Added condition variable to sockets unit test

The sockets unit test had the possibility of the client trying to
connect before the server actually has started listening. The condition
variable should ensure this doesn't happen.

tests/sockets.cpp

@@ -9,6 +9,7 @@
 #include <mutex>
 #include <thread>
 #include <string>
+#include <condition_variable>
 
 const unsigned int chunkSize=1024;
 const unsigned int tranCount=768;
@@ -197,8 +198,12 @@ void client()
     serverGroup->wake();
 }
 
+std::condition_variable cv;
+std::mutex cvMutex;
+
 void server()
 {
+    std::unique_lock<std::mutex> cvLock(cvMutex);
     struct Buffer
     {
         std::vector<char> data;
@@ -210,6 +215,8 @@ void server()
     serverGroup = &group;
     if(!group.listen("127.0.0.1", port.c_str()))
         FAIL_LOG("Unable to listen")
+    cv.notify_all();
+    cvLock.unlock();
     std::map<Fastcgipp::Socket, Buffer> buffers;
     std::unique_lock<std::mutex> lock(doneMutex);
     bool flushed;
@@ -342,6 +349,10 @@ int main()
 
     done=false;
     std::thread serverThread(server);
+    {
+        std::unique_lock<std::mutex> cvLock(cvMutex);
+        cv.wait(cvLock);
+    }
     client();
     serverThread.join();