/usr/include/licq/thread/lockable.h is in licq-dev 1.6.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* This file is part of Licq, an instant messaging client for UNIX.
* Copyright (C) 2009-2010 Licq developers
*
* Licq 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.
*
* Licq 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 Licq; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef LICQ_LOCKABLE_H
#define LICQ_LOCKABLE_H
#include "readwritemutex.h"
#include <pthread.h>
#include <string>
namespace Licq
{
/**
* Interface class for objects that need a public available read write mutex for data access
*/
class Lockable
{
public:
Lockable()
{ /* Empty */ }
/**
* Acquire a read lock
*/
void lockRead() const { myMutex.lockRead(); }
/**
* Release a read lock
*/
void unlockRead() const { myMutex.unlockRead(); }
/**
* Acquire the write lock
*/
void lockWrite() const
{ myMutex.lockWrite(); }
/**
* Release the write lock
*/
void unlockWrite() const
{ myMutex.unlockWrite(); }
protected:
mutable ReadWriteMutex myMutex;
};
/**
* Read guard for mutexes
* Class T should inherit from class Lockable
*/
template <class T> class ReadMutexGuard
{
public:
/**
* Constructor
*
* @param object Object to guard mutex for
* @param locked True if object is already locked or false if guard should lock
*/
ReadMutexGuard(const T* object, bool locked = false)
: myObject(object)
{
if (!locked)
myObject->lockRead();
}
/**
* Copy constructor
* Guarding ownership will be transferred to this guard
*
* @param guard Read guard to get object from
*/
ReadMutexGuard(ReadMutexGuard<T>* guard)
: myObject(guard->myObject)
{
guard->release();
}
/**
* Destructor
* Will unlock mutex if still held
*/
virtual ~ReadMutexGuard()
{
if (myObject != NULL)
unlock();
}
/**
* Unlock the mutex
* Note: This will make the guard forget about the guarded object
*/
void unlock()
{
if (myObject == NULL)
return;
myObject->unlockRead();
myObject = NULL;
}
/**
* Release guard of object without unlocking the mutex
*/
void release()
{
myObject = NULL;
}
/**
* Check if guard is holding a mutex
*
* @return True if guard is active and holds a valid locked object
*/
bool isLocked() const { return myObject != NULL; }
// Access operators
const T* operator*() const { return myObject; }
const T* operator->() const { return myObject; }
private:
// Stop assignment operator from being used by misstake
ReadMutexGuard<T> operator=(const ReadMutexGuard<T>&);
const T* myObject;
};
/**
* Write guard for mutexes
* Class T should inherit from class Lockable
*/
template <class T> class WriteMutexGuard
{
public:
/**
* Constructor
*
* @param object Object to guard mutex for
* @param locked True if object is already locked or false if guard should lock
*/
WriteMutexGuard(T* object, bool locked = false)
: myObject(object)
{
if (!locked)
myObject->lockWrite();
}
/**
* Copy constructor
* Guarding ownership will be transferred to this guard
*
* @param guard Write guard to get object from
*/
WriteMutexGuard(WriteMutexGuard<T>* guard)
: myObject(guard->myObject)
{
guard->release();
}
/**
* Destructor
* Will unlock mutex if still held
*/
virtual ~WriteMutexGuard()
{
if (myObject != NULL)
unlock();
}
/**
* Unlock the mutex
* Note: This will make the guard forget about the guarded object
*/
void unlock()
{
if (myObject == NULL)
return;
myObject->unlockWrite();
myObject = NULL;
}
/**
* Release guard of object without unlocking the mutex
*/
void release()
{
myObject = NULL;
}
/**
* Check if guard is holding a mutex
*
* @return True if guard is active and holds a valid locked object
*/
bool isLocked() const { return myObject != NULL; }
// Access operators
T* operator*() const { return myObject; }
T* operator->() const { return myObject; }
private:
// Stop assignment operator from being used by misstake
WriteMutexGuard<T> operator=(const WriteMutexGuard<T>&);
T* myObject;
};
} // namespace Licq
#endif
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