Add peeking support to LockedQueue. by XTZGZoReX

--HG--
branch : trunk

src/shared/LockedQueue.h

@@ -42,20 +42,27 @@ namespace ACE_Based
         public:
 
             //! Create a LockedQueue.
-            LockedQueue() : _canceled(false) {}
+            LockedQueue()
+                : _canceled(false)
+            {
+            }
 
             //! Destroy a LockedQueue.
-            virtual ~LockedQueue() { }
+            virtual ~LockedQueue()
+            {
+            }
 
             //! Adds an item to the queue.
             void add(const T& item)
             {
-                ACE_Guard<LockType> g(this->_lock);
+                lock();
 
                 //ASSERT(!this->_canceled);
                 // throw Cancellation_Exception();
 
                 _queue.push_back(item);
+
+                unlock();
             }
 
             //! Gets the next result in the queue, if any.
@@ -74,12 +81,25 @@ namespace ACE_Based
                 return true;
             }
 
+            //! Peeks at the top of the queue. Remember to unlock after use.
+            T& peek()
+            {
+                lock();
+
+
+                T& result = _queue.front();
+
+                return result;
+            }
+
             //! Cancels the queue.
             void cancel()
             {
-                ACE_Guard<LockType> g(this->_lock);
+                lock();
 
                 _canceled = true;
+
+                unlock();
             }
 
             //! Checks if the queue is cancelled.
@@ -88,6 +108,18 @@ namespace ACE_Based
                 ACE_Guard<LockType> g(this->_lock);
                 return _canceled;
             }
+
+            //! Locks the queue for access.
+            void lock()
+            {
+                this->_lock.acquire();
+            }
+
+            //! Unlocks the queue.
+            void unlock()
+            {
+                this->_lock.release();
+            }
     };
 }
 #endif