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/****************************************************************************
**
** ...
**
** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the tools module of the TQt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free TQt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing retquirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
** included in the packaging of this file. Licensees holding valid TQt
** Commercial licenses may use this file in accordance with the TQt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "qmutexpool_p.h"
#ifdef QT_THREAD_SUPPORT
#include <qthread.h>
Q_EXPORT TQMutexPool *qt_global_mutexpool = 0;
/*!
\class TQMutexPool qmutexpool_p.h
\brief The TQMutexPool class provides a pool of TQMutex objects.
\internal
\ingroup thread
TQMutexPool is a convenience class that provides access to a fixed
number of TQMutex objects.
Typical use of a TQMutexPool is in situations where it is not
possible or feasible to use one TQMutex for every protected object.
The mutex pool will return a mutex based on the address of the
object that needs protection.
For example, consider this simple class:
\code
class Number {
public:
Number( double n ) : num ( n ) { }
void setNumber( double n ) { num = n; }
double number() const { return num; }
private:
double num;
};
\endcode
Adding a TQMutex member to the Number class does not make sense,
because it is so small. However, in order to ensure that access to
each Number is protected, you need to use a mutex. In this case, a
TQMutexPool would be ideal.
Code to calculate the square of a number would then look something
like this:
\code
void calcSquare( Number *num )
{
TQMutexLocker locker( mutexpool.get( num ) );
num.setNumber( num.number() * num.number() );
}
\endcode
This function will safely calculate the square of a number, since
it uses a mutex from a TQMutexPool. The mutex is locked and
unlocked automatically by the TQMutexLocker class. See the
TQMutexLocker documentation for more details.
*/
/*!
Constructs a TQMutexPool, reserving space for \a size TQMutexes. If
\a recursive is TRUE, all TQMutexes in the pool will be recursive
mutexes; otherwise they will all be non-recursive (the default).
The TQMutexes are created when needed, and deleted when the
TQMutexPool is destructed.
*/
TQMutexPool::TQMutexPool( bool recursive, int size )
: mutex( FALSE ), count( size ), recurs( recursive )
{
mutexes = new TQMutex*[count];
for ( int index = 0; index < count; ++index ) {
mutexes[index] = 0;
}
}
/*!
Destructs a TQMutexPool. All TQMutexes that were created by the pool
are deleted.
*/
TQMutexPool::~TQMutexPool()
{
TQMutexLocker locker( &mutex );
for ( int index = 0; index < count; ++index ) {
delete mutexes[index];
mutexes[index] = 0;
}
delete [] mutexes;
mutexes = 0;
}
/*!
Returns a TQMutex from the pool. TQMutexPool uses the value \a
address to determine which mutex is retured from the pool.
*/
TQMutex *TQMutexPool::get( void *address )
{
int index = (int) ( (unsigned long) address % count );
if ( ! mutexes[index] ) {
// mutex not created, create one
TQMutexLocker locker( &mutex );
// we need to check once again that the mutex hasn't been created, since
// 2 threads could be trying to create a mutex as the same index...
if ( ! mutexes[index] ) {
mutexes[index] = new TQMutex( recurs );
}
}
return mutexes[index];
}
#endif
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