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+/*
+ * Copyright (C) 2009 MaNGOS <http://getmangos.com/>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef LOCKEDQUEUE_H
+#define LOCKEDQUEUE_H
+
+#include <ace/Guard_T.h>
+#include <ace/Thread_Mutex.h>
+#include <deque>
+#include <assert.h>
+#include "Errors.h"
+
+namespace ACE_Based
+{
+ template <class T, class LockType, typename StorageType=std::deque<T> >
+ class LockedQueue
+ {
+ //! Lock access to the queue.
+ LockType _lock;
+
+ //! Storage backing the queue.
+ StorageType _queue;
+
+ //! Cancellation flag.
+ volatile bool _canceled;
+
+ public:
+
+ //! Create a LockedQueue.
+ LockedQueue()
+ : _canceled(false)
+ {
+ }
+
+ //! Destroy a LockedQueue.
+ virtual ~LockedQueue()
+ {
+ }
+
+ //! Adds an item to the queue.
+ void add(const T& item)
+ {
+ lock();
+
+ //ASSERT(!this->_canceled);
+ // throw Cancellation_Exception();
+
+ _queue.push_back(item);
+
+ unlock();
+ }
+
+ //! Gets the next result in the queue, if any.
+ bool next(T& result)
+ {
+ // ACE_Guard<LockType> g(this->_lock);
+ ACE_GUARD_RETURN (LockType, g, this->_lock, false);
+
+ if (_queue.empty())
+ return false;
+
+ //ASSERT (!_queue.empty() || !this->_canceled);
+ // throw Cancellation_Exception();
+ result = _queue.front();
+ _queue.pop_front();
+
+ 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()
+ {
+ lock();
+
+ _canceled = true;
+
+ unlock();
+ }
+
+ //! Checks if the queue is cancelled.
+ bool cancelled()
+ {
+ 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();
+ }
+
+ ///! Calls pop_front of the queue
+ void pop_front()
+ {
+ ACE_GUARD (LockType, g, this->_lock);
+ _queue.pop_front();
+ }
+
+ ///! Checks if we're empty or not with locks held
+ bool empty()
+ {
+ ACE_GUARD_RETURN (LockType, g, this->_lock, false);
+ return _queue.empty();
+ }
+ };
+}
+#endif