+    for (auto& th : threads) th.join();
+
+    return ;
+}
+
+std::mutex cMtx; // 全局互斥锁.
+std::condition_variable gCv; // 全局条件变量.
+bool gReady = false; // 全局标志位.
+void do_print_id(int id){
+    std::unique_lock <std::mutex> lck(cMtx);
+    while (!gReady) // 如果标志位不为 true, 则等待...
+        gCv.wait(lck); // 当前线程被阻塞, 当全局标志位变为 true 之后,
+    // 线程被唤醒, 继续往下执行打印线程编号id.
+    std::cout << "thread " << id << '\n';
+}
+
+void go(){
+    std::unique_lock <std::mutex> lck(cMtx);
+    gReady = true; // 设置全局标志位为 true.
+    gCv.notify_one(); // 唤醒所有线程.
+}
+
+int TestConditionVariable() {
+    std::thread threads[10];
+    // spawn 10 threads:
+    for (int i = 0; i < 10; ++i)
+        threads[i] = std::thread(do_print_id, i);
+    std::cout << "10 threads ready to race...\n";
+    go(); // go!
+    for (auto & th:threads)
+        th.join();
+    return 0;
+}
\ No newline at end of file
diff --git a/test/src/cpp11/thread_usage.h b/test/src/cpp11/thread_usage.h
index df09ac2..8c26287 100644
--- a/test/src/cpp11/thread_usage.h
+++ b/test/src/cpp11/thread_usage.h
@@ -8,4 +8,6 @@
 #include <cstdlib>
 
 void TestPromiseFutureBefore();
-void TestThreadDetch();
\ No newline at end of file
+void TestThreadDetach();
+void TestLockGuard();
+int TestConditionVariable();
\ No newline at end of file
diff --git a/test/src/cpp11/threadpool.c b/test/src/cpp11/threadpool.c
new file mode 100644
index 0000000..e6d861c
--- /dev/null
+++ b/test/src/cpp11/threadpool.c
@@ -0,0 +1,18 @@
+#include "threadpool.h"
+
+int ThreadPool::AddTask(){
+
+}
+
+void ThreadPool::Start(){
+    
+}
+
+void ThreadPool::Stop(){
+    for (auto & th:threads)
+        th.join();
+}
+
+bool ThreadPool::Started(){
+    
+}
\ No newline at end of file
diff --git a/test/src/cpp11/threadpool.cpp b/test/src/cpp11/threadpool.cpp
new file mode 100644
index 0000000..655ef9e
--- /dev/null
+++ b/test/src/cpp11/threadpool.cpp
@@ -0,0 +1 @@
+#include "threadpool.h"
\ No newline at end of file
diff --git a/test/src/cpp11/threadpool.h b/test/src/cpp11/threadpool.h
new file mode 100644
index 0000000..2a33139
--- /dev/null
+++ b/test/src/cpp11/threadpool.h
@@ -0,0 +1,19 @@
+#pragma once
+#include <thread>
+#include <mutex>
+#include <atomic>
+#include <vector>
+
+using namespace std;
+
+typedef class CThreadPool {
+public:
+    CThreadPool(int num);
+    int AddTask();
+    void Start();
+    void Stop();
+    bool Started();
+private:
+    bool mStarted;
+    std::vector<std::thread> mThreads;
+}ThreadPool;
\ No newline at end of file