better interface for critical threaded sections

examples/exThreadPool.cpp

@@ -12,15 +12,15 @@ int main(void)
     {
         pool.addJob([i, &pool](void)
         {
+            pool.critical([i](void)
             {
-                unique_lock<mutex> lock(pool.getMutex());
                 cout << "job " << i << " wait for " << i*100 << " ms" << endl;
-            }
+            });
             this_thread::sleep_for(chrono::milliseconds(i*100));
+            pool.critical([i](void)
             {
-                unique_lock<mutex> lock(pool.getMutex());
                 cout << "job " << i << " done" << endl;
-            }
+            });
         });
     }
     pool.terminate();

lib/Core/ThreadPool.cpp

@@ -92,6 +92,14 @@ void ThreadPool::addJob(Job newJob)
     condition_.notify_one();
 }
 
+// critical section ////////////////////////////////////////////////////////////
+void ThreadPool::critical(Job fn)
+{
+    unique_lock<mutex> lock(mutex_);
+
+    fn();
+}
+
 // wait for completion /////////////////////////////////////////////////////////
 void ThreadPool::terminate(void)
 {

lib/Core/ThreadPool.hpp

@@ -37,6 +37,8 @@ public:
     std::mutex & getMutex(void);
     // add jobs
     void addJob(Job newJob);
+    // critical section
+    void critical(Job fn);
     // wait for completion and terminate
     void terminate(void);
 private: