/usr/include/zthread/LockedQueue.h is in libzthread-dev 2.3.2-7ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (c) 2005, Eric Crahen
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is furnished
* to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef __ZTLOCKEDQUEUE_H__
#define __ZTLOCKEDQUEUE_H__
#include "zthread/Guard.h"
#include "zthread/Queue.h"
#include <deque>
namespace ZThread {
/**
* @class LockedQueue
* @author Eric Crahen <http://www.code-foo.com>
* @date <2003-07-16T11:42:33-0400>
* @version 2.3.0
*
* A LockedQueue is the simple Queue implementation that provides
* serialized access to the values added to it.
*/
template <class T, class LockType, typename StorageType=std::deque<T> >
class LockedQueue : public Queue<T> {
//! Serialize 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() { }
/**
* @see Queue::add(const T& item)
*/
virtual void add(const T& item) {
Guard<LockType> g(_lock);
if(_canceled)
throw Cancellation_Exception();
_queue.push_back(item);
}
/**
* @see Queue::add(const T& item, unsigned long timeout)
*/
virtual bool add(const T& item, unsigned long timeout) {
try {
Guard<LockType> g(_lock, timeout);
if(_canceled)
throw Cancellation_Exception();
_queue.push_back(item);
} catch(Timeout_Exception&) { return false; }
return true;
}
/**
* @see Queue::next()
*/
virtual T next() {
Guard<LockType> g(_lock);
if(_queue.size() == 0 && _canceled)
throw Cancellation_Exception();
if(_queue.size() == 0)
throw NoSuchElement_Exception();
T item = _queue.front();
_queue.pop_front();
return item;
}
/**
* @see Queue::next(unsigned long timeout)
*/
virtual T next(unsigned long timeout) {
Guard<LockType> g(_lock, timeout);
if(_queue.size() == 0 && _canceled)
throw Cancellation_Exception();
if(_queue.size() == 0)
throw NoSuchElement_Exception();
T item = _queue.front();
_queue.pop_front();
return item;
}
/**
* @see Queue::cancel()
*/
virtual void cancel() {
Guard<LockType> g(_lock);
_canceled = true;
}
/**
* @see Queue::isCanceled()
*/
virtual bool isCanceled() {
// Faster check since the queue will not become un-canceled
if(_canceled)
return true;
Guard<LockType> g(_lock);
return _canceled;
}
/**
* @see Queue::size()
*/
virtual size_t size() {
Guard<LockType> g(_lock);
return _queue.size();
}
/**
* @see Queue::size(unsigned long timeout)
*/
virtual size_t size(unsigned long timeout) {
Guard<LockType> g(_lock, timeout);
return _queue.size();
}
}; /* LockedQueue */
} // namespace ZThread
#endif // __ZTLOCKEDQUEUE_H__
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