Update 003_std_atomic_int.cpp

Author: ls-Brynn

cpp_11/003_std_atomic_int.cpp

@@ -1 +1,53 @@
-1
+#include <thread>
+#include <atomic>
+#include <iostream>
+#include <list>
+
+using namespace std;
+
+atomic_int iCount(0);
+
+void threadfun1()
+{
+    for(int i =0; i< 1000; i++)
+    {
+        printf("iCount:%d\r\n",  iCount++);
+    }    
+}
+void threadfun2()
+{
+    for(int i =0; i< 1000; i++)
+    {
+        printf("iCount:%d\r\n",  iCount--);
+    }    
+}
+
+int main()
+{
+    std::list<thread> lstThread;
+    for (int i=0; i< 100; i++)
+    {
+        lstThread.push_back(thread(threadfun1));
+    }
+    for (int i=0; i< 100; i++)
+    {
+        lstThread.push_back(thread(threadfun2));
+    }
+    
+    for (auto& th: lstThread)
+    {
+        th.join();
+    }
+
+    //printf("finally iCount:%d\r\n",  iCount);
+    int x = iCount.load(memory_order_relaxed);
+    printf("finally iCount:%d\r\n",  x);
+}
+
+
+// g++   -std=c++11 -pthread -o out atomictest.cpp && ./out
+iCount:-4
+iCount:-3
+iCount:-2
+iCount:-1
+finally iCount:0